linux-kernel - [PATCH v2] backlight: lp855x: use private data for regulator control

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Date:	Fri, 10 Jul 2015 17:26:38 +0900
From:	Milo Kim <milo.kim@...com>
To:	<jingoohan1@...il.com>, <lee.jones@...aro.org>
CC:	Milo Kim <milo.kim@...com>, Sean Paul <seanpaul@...omium.org>,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2] backlight: lp855x: use private data for regulator control

LP855x backlight device can be enabled by external VDD input.
The 'supply' data is used for this purpose.
It's kind of private data which runs internally, so there is no reason to
expose to the platform data.

And devm_regulator_get() is moved from _parse_dt() to _probe().
Regulator consumer(lp855x) can control regulator not only from DT but also
from platform data configuration in a source file such like board-*.c.

If 'power' regulator driver is not ready, lp855x should continue to work
because the power supply control is optional. So -EPROBE_DEFER return code
is removed.

v1->v2:
  Keeps optional property '<name>-supply' in LP855x DT binding.

Cc: Sean Paul <seanpaul@...omium.org>
Cc: Jingoo Han <jingoohan1@...il.com>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Milo Kim <milo.kim@...com>
---
 drivers/video/backlight/lp855x_bl.c  | 20 +++++++++-----------
 include/linux/platform_data/lp855x.h |  2 --
 2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index a26d3bb..277d5ca 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -73,6 +73,7 @@ struct lp855x {
 	struct device *dev;
 	struct lp855x_platform_data *pdata;
 	struct pwm_device *pwm;
+	struct regulator *supply;	/* regulator for VDD input */
 };
 
 static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)
@@ -384,13 +385,6 @@ static int lp855x_parse_dt(struct lp855x *lp)
 		pdata->rom_data = &rom[0];
 	}
 
-	pdata->supply = devm_regulator_get(dev, "power");
-	if (IS_ERR(pdata->supply)) {
-		if (PTR_ERR(pdata->supply) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		pdata->supply = NULL;
-	}
-
 	lp->pdata = pdata;
 
 	return 0;
@@ -431,8 +425,12 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 	else
 		lp->mode = REGISTER_BASED;
 
-	if (lp->pdata->supply) {
-		ret = regulator_enable(lp->pdata->supply);
+	lp->supply = devm_regulator_get(lp->dev, "power");
+	if (IS_ERR(lp->supply))
+		lp->supply = NULL;
+
+	if (lp->supply) {
+		ret = regulator_enable(lp->supply);
 		if (ret < 0) {
 			dev_err(&cl->dev, "failed to enable supply: %d\n", ret);
 			return ret;
@@ -470,8 +468,8 @@ static int lp855x_remove(struct i2c_client *cl)
 
 	lp->bl->props.brightness = 0;
 	backlight_update_status(lp->bl);
-	if (lp->pdata->supply)
-		regulator_disable(lp->pdata->supply);
+	if (lp->supply)
+		regulator_disable(lp->supply);
 	sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);
 
 	return 0;
diff --git a/include/linux/platform_data/lp855x.h b/include/linux/platform_data/lp855x.h
index 9c7fd1e..1b2ba24 100644
--- a/include/linux/platform_data/lp855x.h
+++ b/include/linux/platform_data/lp855x.h
@@ -136,7 +136,6 @@ struct lp855x_rom_data {
 		Only valid when mode is PWM_BASED.
  * @size_program : total size of lp855x_rom_data
  * @rom_data : list of new eeprom/eprom registers
- * @supply : regulator that supplies 3V input
  */
 struct lp855x_platform_data {
 	const char *name;
@@ -145,7 +144,6 @@ struct lp855x_platform_data {
 	unsigned int period_ns;
 	int size_program;
 	struct lp855x_rom_data *rom_data;
-	struct regulator *supply;
 };
 
 #endif
-- 
1.9.1

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