Re: [PATCH v2 2/3] drm/bridge: lvds-codec: Add support for regulator

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Biju,

Thank you for the patch.

On Mon, Aug 10, 2020 at 04:22:18PM +0100, Biju Das wrote:
> Add the support for enabling optional regulator that may be used as VCC
> source.
> 
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> New Patch Ref: Ref:https://patchwork.kernel.org/patch/11705819/
> ---
>  drivers/gpu/drm/bridge/lvds-codec.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/lvds-codec.c b/drivers/gpu/drm/bridge/lvds-codec.c
> index 24fb1befdfa2..5858a29aafe6 100644
> --- a/drivers/gpu/drm/bridge/lvds-codec.c
> +++ b/drivers/gpu/drm/bridge/lvds-codec.c
> @@ -10,13 +10,16 @@
>  #include <linux/of_device.h>
>  #include <linux/of_graph.h>
>  #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <drm/drm_bridge.h>
>  #include <drm/drm_panel.h>
>  
>  struct lvds_codec {
> +	struct device *dev;
>  	struct drm_bridge bridge;
>  	struct drm_bridge *panel_bridge;
> +	struct regulator *vcc;
>  	struct gpio_desc *powerdown_gpio;
>  	u32 connector_type;
>  };
> @@ -38,6 +41,14 @@ static int lvds_codec_attach(struct drm_bridge *bridge,
>  static void lvds_codec_enable(struct drm_bridge *bridge)
>  {
>  	struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
> +	int ret;
> +
> +	ret = regulator_enable(lvds_codec->vcc);
> +	if (ret) {
> +		dev_err(lvds_codec->dev,
> +			"Failed to enable regulator \"vcc\": %d\n", ret);
> +		return;
> +	}
>  
>  	if (lvds_codec->powerdown_gpio)
>  		gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
> @@ -46,9 +57,15 @@ static void lvds_codec_enable(struct drm_bridge *bridge)
>  static void lvds_codec_disable(struct drm_bridge *bridge)
>  {
>  	struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
> +	int ret;
>  
>  	if (lvds_codec->powerdown_gpio)
>  		gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
> +
> +	ret = regulator_disable(lvds_codec->vcc);
> +	if (ret)
> +		dev_err(lvds_codec->dev,
> +			"Failed to disable regulator \"vcc\": %d\n", ret);
>  }
>  
>  static const struct drm_bridge_funcs funcs = {
> @@ -63,12 +80,24 @@ static int lvds_codec_probe(struct platform_device *pdev)
>  	struct device_node *panel_node;
>  	struct drm_panel *panel;
>  	struct lvds_codec *lvds_codec;
> +	int error;

The driver tends to use "ret" for error status variables. If you're fine
with this change there's no need to resubmit the patch, I can fix when
applying.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>  
>  	lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
>  	if (!lvds_codec)
>  		return -ENOMEM;
>  
> +	lvds_codec->dev = &pdev->dev;
>  	lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
> +
> +	lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "vcc");
> +	if (IS_ERR(lvds_codec->vcc)) {
> +		error = PTR_ERR(lvds_codec->vcc);
> +		if (error != -EPROBE_DEFER)
> +			dev_err(lvds_codec->dev,
> +				"Unable to get \"vcc\" supply: %d\n", error);
> +		return error;
> +	}
> +
>  	lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
>  							     GPIOD_OUT_HIGH);
>  	if (IS_ERR(lvds_codec->powerdown_gpio)) {

-- 
Regards,

Laurent Pinchart
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