mb/google/rex: Refactor baseboard/variant gpio pad configuration

This patch tries to simplify the baseboard/variant GPIO programming
starting with Google/Rex. The idea is to let each variant maintain
its own complete GPIO PAD configuration table instead of having a
back-and-forth call between baseboard and variants.

With this patch coreboot performing GPIO programming is now much
simpler where the common code block calls into respective variants
and gets the gpio table prior to the pad configuration.

BUG=b:238165977 (Simplify baseboard/variant GPIO programming starting
                 with Google/Rex)
TEST=Able to build and boot the Google/Rex board.
AP firmware log with DEBUG_GPIO kconfig lists the early GPIOs being
configured from the `rex0` variant.

gpio_padcfg [0xd3, 08] DW0 [0x44000300 : 0x40000400 : 0x40000400]
gpio_padcfg [0xd3, 08] DW1 [0x00000020 : 0x00000000 : 0x00000020]
gpio_padcfg [0xd3, 08] DW2 [0x00000000 : 0x00000000 : 0x00000000]
gpio_padcfg [0xd3, 08] DW3 [0x00000000 : 0x00000000 : 0x00000000]
gpio_padcfg [0xd3, 09] DW0 [0x44000300 : 0x40000400 : 0x40000400]
gpio_padcfg [0xd3, 09] DW1 [0x00000021 : 0x00000000 : 0x00000021]
gpio_padcfg [0xd3, 09] DW2 [0x00000000 : 0x00000000 : 0x00000000]
gpio_padcfg [0xd3, 09] DW3 [0x00000000 : 0x00000000 : 0x00000000]

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I8ec5c6991ec90a3884464e7f15f33327bfe4839a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65674
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions