On Wed, Nov 15, 2023 at 1:14 PM Francesco Dolcini wrote:
>
> From: Stefan Eichenberger
>
> Add supplies to the driver that can be used to turn the Lontium lt8912b
> on and off. It can have up to 7 independent supplies, we add them all
> and enable/disable them with bulk_enable/disable.
>
> Signed-off-by: Stefan Eichenberger
> Signed-off-by: Francesco Dolcini
> ---
> drivers/gpu/drm/bridge/lontium-lt8912b.c | 30
> 1 file changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c
> b/drivers/gpu/drm/bridge/lontium-lt8912b.c
> index 097ab04234b7..273157428c82 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
> @@ -43,6 +43,8 @@ struct lt8912 {
>
> struct videomode mode;
>
> + struct regulator_bulk_data supplies[7];
> +
> u8 data_lanes;
> bool is_power_on;
> };
> @@ -257,6 +259,12 @@ static int lt8912_free_i2c(struct lt8912 *lt)
>
> static int lt8912_hard_power_on(struct lt8912 *lt)
> {
> + int ret;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), lt->supplies);
> + if (ret)
> + return ret;
> +
> gpiod_set_value_cansleep(lt->gp_reset, 0);
> msleep(20);
>
> @@ -267,6 +275,9 @@ static void lt8912_hard_power_off(struct lt8912 *lt)
> {
> gpiod_set_value_cansleep(lt->gp_reset, 1);
> msleep(20);
> +
> + regulator_bulk_disable(ARRAY_SIZE(lt->supplies), lt->supplies);
> +
> lt->is_power_on = false;
> }
>
> @@ -661,6 +672,21 @@ static int lt8912_bridge_suspend(struct device *dev)
>
> static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend,
> lt8912_bridge_resume);
>
> +static int lt8912_get_regulators(struct lt8912 *lt)
> +{
> + unsigned int i;
> + const char * const supply_names[] = {
> + "vdd", "vccmipirx", "vccsysclk", "vcclvdstx",
> + "vcchdmitx", "vcclvdspll", "vcchdmipll"
> + };
> +
> + for (i = 0; i < ARRAY_SIZE(lt->supplies); i++)
> + lt->supplies[i].supply = supply_names[i];
> +
> + return devm_regulator_bulk_get(lt->dev, ARRAY_SIZE(lt->supplies),
> + lt->supplies);
> +}
> +
> static int lt8912_parse_dt(struct lt8912 *lt)
> {
> struct gpio_desc *gp_reset;
> @@ -712,6 +738,10 @@ static int lt8912_parse_dt(struct lt8912 *lt)
> goto err_free_host_node;
> }
>
> + ret = lt8912_get_regulators(lt);
> + if (ret)
> + goto err_free_host_node;
> +
> of_node_put(port_node);
> return 0;
>
> --
> 2.25.1
>
Reviewed-by: Robert Foss
