linux-kernel - [PATCH 2/2] regulator: Parse ramp_delay in while parsing DT for regulators.

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Date:	Fri,  8 Jun 2012 15:17:31 +0530
From:	Yadwinder Singh Brar <yadi.brar01@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>,
	Yadwinder Singh Brar <yadi.brar@...sung.com>
Subject: [PATCH 2/2] regulator: Parse ramp_delay in while parsing DT for regulators.

For some hardwares ramp_delay for BUCKs is a configurable parameter which can
be configured through DT.This patch adds support for parsing ramp_delay also
while parsing DT for regulators.

Signed-off-by: Yadwinder Singh Brar <yadi.brar@...sung.com>
---
 .../devicetree/bindings/regulator/regulator.txt    |    1 +
 drivers/regulator/of_regulator.c                   |    6 ++++++
 include/linux/regulator/machine.h                  |    2 ++
 3 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index 5b7a408..d0a7b12 100644
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -10,6 +10,7 @@ Optional properties:
 - regulator-always-on: boolean, regulator should never be disabled
 - regulator-boot-on: bootloader/firmware enabled regulator
 - <name>-supply: phandle to the parent supply/regulator node
+- regulator-ramp-delay: ramp delay for regulator(in mV/uS)
 
 Example:
 
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 56593b7..8b9cb53 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -74,6 +74,7 @@ struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
 						struct device_node *node)
 {
 	struct regulator_init_data *init_data;
+	const __be32 *ramp_delay;
 
 	if (!node)
 		return NULL;
@@ -83,6 +84,11 @@ struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
 		return NULL; /* Out of memory? */
 
 	of_get_regulation_constraints(node, &init_data);
+
+	ramp_delay = of_get_property(node, "regulator-ramp_delay", NULL);
+	if (ramp_delay)
+		init_data->ramp_delay = be32_to_cpu(*ramp_delay);
+
 	return init_data;
 }
 EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index b021084..bb29a6b 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -177,6 +177,8 @@ struct regulator_init_data {
 	int num_consumer_supplies;
 	struct regulator_consumer_supply *consumer_supplies;
 
+	int ramp_delay;		/* unit:mV/us */
+
 	/* optional regulator machine specific init */
 	int (*regulator_init)(void *driver_data);
 	void *driver_data;	/* core does not touch this */
-- 
1.7.0.4

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