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.cornu@xxxxxx>
> ---
> 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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