[PATCH 1/3] drm/bridge: ti-sn65dsi83: Add vcc supply regulator support

[Sam Ravnborg]

Hi Alexander,
On Wed, Oct 06, 2021 at 09:47:11AM +0200, Alexander Stein wrote:
> VCC needs to be enabled before releasing the enable GPIO.
> 
> Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
> ---
>  drivers/gpu/drm/bridge/ti-sn65dsi83.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> index a32f70bc68ea..5fab0fabcd15 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> @@ -33,6 +33,7 @@
>  #include <linux/of_device.h>
>  #include <linux/of_graph.h>
>  #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_bridge.h>
> @@ -143,6 +144,7 @@ struct sn65dsi83 {
>  	struct mipi_dsi_device		*dsi;
>  	struct drm_bridge		*panel_bridge;
>  	struct gpio_desc		*enable_gpio;
> +	struct regulator		*vcc;
>  	int				dsi_lanes;
>  	bool				lvds_dual_link;
>  	bool				lvds_dual_link_even_odd_swap;
> @@ -647,6 +649,12 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
>  
>  	ctx->panel_bridge = panel_bridge;
>  
> +	ctx->vcc = devm_regulator_get(dev, "vcc");
> +	if (IS_ERR(ctx->vcc))
> +		return dev_err_probe(dev, PTR_ERR(ctx->vcc),
> +				     "Failed to get supply 'vcc': %pe\n",
> +				     ERR_PTR(ret));
The use of ERR_PTR(ret) is wrong here as ret do not include the return
result. Just use ctx->vcc instead as this is what %pe expects.


> +
>  	return 0;
>  }
>  
> @@ -690,7 +698,11 @@ static int sn65dsi83_probe(struct i2c_client *client,
>  	ctx->bridge.of_node = dev->of_node;
>  	drm_bridge_add(&ctx->bridge);
>  
> -	return 0;
> +	ret = regulator_enable(ctx->vcc);
> +	if (ret)
> +		dev_err(dev, "Failed to enable vcc\n");
Print the return code too?

With the two things fixed you can add my:
Reviewed-by: Sam Ravnborg <sam at ravnborg.org>

> +
> +	return ret;
>  }
>  
>  static int sn65dsi83_remove(struct i2c_client *client)
> @@ -701,6 +713,7 @@ static int sn65dsi83_remove(struct i2c_client *client)
>  	mipi_dsi_device_unregister(ctx->dsi);
>  	drm_bridge_remove(&ctx->bridge);
>  	of_node_put(ctx->host_node);
> +	regulator_disable(ctx->vcc);
>  
>  	return 0;
>  }
> -- 
> 2.25.1