openwrt/target/linux/at91/patches-5.10/213-ARM-at91-pm-add-sama7g5-ddr-phy-controller.patch

From bbbbf16c44f34a2d563fa7d71de64ffe3b4b82dc Mon Sep 17 00:00:00 2001
From: Claudiu Beznea <claudiu.beznea@microchip.com>
Date: Thu, 15 Apr 2021 13:50:04 +0300
Subject: [PATCH 213/247] ARM: at91: pm: add sama7g5 ddr phy controller

SAMA7G5 self-refresh procedure accesses also the DDR PHY registers.
Adapt the code so that the at91_dt_ramc() to look also for DDR PHYs,
in case it is mandatory.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210415105010.569620-19-claudiu.beznea@microchip.com
---
 arch/arm/mach-at91/pm.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -552,7 +552,12 @@ static const struct of_device_id ramc_id
 	{ /*sentinel*/ }
 };
 
-static __init int at91_dt_ramc(void)
+static const struct of_device_id ramc_phy_ids[] __initconst = {
+	{ .compatible = "microchip,sama7g5-ddr3phy", },
+	{ /* Sentinel. */ },
+};
+
+static __init void at91_dt_ramc(bool phy_mandatory)
 {
 	struct device_node *np;
 	const struct of_device_id *of_id;
@@ -585,6 +590,16 @@ static __init int at91_dt_ramc(void)
 		goto unmap_ramc;
 	}
 
+	/* Lookup for DDR PHY node, if any. */
+	for_each_matching_node_and_match(np, ramc_phy_ids, &of_id) {
+		soc_pm.data.ramc_phy = of_iomap(np, 0);
+		if (!soc_pm.data.ramc_phy)
+			panic(pr_fmt("unable to map ramc phy cpu registers\n"));
+	}
+
+	if (phy_mandatory && !soc_pm.data.ramc_phy)
+		panic(pr_fmt("DDR PHY is mandatory!\n"));
+
 	if (!standby) {
 		pr_warn("ramc no standby function available\n");
 		return 0;
@@ -953,7 +968,7 @@ void __init at91rm9200_pm_init(void)
 	soc_pm.data.standby_mode = AT91_PM_STANDBY;
 	soc_pm.data.suspend_mode = AT91_PM_ULP0;
 
-	ret = at91_dt_ramc();
+	ret = at91_dt_ramc(false);
 	if (ret)
 		return;
 
@@ -980,7 +995,7 @@ void __init sam9x60_pm_init(void)
 
 	at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
 	at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
-	ret = at91_dt_ramc();
+	ret = at91_dt_ramc(false);
 	if (ret)
 		return;
 
@@ -1005,7 +1020,7 @@ void __init at91sam9_pm_init(void)
 	soc_pm.data.standby_mode = AT91_PM_STANDBY;
 	soc_pm.data.suspend_mode = AT91_PM_ULP0;
 
-	ret = at91_dt_ramc();
+	ret = at91_dt_ramc(false);
 	if (ret)
 		return;
 
@@ -1023,7 +1038,7 @@ void __init sama5_pm_init(void)
 		return;
 
 	at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
-	ret = at91_dt_ramc();
+	ret = at91_dt_ramc(false);
 	if (ret)
 		return;
 
@@ -1048,7 +1063,7 @@ void __init sama5d2_pm_init(void)
 
 	at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
 	at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
-	ret = at91_dt_ramc();
+	ret = at91_dt_ramc(false);
 	if (ret)
 		return;