Re: [PATCH v5 4/4] media: i2c: imx412: Add bulk regulator support

["Alessandrelli, Daniele" <daniele.alessandrelli@intel.com>]

On Fri, 2022-04-15 at 12:59 +0100, Bryan O'Donoghue wrote:
> Depending on the platform we may need to enable and disable three separate
> regulators for the imx412.
> 
> - DOVDD
> Digital I/O power
> 
> - AVDD
> Analog power
> 
> - DVDD
> Digital core power
> 
> The addition of these regulators shouldn't affect existing users using
> fixed-on/firmware-controlled regulators.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Acked-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>

> ---
>  drivers/media/i2c/imx412.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/media/i2c/imx412.c b/drivers/media/i2c/imx412.c
> index 84279a680873..1795a6180d60 100644
> --- a/drivers/media/i2c/imx412.c
> +++ b/drivers/media/i2c/imx412.c
> @@ -11,6 +11,7 @@
>  #include <linux/i2c.h>
>  #include <linux/module.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <media/v4l2-ctrls.h>
>  #include <media/v4l2-fwnode.h>
> @@ -101,6 +102,12 @@ struct imx412_mode {
>         struct imx412_reg_list reg_list;
>  };
>  
> +static const char * const imx412_supply_names[] = {
> +       "dovdd",        /* Digital I/O power */
> +       "avdd",         /* Analog power */
> +       "dvdd",         /* Digital core power */
> +};
> +
>  /**
>   * struct imx412 - imx412 sensor device structure
>   * @dev: Pointer to generic device
> @@ -128,6 +135,7 @@ struct imx412 {
>         struct media_pad pad;
>         struct gpio_desc *reset_gpio;
>         struct clk *inclk;
> +       struct regulator_bulk_data supplies[ARRAY_SIZE(imx412_supply_names)];
>         struct v4l2_ctrl_handler ctrl_handler;
>         struct v4l2_ctrl *link_freq_ctrl;
>         struct v4l2_ctrl *pclk_ctrl;
> @@ -946,6 +954,16 @@ static int imx412_parse_hw_config(struct imx412 *imx412)
>                 return -EINVAL;
>         }
>  
> +       /* Get optional DT defined regulators */
> +       for (i = 0; i < ARRAY_SIZE(imx412_supply_names); i++)
> +               imx412->supplies[i].supply = imx412_supply_names[i];
> +
> +       ret = devm_regulator_bulk_get(imx412->dev,
> +                                     ARRAY_SIZE(imx412_supply_names),
> +                                     imx412->supplies);
> +       if (ret)
> +               return ret;
> +
>         ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
>         if (!ep)
>                 return -ENXIO;
> @@ -1011,6 +1029,13 @@ static int imx412_power_on(struct device *dev)
>         struct imx412 *imx412 = to_imx412(sd);
>         int ret;
>  
> +       ret = regulator_bulk_enable(ARRAY_SIZE(imx412_supply_names),
> +                                   imx412->supplies);
> +       if (ret < 0) {
> +               dev_err(dev, "failed to enable regulators\n");
> +               return ret;
> +       }
> +
>         gpiod_set_value_cansleep(imx412->reset_gpio, 0);
>  
>         ret = clk_prepare_enable(imx412->inclk);
> @@ -1025,6 +1050,8 @@ static int imx412_power_on(struct device *dev)
>  
>  error_reset:
>         gpiod_set_value_cansleep(imx412->reset_gpio, 1);
> +       regulator_bulk_disable(ARRAY_SIZE(imx412_supply_names),
> +                              imx412->supplies);
>  
>         return ret;
>  }
> @@ -1044,6 +1071,9 @@ static int imx412_power_off(struct device *dev)
>  
>         gpiod_set_value_cansleep(imx412->reset_gpio, 1);
>  
> +       regulator_bulk_disable(ARRAY_SIZE(imx412_supply_names),
> +                              imx412->supplies);
> +
>         return 0;
>  }
>