openwrt/target/linux/at91/patches-5.15/100-clk-at91-re-factor-clocks-suspend-resume.patch

From 65bb4687b2a5c6f02f44345540c3389d6e7523e7 Mon Sep 17 00:00:00 2001
From: Claudiu Beznea <claudiu.beznea@microchip.com>
Date: Mon, 11 Oct 2021 14:27:05 +0300
Subject: [PATCH 234/247] clk: at91: re-factor clocks suspend/resume

SAMA5D2 and SAMA7G5 have a special power saving mode (backup mode) where
most of the SoC's components are powered off (including PMC). Resuming
from this mode is done with the help of bootloader. Peripherals are not
aware of the power saving mode thus most of them are disabling clocks in
proper suspend API and re-enable them in resume API without taking into
account the previously setup rate. Moreover some of the peripherals are
acting as wakeup sources and are not disabling the clocks in this
scenario, when suspending. Since backup mode cuts the power for
peripherals, in resume part these clocks needs to be re-configured.

The initial PMC suspend/resume code was designed only for SAMA5D2's PMC
(as it was the only one supporting backup mode). SAMA7G supports also
backup mode and its PMC is different (few new functionalities, different
registers offsets, different offsets in registers for each
functionalities). To address both SAMA5D2 and SAMA7G5 PMC add
.save_context()/.resume_context() support to each clocks driver and call
this from PMC driver.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-2-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
---
 drivers/clk/at91/clk-generated.c    |  46 +++++--
 drivers/clk/at91/clk-main.c         |  66 ++++++++++
 drivers/clk/at91/clk-master.c       | 194 ++++++++++++++++++++++++++--
 drivers/clk/at91/clk-peripheral.c   |  40 +++++-
 drivers/clk/at91/clk-pll.c          |  39 ++++++
 drivers/clk/at91/clk-programmable.c |  29 ++++-
 drivers/clk/at91/clk-sam9x60-pll.c  |  68 +++++++++-
 drivers/clk/at91/clk-system.c       |  20 +++
 drivers/clk/at91/clk-usb.c          |  27 ++++
 drivers/clk/at91/clk-utmi.c         |  39 ++++++
 drivers/clk/at91/pmc.c              | 147 +--------------------
 drivers/clk/at91/pmc.h              |  24 ++--
 12 files changed, 558 insertions(+), 181 deletions(-)

--- a/drivers/clk/at91/clk-generated.c
+++ b/drivers/clk/at91/clk-generated.c
@@ -27,6 +27,7 @@ struct clk_generated {
 	u32 id;
 	u32 gckdiv;
 	const struct clk_pcr_layout *layout;
+	struct at91_clk_pms pms;
 	u8 parent_id;
 	int chg_pid;
 };
@@ -34,25 +35,35 @@ struct clk_generated {
 #define to_clk_generated(hw) \
 	container_of(hw, struct clk_generated, hw)
 
-static int clk_generated_enable(struct clk_hw *hw)
+static int clk_generated_set(struct clk_generated *gck, int status)
 {
-	struct clk_generated *gck = to_clk_generated(hw);
 	unsigned long flags;
-
-	pr_debug("GCLK: %s, gckdiv = %d, parent id = %d\n",
-		 __func__, gck->gckdiv, gck->parent_id);
+	unsigned int enable = status ? AT91_PMC_PCR_GCKEN : 0;
 
 	spin_lock_irqsave(gck->lock, flags);
 	regmap_write(gck->regmap, gck->layout->offset,
 		     (gck->id & gck->layout->pid_mask));
 	regmap_update_bits(gck->regmap, gck->layout->offset,
 			   AT91_PMC_PCR_GCKDIV_MASK | gck->layout->gckcss_mask |
-			   gck->layout->cmd | AT91_PMC_PCR_GCKEN,
+			   gck->layout->cmd | enable,
 			   field_prep(gck->layout->gckcss_mask, gck->parent_id) |
 			   gck->layout->cmd |
 			   FIELD_PREP(AT91_PMC_PCR_GCKDIV_MASK, gck->gckdiv) |
-			   AT91_PMC_PCR_GCKEN);
+			   enable);
 	spin_unlock_irqrestore(gck->lock, flags);
+
+	return 0;
+}
+
+static int clk_generated_enable(struct clk_hw *hw)
+{
+	struct clk_generated *gck = to_clk_generated(hw);
+
+	pr_debug("GCLK: %s, gckdiv = %d, parent id = %d\n",
+		 __func__, gck->gckdiv, gck->parent_id);
+
+	clk_generated_set(gck, 1);
+
 	return 0;
 }
 
@@ -249,6 +260,23 @@ static int clk_generated_set_rate(struct
 	return 0;
 }
 
+static int clk_generated_save_context(struct clk_hw *hw)
+{
+	struct clk_generated *gck = to_clk_generated(hw);
+
+	gck->pms.status = clk_generated_is_enabled(&gck->hw);
+
+	return 0;
+}
+
+static void clk_generated_restore_context(struct clk_hw *hw)
+{
+	struct clk_generated *gck = to_clk_generated(hw);
+
+	if (gck->pms.status)
+		clk_generated_set(gck, gck->pms.status);
+}
+
 static const struct clk_ops generated_ops = {
 	.enable = clk_generated_enable,
 	.disable = clk_generated_disable,
@@ -258,6 +286,8 @@ static const struct clk_ops generated_op
 	.get_parent = clk_generated_get_parent,
 	.set_parent = clk_generated_set_parent,
 	.set_rate = clk_generated_set_rate,
+	.save_context = clk_generated_save_context,
+	.restore_context = clk_generated_restore_context,
 };
 
 /**
@@ -324,8 +354,6 @@ at91_clk_register_generated(struct regma
 	if (ret) {
 		kfree(gck);
 		hw = ERR_PTR(ret);
-	} else {
-		pmc_register_id(id);
 	}
 
 	return hw;
--- a/drivers/clk/at91/clk-main.c
+++ b/drivers/clk/at91/clk-main.c
@@ -28,6 +28,7 @@
 struct clk_main_osc {
 	struct clk_hw hw;
 	struct regmap *regmap;
+	struct at91_clk_pms pms;
 };
 
 #define to_clk_main_osc(hw) container_of(hw, struct clk_main_osc, hw)
@@ -37,6 +38,7 @@ struct clk_main_rc_osc {
 	struct regmap *regmap;
 	unsigned long frequency;
 	unsigned long accuracy;
+	struct at91_clk_pms pms;
 };
 
 #define to_clk_main_rc_osc(hw) container_of(hw, struct clk_main_rc_osc, hw)
@@ -51,6 +53,7 @@ struct clk_rm9200_main {
 struct clk_sam9x5_main {
 	struct clk_hw hw;
 	struct regmap *regmap;
+	struct at91_clk_pms pms;
 	u8 parent;
 };
 
@@ -120,10 +123,29 @@ static int clk_main_osc_is_prepared(stru
 	return (status & AT91_PMC_MOSCS) && clk_main_parent_select(tmp);
 }
 
+static int clk_main_osc_save_context(struct clk_hw *hw)
+{
+	struct clk_main_osc *osc = to_clk_main_osc(hw);
+
+	osc->pms.status = clk_main_osc_is_prepared(hw);
+
+	return 0;
+}
+
+static void clk_main_osc_restore_context(struct clk_hw *hw)
+{
+	struct clk_main_osc *osc = to_clk_main_osc(hw);
+
+	if (osc->pms.status)
+		clk_main_osc_prepare(hw);
+}
+
 static const struct clk_ops main_osc_ops = {
 	.prepare = clk_main_osc_prepare,
 	.unprepare = clk_main_osc_unprepare,
 	.is_prepared = clk_main_osc_is_prepared,
+	.save_context = clk_main_osc_save_context,
+	.restore_context = clk_main_osc_restore_context,
 };
 
 struct clk_hw * __init
@@ -240,12 +262,31 @@ static unsigned long clk_main_rc_osc_rec
 	return osc->accuracy;
 }
 
+static int clk_main_rc_osc_save_context(struct clk_hw *hw)
+{
+	struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
+
+	osc->pms.status = clk_main_rc_osc_is_prepared(hw);
+
+	return 0;
+}
+
+static void clk_main_rc_osc_restore_context(struct clk_hw *hw)
+{
+	struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
+
+	if (osc->pms.status)
+		clk_main_rc_osc_prepare(hw);
+}
+
 static const struct clk_ops main_rc_osc_ops = {
 	.prepare = clk_main_rc_osc_prepare,
 	.unprepare = clk_main_rc_osc_unprepare,
 	.is_prepared = clk_main_rc_osc_is_prepared,
 	.recalc_rate = clk_main_rc_osc_recalc_rate,
 	.recalc_accuracy = clk_main_rc_osc_recalc_accuracy,
+	.save_context = clk_main_rc_osc_save_context,
+	.restore_context = clk_main_rc_osc_restore_context,
 };
 
 struct clk_hw * __init
@@ -465,12 +506,37 @@ static u8 clk_sam9x5_main_get_parent(str
 	return clk_main_parent_select(status);
 }
 
+static int clk_sam9x5_main_save_context(struct clk_hw *hw)
+{
+	struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
+
+	clkmain->pms.status = clk_main_rc_osc_is_prepared(&clkmain->hw);
+	clkmain->pms.parent = clk_sam9x5_main_get_parent(&clkmain->hw);
+
+	return 0;
+}
+
+static void clk_sam9x5_main_restore_context(struct clk_hw *hw)
+{
+	struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
+	int ret;
+
+	ret = clk_sam9x5_main_set_parent(hw, clkmain->pms.parent);
+	if (ret)
+		return;
+
+	if (clkmain->pms.status)
+		clk_sam9x5_main_prepare(hw);
+}
+
 static const struct clk_ops sam9x5_main_ops = {
 	.prepare = clk_sam9x5_main_prepare,
 	.is_prepared = clk_sam9x5_main_is_prepared,
 	.recalc_rate = clk_sam9x5_main_recalc_rate,
 	.set_parent = clk_sam9x5_main_set_parent,
 	.get_parent = clk_sam9x5_main_get_parent,
+	.save_context = clk_sam9x5_main_save_context,
+	.restore_context = clk_sam9x5_main_restore_context,
 };
 
 struct clk_hw * __init
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -37,6 +37,7 @@ struct clk_master {
 	spinlock_t *lock;
 	const struct clk_master_layout *layout;
 	const struct clk_master_characteristics *characteristics;
+	struct at91_clk_pms pms;
 	u32 *mux_table;
 	u32 mckr;
 	int chg_pid;
@@ -112,10 +113,52 @@ static unsigned long clk_master_div_reca
 	return rate;
 }
 
+static int clk_master_div_save_context(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+	struct clk_hw *parent_hw = clk_hw_get_parent(hw);
+	unsigned long flags;
+	unsigned int mckr, div;
+
+	spin_lock_irqsave(master->lock, flags);
+	regmap_read(master->regmap, master->layout->offset, &mckr);
+	spin_unlock_irqrestore(master->lock, flags);
+
+	mckr &= master->layout->mask;
+	div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
+	div = master->characteristics->divisors[div];
+
+	master->pms.parent_rate = clk_hw_get_rate(parent_hw);
+	master->pms.rate = DIV_ROUND_CLOSEST(master->pms.parent_rate, div);
+
+	return 0;
+}
+
+static void clk_master_div_restore_context(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+	unsigned long flags;
+	unsigned int mckr;
+	u8 div;
+
+	spin_lock_irqsave(master->lock, flags);
+	regmap_read(master->regmap, master->layout->offset, &mckr);
+	spin_unlock_irqrestore(master->lock, flags);
+
+	mckr &= master->layout->mask;
+	div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
+	div = master->characteristics->divisors[div];
+
+	if (div != DIV_ROUND_CLOSEST(master->pms.parent_rate, master->pms.rate))
+		pr_warn("MCKR DIV not configured properly by firmware!\n");
+}
+
 static const struct clk_ops master_div_ops = {
 	.prepare = clk_master_prepare,
 	.is_prepared = clk_master_is_prepared,
 	.recalc_rate = clk_master_div_recalc_rate,
+	.save_context = clk_master_div_save_context,
+	.restore_context = clk_master_div_restore_context,
 };
 
 static int clk_master_div_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -125,7 +168,9 @@ static int clk_master_div_set_rate(struc
 	const struct clk_master_characteristics *characteristics =
 						master->characteristics;
 	unsigned long flags;
+	unsigned int mckr, tmp;
 	int div, i;
+	int ret;
 
 	div = DIV_ROUND_CLOSEST(parent_rate, rate);
 	if (div > ARRAY_SIZE(characteristics->divisors))
@@ -145,11 +190,24 @@ static int clk_master_div_set_rate(struc
 		return -EINVAL;
 
 	spin_lock_irqsave(master->lock, flags);
-	regmap_update_bits(master->regmap, master->layout->offset,
-			   (MASTER_DIV_MASK << MASTER_DIV_SHIFT),
-			   (div << MASTER_DIV_SHIFT));
+	ret = regmap_read(master->regmap, master->layout->offset, &mckr);
+	if (ret)
+		goto unlock;
+
+	tmp = mckr & master->layout->mask;
+	tmp = (tmp >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
+	if (tmp == div)
+		goto unlock;
+
+	mckr &= ~(MASTER_DIV_MASK << MASTER_DIV_SHIFT);
+	mckr |= (div << MASTER_DIV_SHIFT);
+	ret = regmap_write(master->regmap, master->layout->offset, mckr);
+	if (ret)
+		goto unlock;
+
 	while (!clk_master_ready(master))
 		cpu_relax();
+unlock:
 	spin_unlock_irqrestore(master->lock, flags);
 
 	return 0;
@@ -197,12 +255,25 @@ static int clk_master_div_determine_rate
 	return 0;
 }
 
+static void clk_master_div_restore_context_chg(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+	int ret;
+
+	ret = clk_master_div_set_rate(hw, master->pms.rate,
+				      master->pms.parent_rate);
+	if (ret)
+		pr_warn("Failed to restore MCK DIV clock\n");
+}
+
 static const struct clk_ops master_div_ops_chg = {
 	.prepare = clk_master_prepare,
 	.is_prepared = clk_master_is_prepared,
 	.recalc_rate = clk_master_div_recalc_rate,
 	.determine_rate = clk_master_div_determine_rate,
 	.set_rate = clk_master_div_set_rate,
+	.save_context = clk_master_div_save_context,
+	.restore_context = clk_master_div_restore_context_chg,
 };
 
 static void clk_sama7g5_master_best_diff(struct clk_rate_request *req,
@@ -272,7 +343,8 @@ static int clk_master_pres_set_rate(stru
 {
 	struct clk_master *master = to_clk_master(hw);
 	unsigned long flags;
-	unsigned int pres;
+	unsigned int pres, mckr, tmp;
+	int ret;
 
 	pres = DIV_ROUND_CLOSEST(parent_rate, rate);
 	if (pres > MASTER_PRES_MAX)
@@ -284,15 +356,27 @@ static int clk_master_pres_set_rate(stru
 		pres = ffs(pres) - 1;
 
 	spin_lock_irqsave(master->lock, flags);
-	regmap_update_bits(master->regmap, master->layout->offset,
-			   (MASTER_PRES_MASK << master->layout->pres_shift),
-			   (pres << master->layout->pres_shift));
+	ret = regmap_read(master->regmap, master->layout->offset, &mckr);
+	if (ret)
+		goto unlock;
+
+	mckr &= master->layout->mask;
+	tmp = (mckr >> master->layout->pres_shift) & MASTER_PRES_MASK;
+	if (pres == tmp)
+		goto unlock;
+
+	mckr &= ~(MASTER_PRES_MASK << master->layout->pres_shift);
+	mckr |= (pres << master->layout->pres_shift);
+	ret = regmap_write(master->regmap, master->layout->offset, mckr);
+	if (ret)
+		goto unlock;
 
 	while (!clk_master_ready(master))
 		cpu_relax();
+unlock:
 	spin_unlock_irqrestore(master->lock, flags);
 
-	return 0;
+	return ret;
 }
 
 static unsigned long clk_master_pres_recalc_rate(struct clk_hw *hw,
@@ -330,11 +414,68 @@ static u8 clk_master_pres_get_parent(str
 	return mckr & AT91_PMC_CSS;
 }
 
+static int clk_master_pres_save_context(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+	struct clk_hw *parent_hw = clk_hw_get_parent(hw);
+	unsigned long flags;
+	unsigned int val, pres;
+
+	spin_lock_irqsave(master->lock, flags);
+	regmap_read(master->regmap, master->layout->offset, &val);
+	spin_unlock_irqrestore(master->lock, flags);
+
+	val &= master->layout->mask;
+	pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
+	if (pres == MASTER_PRES_MAX && master->characteristics->have_div3_pres)
+		pres = 3;
+	else
+		pres = (1 << pres);
+
+	master->pms.parent = val & AT91_PMC_CSS;
+	master->pms.parent_rate = clk_hw_get_rate(parent_hw);
+	master->pms.rate = DIV_ROUND_CLOSEST_ULL(master->pms.parent_rate, pres);
+
+	return 0;
+}
+
+static void clk_master_pres_restore_context(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+	unsigned long flags;
+	unsigned int val, pres;
+
+	spin_lock_irqsave(master->lock, flags);
+	regmap_read(master->regmap, master->layout->offset, &val);
+	spin_unlock_irqrestore(master->lock, flags);
+
+	val &= master->layout->mask;
+	pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
+	if (pres == MASTER_PRES_MAX && master->characteristics->have_div3_pres)
+		pres = 3;
+	else
+		pres = (1 << pres);
+
+	if (master->pms.rate !=
+	    DIV_ROUND_CLOSEST_ULL(master->pms.parent_rate, pres) ||
+	    (master->pms.parent != (val & AT91_PMC_CSS)))
+		pr_warn("MCKR PRES was not configured properly by firmware!\n");
+}
+
+static void clk_master_pres_restore_context_chg(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+
+	clk_master_pres_set_rate(hw, master->pms.rate, master->pms.parent_rate);
+}
+
 static const struct clk_ops master_pres_ops = {
 	.prepare = clk_master_prepare,
 	.is_prepared = clk_master_is_prepared,
 	.recalc_rate = clk_master_pres_recalc_rate,
 	.get_parent = clk_master_pres_get_parent,
+	.save_context = clk_master_pres_save_context,
+	.restore_context = clk_master_pres_restore_context,
 };
 
 static const struct clk_ops master_pres_ops_chg = {
@@ -344,6 +485,8 @@ static const struct clk_ops master_pres_
 	.recalc_rate = clk_master_pres_recalc_rate,
 	.get_parent = clk_master_pres_get_parent,
 	.set_rate = clk_master_pres_set_rate,
+	.save_context = clk_master_pres_save_context,
+	.restore_context = clk_master_pres_restore_context_chg,
 };
 
 static struct clk_hw * __init
@@ -539,20 +682,21 @@ static int clk_sama7g5_master_set_parent
 	return 0;
 }
 
-static int clk_sama7g5_master_enable(struct clk_hw *hw)
+static void clk_sama7g5_master_set(struct clk_master *master,
+				   unsigned int status)
 {
-	struct clk_master *master = to_clk_master(hw);
 	unsigned long flags;
 	unsigned int val, cparent;
+	unsigned int enable = status ? PMC_MCR_EN : 0;
 
 	spin_lock_irqsave(master->lock, flags);
 
 	regmap_write(master->regmap, PMC_MCR, PMC_MCR_ID(master->id));
 	regmap_read(master->regmap, PMC_MCR, &val);
 	regmap_update_bits(master->regmap, PMC_MCR,
-			   PMC_MCR_EN | PMC_MCR_CSS | PMC_MCR_DIV |
+			   enable | PMC_MCR_CSS | PMC_MCR_DIV |
 			   PMC_MCR_CMD | PMC_MCR_ID_MSK,
-			   PMC_MCR_EN | (master->parent << PMC_MCR_CSS_SHIFT) |
+			   enable | (master->parent << PMC_MCR_CSS_SHIFT) |
 			   (master->div << MASTER_DIV_SHIFT) |
 			   PMC_MCR_CMD | PMC_MCR_ID(master->id));
 
@@ -563,6 +707,13 @@ static int clk_sama7g5_master_enable(str
 		cpu_relax();
 
 	spin_unlock_irqrestore(master->lock, flags);
+}
+
+static int clk_sama7g5_master_enable(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+
+	clk_sama7g5_master_set(master, 1);
 
 	return 0;
 }
@@ -620,6 +771,23 @@ static int clk_sama7g5_master_set_rate(s
 	return 0;
 }
 
+static int clk_sama7g5_master_save_context(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+
+	master->pms.status = clk_sama7g5_master_is_enabled(hw);
+
+	return 0;
+}
+
+static void clk_sama7g5_master_restore_context(struct clk_hw *hw)
+{
+	struct clk_master *master = to_clk_master(hw);
+
+	if (master->pms.status)
+		clk_sama7g5_master_set(master, master->pms.status);
+}
+
 static const struct clk_ops sama7g5_master_ops = {
 	.enable = clk_sama7g5_master_enable,
 	.disable = clk_sama7g5_master_disable,
@@ -629,6 +797,8 @@ static const struct clk_ops sama7g5_mast
 	.set_rate = clk_sama7g5_master_set_rate,
 	.get_parent = clk_sama7g5_master_get_parent,
 	.set_parent = clk_sama7g5_master_set_parent,
+	.save_context = clk_sama7g5_master_save_context,
+	.restore_context = clk_sama7g5_master_restore_context,
 };
 
 struct clk_hw * __init
--- a/drivers/clk/at91/clk-peripheral.c
+++ b/drivers/clk/at91/clk-peripheral.c
@@ -37,6 +37,7 @@ struct clk_sam9x5_peripheral {
 	u32 id;
 	u32 div;
 	const struct clk_pcr_layout *layout;
+	struct at91_clk_pms pms;
 	bool auto_div;
 	int chg_pid;
 };
@@ -155,10 +156,11 @@ static void clk_sam9x5_peripheral_autodi
 	periph->div = shift;
 }
 
-static int clk_sam9x5_peripheral_enable(struct clk_hw *hw)
+static int clk_sam9x5_peripheral_set(struct clk_sam9x5_peripheral *periph,
+				     unsigned int status)
 {
-	struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
 	unsigned long flags;
+	unsigned int enable = status ? AT91_PMC_PCR_EN : 0;
 
 	if (periph->id < PERIPHERAL_ID_MIN)
 		return 0;
@@ -168,15 +170,21 @@ static int clk_sam9x5_peripheral_enable(
 		     (periph->id & periph->layout->pid_mask));
 	regmap_update_bits(periph->regmap, periph->layout->offset,
 			   periph->layout->div_mask | periph->layout->cmd |
-			   AT91_PMC_PCR_EN,
+			   enable,
 			   field_prep(periph->layout->div_mask, periph->div) |
-			   periph->layout->cmd |
-			   AT91_PMC_PCR_EN);
+			   periph->layout->cmd | enable);
 	spin_unlock_irqrestore(periph->lock, flags);
 
 	return 0;
 }
 
+static int clk_sam9x5_peripheral_enable(struct clk_hw *hw)
+{
+	struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
+
+	return clk_sam9x5_peripheral_set(periph, 1);
+}
+
 static void clk_sam9x5_peripheral_disable(struct clk_hw *hw)
 {
 	struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
@@ -393,6 +401,23 @@ static int clk_sam9x5_peripheral_set_rat
 	return -EINVAL;
 }
 
+static int clk_sam9x5_peripheral_save_context(struct clk_hw *hw)
+{
+	struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
+
+	periph->pms.status = clk_sam9x5_peripheral_is_enabled(hw);
+
+	return 0;
+}
+
+static void clk_sam9x5_peripheral_restore_context(struct clk_hw *hw)
+{
+	struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
+
+	if (periph->pms.status)
+		clk_sam9x5_peripheral_set(periph, periph->pms.status);
+}
+
 static const struct clk_ops sam9x5_peripheral_ops = {
 	.enable = clk_sam9x5_peripheral_enable,
 	.disable = clk_sam9x5_peripheral_disable,
@@ -400,6 +425,8 @@ static const struct clk_ops sam9x5_perip
 	.recalc_rate = clk_sam9x5_peripheral_recalc_rate,
 	.round_rate = clk_sam9x5_peripheral_round_rate,
 	.set_rate = clk_sam9x5_peripheral_set_rate,
+	.save_context = clk_sam9x5_peripheral_save_context,
+	.restore_context = clk_sam9x5_peripheral_restore_context,
 };
 
 static const struct clk_ops sam9x5_peripheral_chg_ops = {
@@ -409,6 +436,8 @@ static const struct clk_ops sam9x5_perip
 	.recalc_rate = clk_sam9x5_peripheral_recalc_rate,
 	.determine_rate = clk_sam9x5_peripheral_determine_rate,
 	.set_rate = clk_sam9x5_peripheral_set_rate,
+	.save_context = clk_sam9x5_peripheral_save_context,
+	.restore_context = clk_sam9x5_peripheral_restore_context,
 };
 
 struct clk_hw * __init
@@ -460,7 +489,6 @@ at91_clk_register_sam9x5_peripheral(stru
 		hw = ERR_PTR(ret);
 	} else {
 		clk_sam9x5_peripheral_autodiv(periph);
-		pmc_register_id(id);
 	}
 
 	return hw;
--- a/drivers/clk/at91/clk-pll.c
+++ b/drivers/clk/at91/clk-pll.c
@@ -40,6 +40,7 @@ struct clk_pll {
 	u16 mul;
 	const struct clk_pll_layout *layout;
 	const struct clk_pll_characteristics *characteristics;
+	struct at91_clk_pms pms;
 };
 
 static inline bool clk_pll_ready(struct regmap *regmap, int id)
@@ -260,6 +261,42 @@ static int clk_pll_set_rate(struct clk_h
 	return 0;
 }
 
+static int clk_pll_save_context(struct clk_hw *hw)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	struct clk_hw *parent_hw = clk_hw_get_parent(hw);
+
+	pll->pms.parent_rate = clk_hw_get_rate(parent_hw);
+	pll->pms.rate = clk_pll_recalc_rate(&pll->hw, pll->pms.parent_rate);
+	pll->pms.status = clk_pll_ready(pll->regmap, PLL_REG(pll->id));
+
+	return 0;
+}
+
+static void clk_pll_restore_context(struct clk_hw *hw)
+{
+	struct clk_pll *pll = to_clk_pll(hw);
+	unsigned long calc_rate;
+	unsigned int pllr, pllr_out, pllr_count;
+	u8 out = 0;
+
+	if (pll->characteristics->out)
+		out = pll->characteristics->out[pll->range];
+
+	regmap_read(pll->regmap, PLL_REG(pll->id), &pllr);
+
+	calc_rate = (pll->pms.parent_rate / PLL_DIV(pllr)) *
+		     (PLL_MUL(pllr, pll->layout) + 1);
+	pllr_count = (pllr >> PLL_COUNT_SHIFT) & PLL_MAX_COUNT;
+	pllr_out = (pllr >> PLL_OUT_SHIFT) & out;
+
+	if (pll->pms.rate != calc_rate ||
+	    pll->pms.status != clk_pll_ready(pll->regmap, PLL_REG(pll->id)) ||
+	    pllr_count != PLL_MAX_COUNT ||
+	    (out && pllr_out != out))
+		pr_warn("PLLAR was not configured properly by firmware\n");
+}
+
 static const struct clk_ops pll_ops = {
 	.prepare = clk_pll_prepare,
 	.unprepare = clk_pll_unprepare,
@@ -267,6 +304,8 @@ static const struct clk_ops pll_ops = {
 	.recalc_rate = clk_pll_recalc_rate,
 	.round_rate = clk_pll_round_rate,
 	.set_rate = clk_pll_set_rate,
+	.save_context = clk_pll_save_context,
+	.restore_context = clk_pll_restore_context,
 };
 
 struct clk_hw * __init
--- a/drivers/clk/at91/clk-programmable.c
+++ b/drivers/clk/at91/clk-programmable.c
@@ -24,6 +24,7 @@ struct clk_programmable {
 	u32 *mux_table;
 	u8 id;
 	const struct clk_programmable_layout *layout;
+	struct at91_clk_pms pms;
 };
 
 #define to_clk_programmable(hw) container_of(hw, struct clk_programmable, hw)
@@ -177,12 +178,38 @@ static int clk_programmable_set_rate(str
 	return 0;
 }
 
+static int clk_programmable_save_context(struct clk_hw *hw)
+{
+	struct clk_programmable *prog = to_clk_programmable(hw);
+	struct clk_hw *parent_hw = clk_hw_get_parent(hw);
+
+	prog->pms.parent = clk_programmable_get_parent(hw);
+	prog->pms.parent_rate = clk_hw_get_rate(parent_hw);
+	prog->pms.rate = clk_programmable_recalc_rate(hw, prog->pms.parent_rate);
+
+	return 0;
+}
+
+static void clk_programmable_restore_context(struct clk_hw *hw)
+{
+	struct clk_programmable *prog = to_clk_programmable(hw);
+	int ret;
+
+	ret = clk_programmable_set_parent(hw, prog->pms.parent);
+	if (ret)
+		return;
+
+	clk_programmable_set_rate(hw, prog->pms.rate, prog->pms.parent_rate);
+}
+
 static const struct clk_ops programmable_ops = {
 	.recalc_rate = clk_programmable_recalc_rate,
 	.determine_rate = clk_programmable_determine_rate,
 	.get_parent = clk_programmable_get_parent,
 	.set_parent = clk_programmable_set_parent,
 	.set_rate = clk_programmable_set_rate,
+	.save_context = clk_programmable_save_context,
+	.restore_context = clk_programmable_restore_context,
 };
 
 struct clk_hw * __init
@@ -221,8 +248,6 @@ at91_clk_register_programmable(struct re
 	if (ret) {
 		kfree(prog);
 		hw = ERR_PTR(ret);
-	} else {
-		pmc_register_pck(id);
 	}
 
 	return hw;
--- a/drivers/clk/at91/clk-sam9x60-pll.c
+++ b/drivers/clk/at91/clk-sam9x60-pll.c
@@ -38,12 +38,14 @@ struct sam9x60_pll_core {
 
 struct sam9x60_frac {
 	struct sam9x60_pll_core core;
+	struct at91_clk_pms pms;
 	u32 frac;
 	u16 mul;
 };
 
 struct sam9x60_div {
 	struct sam9x60_pll_core core;
+	struct at91_clk_pms pms;
 	u8 div;
 };
 
@@ -75,9 +77,8 @@ static unsigned long sam9x60_frac_pll_re
 		DIV_ROUND_CLOSEST_ULL((u64)parent_rate * frac->frac, (1 << 22));
 }
 
-static int sam9x60_frac_pll_prepare(struct clk_hw *hw)
+static int sam9x60_frac_pll_set(struct sam9x60_pll_core *core)
 {
-	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
 	struct sam9x60_frac *frac = to_sam9x60_frac(core);
 	struct regmap *regmap = core->regmap;
 	unsigned int val, cfrac, cmul;
@@ -141,6 +142,13 @@ unlock:
 	return 0;
 }
 
+static int sam9x60_frac_pll_prepare(struct clk_hw *hw)
+{
+	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
+
+	return sam9x60_frac_pll_set(core);
+}
+
 static void sam9x60_frac_pll_unprepare(struct clk_hw *hw)
 {
 	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
@@ -280,6 +288,25 @@ unlock:
 	return ret;
 }
 
+static int sam9x60_frac_pll_save_context(struct clk_hw *hw)
+{
+	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
+	struct sam9x60_frac *frac = to_sam9x60_frac(core);
+
+	frac->pms.status = sam9x60_pll_ready(core->regmap, core->id);
+
+	return 0;
+}
+
+static void sam9x60_frac_pll_restore_context(struct clk_hw *hw)
+{
+	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
+	struct sam9x60_frac *frac = to_sam9x60_frac(core);
+
+	if (frac->pms.status)
+		sam9x60_frac_pll_set(core);
+}
+
 static const struct clk_ops sam9x60_frac_pll_ops = {
 	.prepare = sam9x60_frac_pll_prepare,
 	.unprepare = sam9x60_frac_pll_unprepare,
@@ -287,6 +314,8 @@ static const struct clk_ops sam9x60_frac
 	.recalc_rate = sam9x60_frac_pll_recalc_rate,
 	.round_rate = sam9x60_frac_pll_round_rate,
 	.set_rate = sam9x60_frac_pll_set_rate,
+	.save_context = sam9x60_frac_pll_save_context,
+	.restore_context = sam9x60_frac_pll_restore_context,
 };
 
 static const struct clk_ops sam9x60_frac_pll_ops_chg = {
@@ -296,11 +325,12 @@ static const struct clk_ops sam9x60_frac
 	.recalc_rate = sam9x60_frac_pll_recalc_rate,
 	.round_rate = sam9x60_frac_pll_round_rate,
 	.set_rate = sam9x60_frac_pll_set_rate_chg,
+	.save_context = sam9x60_frac_pll_save_context,
+	.restore_context = sam9x60_frac_pll_restore_context,
 };
 
-static int sam9x60_div_pll_prepare(struct clk_hw *hw)
+static int sam9x60_div_pll_set(struct sam9x60_pll_core *core)
 {
-	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
 	struct sam9x60_div *div = to_sam9x60_div(core);
 	struct regmap *regmap = core->regmap;
 	unsigned long flags;
@@ -334,6 +364,13 @@ unlock:
 	return 0;
 }
 
+static int sam9x60_div_pll_prepare(struct clk_hw *hw)
+{
+	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
+
+	return sam9x60_div_pll_set(core);
+}
+
 static void sam9x60_div_pll_unprepare(struct clk_hw *hw)
 {
 	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
@@ -482,6 +519,25 @@ unlock:
 	return 0;
 }
 
+static int sam9x60_div_pll_save_context(struct clk_hw *hw)
+{
+	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
+	struct sam9x60_div *div = to_sam9x60_div(core);
+
+	div->pms.status = sam9x60_div_pll_is_prepared(hw);
+
+	return 0;
+}
+
+static void sam9x60_div_pll_restore_context(struct clk_hw *hw)
+{
+	struct sam9x60_pll_core *core = to_sam9x60_pll_core(hw);
+	struct sam9x60_div *div = to_sam9x60_div(core);
+
+	if (div->pms.status)
+		sam9x60_div_pll_set(core);
+}
+
 static const struct clk_ops sam9x60_div_pll_ops = {
 	.prepare = sam9x60_div_pll_prepare,
 	.unprepare = sam9x60_div_pll_unprepare,
@@ -489,6 +545,8 @@ static const struct clk_ops sam9x60_div_
 	.recalc_rate = sam9x60_div_pll_recalc_rate,
 	.round_rate = sam9x60_div_pll_round_rate,
 	.set_rate = sam9x60_div_pll_set_rate,
+	.save_context = sam9x60_div_pll_save_context,
+	.restore_context = sam9x60_div_pll_restore_context,
 };
 
 static const struct clk_ops sam9x60_div_pll_ops_chg = {
@@ -498,6 +556,8 @@ static const struct clk_ops sam9x60_div_
 	.recalc_rate = sam9x60_div_pll_recalc_rate,
 	.round_rate = sam9x60_div_pll_round_rate,
 	.set_rate = sam9x60_div_pll_set_rate_chg,
+	.save_context = sam9x60_div_pll_save_context,
+	.restore_context = sam9x60_div_pll_restore_context,
 };
 
 struct clk_hw * __init
--- a/drivers/clk/at91/clk-system.c
+++ b/drivers/clk/at91/clk-system.c
@@ -20,6 +20,7 @@
 struct clk_system {
 	struct clk_hw hw;
 	struct regmap *regmap;
+	struct at91_clk_pms pms;
 	u8 id;
 };
 
@@ -77,10 +78,29 @@ static int clk_system_is_prepared(struct
 	return !!(status & (1 << sys->id));
 }
 
+static int clk_system_save_context(struct clk_hw *hw)
+{
+	struct clk_system *sys = to_clk_system(hw);
+
+	sys->pms.status = clk_system_is_prepared(hw);
+
+	return 0;
+}
+
+static void clk_system_restore_context(struct clk_hw *hw)
+{
+	struct clk_system *sys = to_clk_system(hw);
+
+	if (sys->pms.status)
+		clk_system_prepare(&sys->hw);
+}
+
 static const struct clk_ops system_ops = {
 	.prepare = clk_system_prepare,
 	.unprepare = clk_system_unprepare,
 	.is_prepared = clk_system_is_prepared,
+	.save_context = clk_system_save_context,
+	.restore_context = clk_system_restore_context,
 };
 
 struct clk_hw * __init
--- a/drivers/clk/at91/clk-usb.c
+++ b/drivers/clk/at91/clk-usb.c
@@ -24,6 +24,7 @@
 struct at91sam9x5_clk_usb {
 	struct clk_hw hw;
 	struct regmap *regmap;
+	struct at91_clk_pms pms;
 	u32 usbs_mask;
 	u8 num_parents;
 };
@@ -148,12 +149,38 @@ static int at91sam9x5_clk_usb_set_rate(s
 	return 0;
 }
 
+static int at91sam9x5_usb_save_context(struct clk_hw *hw)
+{
+	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+	struct clk_hw *parent_hw = clk_hw_get_parent(hw);
+
+	usb->pms.parent = at91sam9x5_clk_usb_get_parent(hw);
+	usb->pms.parent_rate = clk_hw_get_rate(parent_hw);
+	usb->pms.rate = at91sam9x5_clk_usb_recalc_rate(hw, usb->pms.parent_rate);
+
+	return 0;
+}
+
+static void at91sam9x5_usb_restore_context(struct clk_hw *hw)
+{
+	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
+	int ret;
+
+	ret = at91sam9x5_clk_usb_set_parent(hw, usb->pms.parent);
+	if (ret)
+		return;
+
+	at91sam9x5_clk_usb_set_rate(hw, usb->pms.rate, usb->pms.parent_rate);
+}
+
 static const struct clk_ops at91sam9x5_usb_ops = {
 	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
 	.determine_rate = at91sam9x5_clk_usb_determine_rate,
 	.get_parent = at91sam9x5_clk_usb_get_parent,
 	.set_parent = at91sam9x5_clk_usb_set_parent,
 	.set_rate = at91sam9x5_clk_usb_set_rate,
+	.save_context = at91sam9x5_usb_save_context,
+	.restore_context = at91sam9x5_usb_restore_context,
 };
 
 static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
--- a/drivers/clk/at91/clk-utmi.c
+++ b/drivers/clk/at91/clk-utmi.c
@@ -23,6 +23,7 @@ struct clk_utmi {
 	struct clk_hw hw;
 	struct regmap *regmap_pmc;
 	struct regmap *regmap_sfr;
+	struct at91_clk_pms pms;
 };
 
 #define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
@@ -113,11 +114,30 @@ static unsigned long clk_utmi_recalc_rat
 	return UTMI_RATE;
 }
 
+static int clk_utmi_save_context(struct clk_hw *hw)
+{
+	struct clk_utmi *utmi = to_clk_utmi(hw);
+
+	utmi->pms.status = clk_utmi_is_prepared(hw);
+
+	return 0;
+}
+
+static void clk_utmi_restore_context(struct clk_hw *hw)
+{
+	struct clk_utmi *utmi = to_clk_utmi(hw);
+
+	if (utmi->pms.status)
+		clk_utmi_prepare(hw);
+}
+
 static const struct clk_ops utmi_ops = {
 	.prepare = clk_utmi_prepare,
 	.unprepare = clk_utmi_unprepare,
 	.is_prepared = clk_utmi_is_prepared,
 	.recalc_rate = clk_utmi_recalc_rate,
+	.save_context = clk_utmi_save_context,
+	.restore_context = clk_utmi_restore_context,
 };
 
 static struct clk_hw * __init
@@ -232,10 +252,29 @@ static int clk_utmi_sama7g5_is_prepared(
 	return 0;
 }
 
+static int clk_utmi_sama7g5_save_context(struct clk_hw *hw)
+{
+	struct clk_utmi *utmi = to_clk_utmi(hw);
+
+	utmi->pms.status = clk_utmi_sama7g5_is_prepared(hw);
+
+	return 0;
+}
+
+static void clk_utmi_sama7g5_restore_context(struct clk_hw *hw)
+{
+	struct clk_utmi *utmi = to_clk_utmi(hw);
+
+	if (utmi->pms.status)
+		clk_utmi_sama7g5_prepare(hw);
+}
+
 static const struct clk_ops sama7g5_utmi_ops = {
 	.prepare = clk_utmi_sama7g5_prepare,
 	.is_prepared = clk_utmi_sama7g5_is_prepared,
 	.recalc_rate = clk_utmi_recalc_rate,
+	.save_context = clk_utmi_sama7g5_save_context,
+	.restore_context = clk_utmi_sama7g5_restore_context,
 };
 
 struct clk_hw * __init
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -3,6 +3,7 @@
  *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
  */
 
+#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
@@ -14,8 +15,6 @@
 
 #include <asm/proc-fns.h>
 
-#include <dt-bindings/clock/at91.h>
-
 #include "pmc.h"
 
 #define PMC_MAX_IDS 128
@@ -111,147 +110,19 @@ struct pmc_data *pmc_data_allocate(unsig
 }
 
 #ifdef CONFIG_PM
-static struct regmap *pmcreg;
-
-static u8 registered_ids[PMC_MAX_IDS];
-static u8 registered_pcks[PMC_MAX_PCKS];
-
-static struct
-{
-	u32 scsr;
-	u32 pcsr0;
-	u32 uckr;
-	u32 mor;
-	u32 mcfr;
-	u32 pllar;
-	u32 mckr;
-	u32 usb;
-	u32 imr;
-	u32 pcsr1;
-	u32 pcr[PMC_MAX_IDS];
-	u32 audio_pll0;
-	u32 audio_pll1;
-	u32 pckr[PMC_MAX_PCKS];
-} pmc_cache;
-
-/*
- * As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored
- * without alteration in the table, and 0 is for unused clocks.
- */
-void pmc_register_id(u8 id)
+static int at91_pmc_suspend(void)
 {
-	int i;
-
-	for (i = 0; i < PMC_MAX_IDS; i++) {
-		if (registered_ids[i] == 0) {
-			registered_ids[i] = id;
-			break;
-		}
-		if (registered_ids[i] == id)
-			break;
-	}
+	return clk_save_context();
 }
 
-/*
- * As Programmable Clock 0 is valid on AT91 chips, there is an offset
- * of 1 between the stored value and the real clock ID.
- */
-void pmc_register_pck(u8 pck)
+static void at91_pmc_resume(void)
 {
-	int i;
-
-	for (i = 0; i < PMC_MAX_PCKS; i++) {
-		if (registered_pcks[i] == 0) {
-			registered_pcks[i] = pck + 1;
-			break;
-		}
-		if (registered_pcks[i] == (pck + 1))
-			break;
-	}
-}
-
-static int pmc_suspend(void)
-{
-	int i;
-	u8 num;
-
-	regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
-	regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
-	regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
-	regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
-	regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr);
-	regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar);
-	regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr);
-	regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb);
-	regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr);
-	regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1);
-
-	for (i = 0; registered_ids[i]; i++) {
-		regmap_write(pmcreg, AT91_PMC_PCR,
-			     (registered_ids[i] & AT91_PMC_PCR_PID_MASK));
-		regmap_read(pmcreg, AT91_PMC_PCR,
-			    &pmc_cache.pcr[registered_ids[i]]);
-	}
-	for (i = 0; registered_pcks[i]; i++) {
-		num = registered_pcks[i] - 1;
-		regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]);
-	}
-
-	return 0;
-}
-
-static bool pmc_ready(unsigned int mask)
-{
-	unsigned int status;
-
-	regmap_read(pmcreg, AT91_PMC_SR, &status);
-
-	return ((status & mask) == mask) ? 1 : 0;
-}
-
-static void pmc_resume(void)
-{
-	int i;
-	u8 num;
-	u32 tmp;
-	u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;
-
-	regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
-	if (pmc_cache.mckr != tmp)
-		pr_warn("MCKR was not configured properly by the firmware\n");
-	regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp);
-	if (pmc_cache.pllar != tmp)
-		pr_warn("PLLAR was not configured properly by the firmware\n");
-
-	regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
-	regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
-	regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
-	regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
-	regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr);
-	regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb);
-	regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr);
-	regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1);
-
-	for (i = 0; registered_ids[i]; i++) {
-		regmap_write(pmcreg, AT91_PMC_PCR,
-			     pmc_cache.pcr[registered_ids[i]] |
-			     AT91_PMC_PCR_CMD);
-	}
-	for (i = 0; registered_pcks[i]; i++) {
-		num = registered_pcks[i] - 1;
-		regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]);
-	}
-
-	if (pmc_cache.uckr & AT91_PMC_UPLLEN)
-		mask |= AT91_PMC_LOCKU;
-
-	while (!pmc_ready(mask))
-		cpu_relax();
+	clk_restore_context();
 }
 
 static struct syscore_ops pmc_syscore_ops = {
-	.suspend = pmc_suspend,
-	.resume = pmc_resume,
+	.suspend = at91_pmc_suspend,
+	.resume = at91_pmc_resume,
 };
 
 static const struct of_device_id sama5d2_pmc_dt_ids[] = {
@@ -271,11 +142,7 @@ static int __init pmc_register_ops(void)
 		of_node_put(np);
 		return -ENODEV;
 	}
-
-	pmcreg = device_node_to_regmap(np);
 	of_node_put(np);
-	if (IS_ERR(pmcreg))
-		return PTR_ERR(pmcreg);
 
 	register_syscore_ops(&pmc_syscore_ops);
 
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -13,6 +13,8 @@
 #include <linux/regmap.h>
 #include <linux/spinlock.h>
 
+#include <dt-bindings/clock/at91.h>
+
 extern spinlock_t pmc_pcr_lock;
 
 struct pmc_data {
@@ -98,6 +100,20 @@ struct clk_pcr_layout {
 	u32 pid_mask;
 };
 
+/**
+ * struct at91_clk_pms - Power management state for AT91 clock
+ * @rate: clock rate
+ * @parent_rate: clock parent rate
+ * @status: clock status (enabled or disabled)
+ * @parent: clock parent index
+ */
+struct at91_clk_pms {
+	unsigned long rate;
+	unsigned long parent_rate;
+	unsigned int status;
+	unsigned int parent;
+};
+
 #define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
 #define field_prep(_mask, _val) (((_val) << (ffs(_mask) - 1)) & (_mask))
 
@@ -248,12 +264,4 @@ struct clk_hw * __init
 at91_clk_sama7g5_register_utmi(struct regmap *regmap, const char *name,
 			       const char *parent_name);
 
-#ifdef CONFIG_PM
-void pmc_register_id(u8 id);
-void pmc_register_pck(u8 pck);
-#else
-static inline void pmc_register_id(u8 id) {}
-static inline void pmc_register_pck(u8 pck) {}
-#endif
-
 #endif /* __PMC_H_ */