linux-kernel - [PATCH] regulator: arizona-ldo1: Add ramp time for HI

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Message-Id: <1427207276-28038-1-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:	Tue, 24 Mar 2015 14:27:56 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	broonie@...nel.org
Cc:	lgirdwood@...il.com, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com
Subject: [PATCH] regulator: arizona-ldo1: Add ramp time for HI_PWR

From: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>

For regulators that support HI_PWR we need to ensure that switching to
1.8v allows time for the regulator to reach that voltage.

Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/regulator/arizona-ldo1.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/regulator/arizona-ldo1.c b/drivers/regulator/arizona-ldo1.c
index a1d07d3..9474597 100644
--- a/drivers/regulator/arizona-ldo1.c
+++ b/drivers/regulator/arizona-ldo1.c
@@ -113,6 +113,17 @@ static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
 	return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 }
 
+static int arizona_ldo1_hc_set_voltage_time_sel(struct regulator_dev *rdev,
+						unsigned int old_selector,
+						unsigned int new_selector)
+{
+	/* if moving to 1.8v allow time for it to reach voltage */
+	if (new_selector == rdev->desc->n_voltages - 1)
+		return 25;
+	else
+		return 0;
+}
+
 static struct regulator_ops arizona_ldo1_hc_ops = {
 	.list_voltage = arizona_ldo1_hc_list_voltage,
 	.map_voltage = arizona_ldo1_hc_map_voltage,
@@ -120,6 +131,7 @@ static struct regulator_ops arizona_ldo1_hc_ops = {
 	.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 	.get_bypass = regulator_get_bypass_regmap,
 	.set_bypass = regulator_set_bypass_regmap,
+	.set_voltage_time_sel = arizona_ldo1_hc_set_voltage_time_sel,
 };
 
 static const struct regulator_desc arizona_ldo1_hc = {
-- 
1.7.2.5

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