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backlight: lm3630a: Add an enable gpio for the HWEN pin 

For now just enable it in the probe function to allow I2C
access. Disabling also means resetting the register values
to default and according to the datasheet does not give
power savings.

Tested on Kobo Clara HD.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Andreas Kemnade 2019-09-12 23:32:57 +02:00 committed by Lee Jones
parent ae92365cdd
commit 0e0e78e32e
1 changed files with 9 additions and 0 deletions
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9
drivers/video/backlight/lm3630a_bl.c
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@ -12,6 +12,7 @@
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include <linux/pwm.h>
#include <linux/platform_data/lm3630a_bl.h>
@ -48,6 +49,7 @@ struct lm3630a_chip {
struct lm3630a_platform_data *pdata;
struct backlight_device *bleda;
struct backlight_device *bledb;
struct gpio_desc *enable_gpio;
struct regmap *regmap;
struct pwm_device *pwmd;
};
@ -534,6 +536,13 @@ static int lm3630a_probe(struct i2c_client *client,
}
pchip->pdata = pdata;
pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
GPIOD_OUT_HIGH);
if (IS_ERR(pchip->enable_gpio)) {
rval = PTR_ERR(pchip->enable_gpio);
return rval;
}
/* chip initialize */
rval = lm3630a_chip_init(pchip);
if (rval < 0) {