regulator: fix: Move code to enable gpio regulator to pre_probe from ofdata_to_platdata

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 at denx.de>
---

 drivers/power/regulator/regulator-uclass.c | 3 +++
 drivers/power/regulator/regulator_common.c | 5 -----
 2 files changed, 3 insertions(+), 5 deletions(-)

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 at 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 at st.com>

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

Tested on STM32MP1-ev1.

Thanks

Patrice