[PATCH v2 2/3] drm/bridge: lvds-codec: Add support for regulator
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Tue Aug 11 10:59:55 UTC 2020
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 at 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 at 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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