This commit populates the `board_id()` and `sku_id()` functions
for the Google Bluey mainboard, replacing the previous placeholder
implementations.
- The Board ID (`board_id()`) is now determined by reading a set of
four GPIO pins (GPIO138 as MSB, GPIO137, GPIO136, GPIO135 as LSB)
and interpreting their states as a base-3 encoded value using
the `gpio_base3_value()` helper.
- The SKU ID (`sku_id()`) is retrieved from the Google ChromeEC
by calling `google_chromeec_get_board_sku()` when a ChromeEC
is configured (`CONFIG(EC_GOOGLE_CHROMEEC)`).
Both ID values are cached after their initial determination to
avoid redundant reads.
BUG=b:404985109
TEST=Able to build google/bluey
Change-Id: Ic5a084e35b33a82fef76f33c2663aba7a48c16a7
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/87861
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Pranava Y N <pranavayn@google.com>
6c87853a83