On Wed, Sep 11, 2019 at 07:21:06PM +0200, Andreas Kemnade wrote:
> 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 <andr...@kemnade.info>
Make sure Dan is happy w.r.t. his review comments but if this driver is
unchanged when you spin v4 (for the DT changes) then feel free to add:
Reviewed-by: Daniel Thompson <daniel.thomp...@linaro.org>
Daniel.
> ---
> changes in v2:
> - simplification
> - correct gpio direction initialisation
>
> changes in v3:
> - removed legacy include
>
> drivers/video/backlight/lm3630a_bl.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/video/backlight/lm3630a_bl.c
> b/drivers/video/backlight/lm3630a_bl.c
> index 8f84f3684f04..d9e67b9b2571 100644
> --- a/drivers/video/backlight/lm3630a_bl.c
> +++ b/drivers/video/backlight/lm3630a_bl.c
> @@ -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;
> };
> @@ -535,6 +537,13 @@ 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) {
> --
> 2.20.1
>
