Hi Thierry & David,

May I ask you please your feedback on this small patch?
Many thanks,

Philippe :-)

On 02/05/2018 10:45 AM, Philippe Cornu wrote:
> Add support for the optional power-supply.
> 
> Note: A "dummy regulator" is returned by devm_regulator_get()
> if the optional regulator is not present in the device tree,
> simplifying the source code when enabling/disabling the regulator.
> 
> Signed-off-by: Philippe Cornu <philippe.co...@st.com>
> ---
>   drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c 
> b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> index 72530983d55d..90f1ae4af93c 100644
> --- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> +++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> @@ -11,6 +11,7 @@
>   #include <drm/drm_panel.h>
>   #include <linux/backlight.h>
>   #include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
>   #include <video/mipi_display.h>
>   
>   #define DRV_NAME "orisetech_otm8009a"
> @@ -62,6 +63,7 @@ struct otm8009a {
>       struct drm_panel panel;
>       struct backlight_device *bl_dev;
>       struct gpio_desc *reset_gpio;
> +     struct regulator *supply;
>       bool prepared;
>       bool enabled;
>   };
> @@ -279,6 +281,8 @@ static int otm8009a_unprepare(struct drm_panel *panel)
>               msleep(20);
>       }
>   
> +     regulator_disable(ctx->supply);
> +
>       ctx->prepared = false;
>   
>       return 0;
> @@ -292,6 +296,12 @@ static int otm8009a_prepare(struct drm_panel *panel)
>       if (ctx->prepared)
>               return 0;
>   
> +     ret = regulator_enable(ctx->supply);
> +     if (ret < 0) {
> +             DRM_ERROR("failed to enable supply: %d\n", ret);
> +             return ret;
> +     }
> +
>       if (ctx->reset_gpio) {
>               gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>               gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> @@ -414,6 +424,13 @@ static int otm8009a_probe(struct mipi_dsi_device *dsi)
>               return PTR_ERR(ctx->reset_gpio);
>       }
>   
> +     ctx->supply = devm_regulator_get(dev, "power");
> +     if (IS_ERR(ctx->supply)) {
> +             ret = PTR_ERR(ctx->supply);
> +             dev_err(dev, "failed to request regulator: %d\n", ret);
> +             return ret;
> +     }
> +
>       mipi_dsi_set_drvdata(dsi, ctx);
>   
>       ctx->dev = dev;
> 

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