[PATCH v3] drm/bridge: lvds-codec: Add support for regulator

[Biju Das]

Hi Sam,

> Subject: Re: [PATCH v3] drm/bridge: lvds-codec: Add support for regulator
> 
> Hi Biju, Laurent
> 
> On Tue, Sep 22, 2020 at 01:55:26PM +0300, Laurent Pinchart wrote:
> > From: Biju Das <biju.das.jz at bp.renesas.com>
> >
> > Add the support for enabling optional regulator that may be used as
> > VCC source.
> >
> > Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > [Replaced 'error' variable with 'ret'] [Renamed regulator from 'vcc'
> > to 'power']
> > Signed-off-by: Laurent Pinchart
> > <laurent.pinchart+renesas at ideasonboard.com>
> 
> Applied to drm-misc-next.
> Biju, could you make a follow-up patch that introduces dev_err_probe()
> where appropriate? I did not fix up the code but this was a good candidate.

Ok, sure will do.

Thanks,
Biju
> 
> 	Sam
> 
> > ---
> > Changes since v2:
> >
> > - Use the correct regulator name
> > ---
> >  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 f19d9f7a5db2..f52ccffc1bd1 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 ret;
> >
> >  	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, "power");
> > +	if (IS_ERR(lvds_codec->vcc)) {
> > +		ret = PTR_ERR(lvds_codec->vcc);
> > +		if (ret != -EPROBE_DEFER)
> > +			dev_err(lvds_codec->dev,
> > +				"Unable to get \"vcc\" supply: %d\n", ret);
> > +		return ret;
> > +	}
> > +
> >  	lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev,
> "powerdown",
> >
> GPIOD_OUT_HIGH);
> >  	if (IS_ERR(lvds_codec->powerdown_gpio))
> > --
> > Regards,
> >
> > Laurent Pinchart
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
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