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142 lines
3.9 KiB
Diff
142 lines
3.9 KiB
Diff
From 7f13433e11a3c88f1fd6417c4c5e5a6c98370b9a Mon Sep 17 00:00:00 2001
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From: Claudiu Beznea <claudiu.beznea@microchip.com>
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Date: Fri, 13 Nov 2020 17:21:09 +0200
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Subject: [PATCH 125/247] regulator: mcp16502: add support for ramp delay
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MCP16502 have configurable ramp delay support (via DVSR bits in
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regulators' CFG register).
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Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
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Link: https://lore.kernel.org/r/1605280870-32432-6-git-send-email-claudiu.beznea@microchip.com
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Signed-off-by: Mark Brown <broonie@kernel.org>
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---
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drivers/regulator/mcp16502.c | 89 +++++++++++++++++++++++++++++++++++-
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1 file changed, 87 insertions(+), 2 deletions(-)
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--- a/drivers/regulator/mcp16502.c
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+++ b/drivers/regulator/mcp16502.c
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@@ -22,8 +22,9 @@
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#define VDD_LOW_SEL 0x0D
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#define VDD_HIGH_SEL 0x3F
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-#define MCP16502_FLT BIT(7)
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-#define MCP16502_ENS BIT(0)
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+#define MCP16502_FLT BIT(7)
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+#define MCP16502_DVSR GENMASK(3, 2)
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+#define MCP16502_ENS BIT(0)
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/*
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* The PMIC has four sets of registers corresponding to four power modes:
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@@ -88,6 +89,12 @@ enum mcp16502_reg {
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MCP16502_REG_CFG,
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};
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+/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */
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+static const int mcp16502_ramp_b1l12[] = { 6250, 3125, 2083, 1563 };
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+
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+/* Ramp delay (uV/us) for buck2, buck3, buck4. */
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+static const int mcp16502_ramp_b234[] = { 3125, 1563, 1042, 781 };
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+
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static unsigned int mcp16502_of_map_mode(unsigned int mode)
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{
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if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
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@@ -271,6 +278,80 @@ static int mcp16502_get_status(struct re
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return REGULATOR_STATUS_UNDEFINED;
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}
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+static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev,
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+ unsigned int old_sel,
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+ unsigned int new_sel)
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+{
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+ static const u8 us_ramp[] = { 8, 16, 24, 32 };
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+ int id = rdev_get_id(rdev);
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+ unsigned int uV_delta, val;
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+ int ret;
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+
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+ ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);
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+ if (ret)
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+ return ret;
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+
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+ val = (val & MCP16502_DVSR) >> 2;
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+ uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -
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+ old_sel * rdev->desc->linear_ranges->step);
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+ switch (id) {
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+ case BUCK1:
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+ case LDO1:
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+ case LDO2:
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+ ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
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+ mcp16502_ramp_b1l12[val]);
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+ break;
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+
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+ case BUCK2:
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+ case BUCK3:
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+ case BUCK4:
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+ ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
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+ mcp16502_ramp_b234[val]);
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+ break;
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+
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ return ret;
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+}
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+
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+static int mcp16502_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
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+{
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+ const int *ramp;
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+ int id = rdev_get_id(rdev);
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+ unsigned int i, size;
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+
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+ switch (id) {
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+ case BUCK1:
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+ case LDO1:
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+ case LDO2:
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+ ramp = mcp16502_ramp_b1l12;
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+ size = ARRAY_SIZE(mcp16502_ramp_b1l12);
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+ break;
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+
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+ case BUCK2:
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+ case BUCK3:
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+ case BUCK4:
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+ ramp = mcp16502_ramp_b234;
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+ size = ARRAY_SIZE(mcp16502_ramp_b234);
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+ break;
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+
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ for (i = 0; i < size; i++) {
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+ if (ramp[i] == ramp_delay)
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+ break;
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+ }
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+ if (i == size)
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+ return -EINVAL;
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+
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+ return regmap_update_bits(rdev->regmap, MCP16502_REG_BASE(id, CFG),
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+ MCP16502_DVSR, (i << 2));
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+}
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+
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#ifdef CONFIG_SUSPEND
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/*
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* mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
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@@ -365,6 +446,8 @@ static const struct regulator_ops mcp165
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mcp16502_get_status,
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+ .set_voltage_time_sel = mcp16502_set_voltage_time_sel,
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+ .set_ramp_delay = mcp16502_set_ramp_delay,
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.set_mode = mcp16502_set_mode,
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.get_mode = mcp16502_get_mode,
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@@ -389,6 +472,8 @@ static const struct regulator_ops mcp165
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.get_status = mcp16502_get_status,
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+ .set_voltage_time_sel = mcp16502_set_voltage_time_sel,
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+ .set_ramp_delay = mcp16502_set_ramp_delay,
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#ifdef CONFIG_SUSPEND
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.set_suspend_voltage = mcp16502_set_suspend_voltage,
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