[PATCH] regulator: fix: Move code to enable gpio regulator to pre_probe from ofdata_to_platdata

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

Hi Lukasz

On 1/25/20 9:00 AM, Lukasz Majewski wrote:
> The commit e8e9715df2d4 ("regulator: fixed: Modify enable-active-high behavior")
> fixed the regulator driver behavior when 'enable-active-high' is defined.
> Unfortunately, this patch used dm_regulator_platdata()'s "boot_on" member
> to set GPIOD_IS_OUT_ACTIVE flag and enable the regulator.
>
> The issue here is that regulator_common_ofdata_to_platdata() is called
> _before_ regulator_pre_probe() function in which the 'regulator-boot-on'
> property is asserted.
>
> As a result the GPIOD_IS_OUT_ACTIVE flag is not set and gpio_request_by_name()
> called in the former function is not enabling the regulator.
> This is problematic for e.g. i.MX ethernet driver, which then tries to
> perform initialization without power (and fails).
>
> The solution here is to explicitly enable regulator in regulator_pre_probe()
> callback only when 'regulator-boot-on' property is present in device tree.
> The GPIOD_IS_OUT_ACTIVE flag is not set at all, but relevant gpio is
> requested.
>
> Signed-off-by: Lukasz Majewski <lukma@denx.de>
> ---
>
>  drivers/power/regulator/regulator-uclass.c | 3 +++
>  drivers/power/regulator/regulator_common.c | 5 -----
>  2 files changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
> index 90961de95c..c9d26344d7 100644
> --- a/drivers/power/regulator/regulator-uclass.c
> +++ b/drivers/power/regulator/regulator-uclass.c
> @@ -464,6 +464,9 @@ 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 939efb2c0d..33b73b7c2f 100644
> --- a/drivers/power/regulator/regulator_common.c
> +++ b/drivers/power/regulator/regulator_common.c
> @@ -12,16 +12,11 @@ int regulator_common_ofdata_to_platdata(struct udevice *dev,
>  	struct regulator_common_platdata *dev_pdata, const char *enable_gpio_name)
>  {
>  	struct gpio_desc *gpio;
> -	struct dm_regulator_uclass_platdata *uc_pdata;
>  	int flags = GPIOD_IS_OUT;
>  	int ret;
>  
> -	uc_pdata = dev_get_uclass_platdata(dev);
> -
>  	if (!dev_read_bool(dev, "enable-active-high"))
>  		flags |= GPIOD_ACTIVE_LOW;
> -	if (uc_pdata->boot_on)
> -		flags |= GPIOD_IS_OUT_ACTIVE;
>  
>  	/* Get optional enable GPIO desc */
>  	gpio = &dev_pdata->gpio;

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

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

Tested on STM32MP1-ev1.

Thanks

Patrice