[PATCH] mmc: Add SPL_MMC_PWRSEQ to fix link issue when building SPL

[Ferass El Hafidi]

On Mon Sep 25, 2023 at 11:55 PM CEST, Jonas Karlman wrote:
> With MMC_PWRSEQ enabled the following link issue may happen when
> building SPL and SPL_PWRSEQ is not enabled.
>
>   aarch64-linux-gnu-ld.bfd: drivers/mmc/meson_gx_mmc.o: in function `meson_mmc_probe':
>   drivers/mmc/meson_gx_mmc.c:295: undefined reference to `pwrseq_set_power'
>
> Fix this by adding a SPL_MMC_PWRSEQ Kconfig option used to enable mmc
> pwrseq support in SPL.
>
> Also add depends on DM_GPIO to fix following link issue:
>
>   aarch64-linux-gnu-ld.bfd: drivers/mmc/mmc-pwrseq.o: in function `mmc_pwrseq_set_power':
>   drivers/mmc/mmc-pwrseq.c:26: undefined reference to `gpio_request_by_name'
>   aarch64-linux-gnu-ld.bfd: drivers/mmc/mmc-pwrseq.c:29: undefined reference to `dm_gpio_set_value'
>   aarch64-linux-gnu-ld.bfd: drivers/mmc/mmc-pwrseq.c:31: undefined reference to `dm_gpio_set_value'
>
> Signed-off-by: Jonas Karlman <jonas at kwiboo.se>

This issue was discovered while working on SPL support for Amlogic
devices (not upstream yet), which is why the errors are related to
the `meson_gx_mmc.c` file. It doesn't seem to be an issue specific to
meson_gx_mmc though.

Cheers.