[PATCH] gpio: Get rid of gpio_hog_probe_all()

[Quentin Schulz]

Hi Marek,

On 9/19/22 21:45, Marek Vasut wrote:
> The gpio_hog_probe_all() functionality can be perfectly well replaced by
> DM_FLAG_PROBE_AFTER_BIND DM flag, which would trigger .probe() callback
> of each GPIO hog driver instance after .bind() and thus configure the
> hogged GPIO accordingly.
> 
> Signed-off-by: Marek Vasut <marex at denx.de>

This patch breaks the U-Boot proper loading fallback mechanism on Puma 
RK3399.

https://lore.kernel.org/u-boot/20220915091432.789294-1-foss+uboot@0leil.net/ 
is the base I used, on top of commit d6a03711fd with your patch applied 
on top.

I need the GPIO hogs to be probed before the SPL starts looking for 
storage media for U-Boot proper because the GPIO hog is necessary on the 
HW level for the eMMC and SPI-NOR flash to be usable.

Basically, we have a switch on the board disabling eMMC and SPI-NOR so 
that we can boot from SD card, but we want to be able to load U-Boot 
proper from eMMC/SPI-NOR. The GPIO hog overrides this HW switch. Use 
case is to recover from a corrupted SPL without touching U-Boot proper.

Cheers,
Quentin