GPIO request failures for Renesas rcar-gen3

[Marek Vasut <marek.vasut@gmail.com>]

On 6/18/20 10:33 PM, Adam Ford wrote:
> I am trying to port U-Boot to a new product based on a Renesas RZ/G2M
> (rcar-gen3).  We're have this working with Renesas' version from
> 2018.09, but I am trying to integrate it with U-Boot 2020.07-rc4
> 
> What's happening is that it seems like all GPIO are failing to be
> requested, so things like regulator-gpio fail, reset-gpios, etc. all
> return errors.
> 
> The dm tree and gpio status commands all appear to show gpio banks are
> enumerating, but since nothing can use the GPIO's it seems like the
> common thread is the gpio driver for the rcar3.
> 
> I was hoping someone might have some thoughts of things I could try or
> investigate.  In order to properly set the voltage for the MMC card, I
> need "regulator-gpio" to operate correctly.

Note that RZ/G2M is not supported by mainline U-Boot.

Also note that the GPIO driver and PFC drivers are working together,
grep for sh_pfc_config_mux_for_gpio(), so unless both work and probed,
the GPIO driver will likely not work.

Can you provide 'dm tree' output ?