Hi Laurent,
On 2021-12-16 11:09 p.m., Laurent Pinchart wrote:
> From: Thomas Nizan <tnizan@xxxxxxxxxxx>
>
> Allow users to use one PoC regulator per port, instead of a global
> regulator.
>
> The properties '^port[0-3]-poc-supply$' in the DT node are used to
> indicate the regulators for individual ports.
>
Signed-off-by: Thomas Nizan <tnizan@xxxxxxxxxxx>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/i2c/max9286.c | 112 +++++++++++++++++++++++++++++++-----
> 1 file changed, 98 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> index 7c663fd587bb..fa2f6a823fe6 100644
> --- a/drivers/media/i2c/max9286.c
> +++ b/drivers/media/i2c/max9286.c
> @@ -136,8 +136,10 @@
> #define MAX9286_SRC_PAD 4
>
> struct max9286_source {
> + unsigned int index;
> struct v4l2_subdev *sd;
> struct fwnode_handle *fwnode;
> + struct regulator *regulator;
> };
>
> struct max9286_asd {
> @@ -1072,6 +1074,49 @@ static int max9286_register_gpio(struct max9286_priv *priv)
> return ret;
> }
>
> +static int max9286_poc_power_on(struct max9286_priv *priv)
> +{
> + struct max9286_source *source;
> + unsigned int enabled = 0;
> + int ret;
> +
> + /* Enable the global regulator if available. */
> + if (priv->regulator)
> + return regulator_enable(priv->regulator);
> +
> + /* Otherwise use the per-port regulators. */
> + for_each_source(priv, source) {
> + ret = regulator_enable(source->regulator);
> + if (ret < 0)
> + goto error;
> +
> + enabled |= BIT(source->index);
> + }
> +
> + return 0;
> +
> +error:
> + for_each_source(priv, source) {
> + if (enabled & BIT(source->index))
> + regulator_disable(source->regulator);
> + }
> +
> + return ret;
> +}
> +
> +static void max9286_poc_power_off(struct max9286_priv *priv)
> +{
> + struct max9286_source *source;
> +
> + if (priv->regulator) {
> + regulator_disable(priv->regulator);
> + return;
> + }
> +
> + for_each_source(priv, source)
> + regulator_disable(source->regulator);
> +}
> +
> static int max9286_init(struct device *dev)
> {
> struct max9286_priv *priv;
> @@ -1082,9 +1127,9 @@ static int max9286_init(struct device *dev)
> priv = i2c_get_clientdata(client);
>
> /* Enable the bus power. */
> - ret = regulator_enable(priv->regulator);
> + ret = max9286_poc_power_on(priv);
> if (ret < 0) {
> - dev_err(&client->dev, "Unable to turn PoC on\n");
> + dev_err(dev, "Unable to turn PoC on\n");
> return ret;
> }
>
> @@ -1118,7 +1163,7 @@ static int max9286_init(struct device *dev)
> err_v4l2_register:
> max9286_v4l2_unregister(priv);
> err_regulator:
> - regulator_disable(priv->regulator);
> + max9286_poc_power_off(priv);
>
> return ret;
> }
> @@ -1215,6 +1260,7 @@ static int max9286_parse_dt(struct max9286_priv *priv)
> }
>
> source = &priv->sources[ep.port];
> + source->index = ep.port;
> source->fwnode = fwnode_graph_get_remote_endpoint(
> of_fwnode_handle(node));
> if (!source->fwnode) {
> @@ -1249,6 +1295,50 @@ static int max9286_parse_dt(struct max9286_priv *priv)
> return 0;
> }
>
> +static int max9286_get_poc_supplies(struct max9286_priv *priv)
> +{
> + struct device *dev = &priv->client->dev;
> + struct max9286_source *source;
> +
> + /*
> + * Start by getting the global regulator. Usage of the exclusive API is
> + * required to receive an error in case the supply isn't specified in
> + * the device tree.
> + */
> + priv->regulator = devm_regulator_get_exclusive(dev, "poc");
> + if (!IS_ERR(priv->regulator))
> + return 0;
> +
> + if (PTR_ERR(priv->regulator) != -ENODEV) {
> + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER)
> + dev_err(dev, "Unable to get PoC regulator: %ld\n",
> + PTR_ERR(priv->regulator));
> + return PTR_ERR(priv->regulator);
> + }
> +
> + /* If there's no global regulator, get per-port regulators. */
> + dev_dbg(dev,
> + "No global PoC regulator, looking for per-port regulators\n");
> + priv->regulator = NULL;
> +
> + for_each_source(priv, source) {
> + char name[10];
> +
> + snprintf(name, sizeof(name), "port%u-poc", source->index);
> + source->regulator = devm_regulator_get_exclusive(dev, name);
> + if (IS_ERR(source->regulator)) {
> + if (PTR_ERR(source->regulator) != -EPROBE_DEFER)
> + dev_err(dev,
> + "Unable to get port %u PoC regulator: %ld\n",
> + source->index,
> + PTR_ERR(source->regulator));
> + return PTR_ERR(source->regulator);
> + }
> + }
> +
> + return 0;
> +}
> +
> static int max9286_probe(struct i2c_client *client)
> {
> struct max9286_priv *priv;
> @@ -1293,17 +1383,11 @@ static int max9286_probe(struct i2c_client *client)
> if (ret)
> goto err_powerdown;
>
> - priv->regulator = devm_regulator_get(&client->dev, "poc");
> - if (IS_ERR(priv->regulator)) {
> - if (PTR_ERR(priv->regulator) != -EPROBE_DEFER)
> - dev_err(&client->dev,
> - "Unable to get PoC regulator (%ld)\n",
> - PTR_ERR(priv->regulator));
> - ret = PTR_ERR(priv->regulator);
> - goto err_powerdown;
> - }
> -
> ret = max9286_parse_dt(priv);
> + if (ret)
> + goto err_cleanup_dt;
> +
> + ret = max9286_get_poc_supplies(priv);
> if (ret)
> goto err_powerdown;
>
> @@ -1329,7 +1413,7 @@ static int max9286_remove(struct i2c_client *client)
>
> max9286_v4l2_unregister(priv);
>
> - regulator_disable(priv->regulator);
> + max9286_poc_power_off(priv);
>
> gpiod_set_value_cansleep(priv->gpiod_pwdn, 0);
>
>
Regards,
Thomas
