[PATCH] regulator: fix: enable gpio when requested

[Patrice CHOTARD <patrice.chotard@st.com>]

Hi Mark

On 4/27/20 11:09 AM, Mark Kettenis wrote:
> The fix in commit b7adcdd073c0 has the side-effect that the regulator
> will be disabled when requesting the relevant gpio in
> regulator_common_ofdata_to_platdata() and enabled in
> regulator_pre_probe() when the regulator was already enabled.
> This leads to a short interruption in the 3.3V power to the PCIe
> slot on the firefly-rk3399 which makes an ADATA SX8000NP NVMe SSD
> unhappy.
>
> Fix this by setting the GPIOD_IS_OUT_ACTIVE flag again when the
> 'regulator-boot-on' property is set, but check for this property
> explicitly instead of relying on the "boot_on" member of
> the uclass platdata.
>
> Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
> ---
>  drivers/power/regulator/regulator-uclass.c | 3 ---
>  drivers/power/regulator/regulator_common.c | 2 ++
>  2 files changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
> index c9d26344d7..90961de95c 100644
> --- a/drivers/power/regulator/regulator-uclass.c
> +++ b/drivers/power/regulator/regulator-uclass.c
> @@ -464,9 +464,6 @@ static int regulator_pre_probe(struct udevice *dev)
>  	    (uc_pdata->min_uA == uc_pdata->max_uA))
>  		uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UA;
>  
> -	if (uc_pdata->boot_on)
> -		regulator_set_enable(dev, uc_pdata->boot_on);
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/power/regulator/regulator_common.c b/drivers/power/regulator/regulator_common.c
> index 33b73b7c2f..bc13b88476 100644
> --- a/drivers/power/regulator/regulator_common.c
> +++ b/drivers/power/regulator/regulator_common.c
> @@ -17,6 +17,8 @@ int regulator_common_ofdata_to_platdata(struct udevice *dev,
>  
>  	if (!dev_read_bool(dev, "enable-active-high"))
>  		flags |= GPIOD_ACTIVE_LOW;
> +	if (dev_read_bool(dev, "regulator-boot-on"))
> +		flags |= GPIOD_IS_OUT_ACTIVE;
>  
>  	/* Get optional enable GPIO desc */
>  	gpio = &dev_pdata->gpio;

Tested on STM32MP1 EV1 and DK2 boards in basic and trusted mode

Tested-by: Patrice Chotard <patrice.chotard@st.com>

Thanks