[PATCH 7/8] adc: rockchip-saradc: Use vdd-microvolts prop as fallback

[Kever Yang]

On 2024/10/18 04:00, Jonas Karlman wrote:
> Change to use vdd-microvolts prop value as voltage reference when the
> supply regulator is missing or when DM_REGULATOR=n is used.
>
> Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>

Thanks,
- Kever
> ---
>   drivers/adc/rockchip-saradc.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/adc/rockchip-saradc.c b/drivers/adc/rockchip-saradc.c
> index f6832ab30731..7cf9735f60d0 100644
> --- a/drivers/adc/rockchip-saradc.c
> +++ b/drivers/adc/rockchip-saradc.c
> @@ -241,7 +241,7 @@ int rockchip_saradc_probe(struct udevice *dev)
>   {
>   	struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
>   	struct rockchip_saradc_priv *priv = dev_get_priv(dev);
> -	struct udevice *vref;
> +	struct udevice *vref = NULL;
>   	struct clk clk;
>   	int vref_uv;
>   	int ret;
> @@ -259,7 +259,7 @@ int rockchip_saradc_probe(struct udevice *dev)
>   	priv->active_channel = -1;
>   
>   	ret = device_get_supply_regulator(dev, "vref-supply", &vref);
> -	if (ret) {
> +	if (ret && uc_pdata->vdd_microvolts <= 0) {
>   		printf("can't get vref-supply: %d\n", ret);
>   		return ret;
>   	}
> @@ -267,7 +267,10 @@ int rockchip_saradc_probe(struct udevice *dev)
>   	if (priv->reset)
>   		rockchip_saradc_reset_controller(priv->reset);
>   
> -	vref_uv = regulator_get_value(vref);
> +	if (vref)
> +		vref_uv = regulator_get_value(vref);
> +	else
> +		vref_uv = uc_pdata->vdd_microvolts;
>   	if (vref_uv < 0) {
>   		printf("can't get vref-supply value: %d\n", vref_uv);
>   		return vref_uv;