diff mbox series

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

Message ID 20200810152219.6254-3-biju.das.jz@bp.renesas.com (mailing list archive)
State Superseded
Delegated to: Kieran Bingham
Headers show
Series Add optional regulator support for LVDS codec. | expand

Commit Message

Biju Das Aug. 10, 2020, 3:22 p.m. UTC 
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(+)

Comments

Laurent Pinchart Aug. 11, 2020, 10:59 a.m. UTC | #1 
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)) {
Biju Das Aug. 11, 2020, 11:03 a.m. UTC | #2 
Hi Laurent,

Thanks for the feedback.

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

Yes, I am ok with that.

Cheers,
Biju


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


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diff mbox series

Patch

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;
 
 	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)) {