diff options
| author | Matt DeVillier <matt.devillier@gmail.com> | 2023-04-27 09:55:51 -0500 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-08-09 13:40:15 +0000 |
| commit | d7d74f106d7460709ca6ac069a33cf03790db293 (patch) | |
| tree | e0745c6a2dd445c48c0b730e3508d655cc3fcf18 /src/mainboard/google/brya/variants/omnigul/gpio.c | |
| parent | 204ffcb98d5594983aed047ec2430e0b6aa515a0 (diff) | |
mb/google/brya: Implement touchscreen power sequencing
For brya variants with a touchscreen, drive the enable GPIO high
starting in romstage while holding in reset, then disable the reset
GPIO in ramstage (done in the baseboard). This will allow coreboot
to detect the presence of i2c touchscreens during ACPI SSDT generation
(implemented in a subsequent commit).
BUG=b:121309055
TEST=tested with rest of patch train
Change-Id: I8e56ac4834ce69de18bef2d34f5c361a7fda1aab
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74928
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Diffstat (limited to 'src/mainboard/google/brya/variants/omnigul/gpio.c')
| -rw-r--r-- | src/mainboard/google/brya/variants/omnigul/gpio.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/brya/variants/omnigul/gpio.c b/src/mainboard/google/brya/variants/omnigul/gpio.c index 704ef8fae7..d3f907d21d 100644 --- a/src/mainboard/google/brya/variants/omnigul/gpio.c +++ b/src/mainboard/google/brya/variants/omnigul/gpio.c @@ -316,6 +316,12 @@ static const struct pad_config romstage_gpio_table[] = { * B4 is programmed here so that it is sequenced after EN_PP3300_SSD. */ PAD_CFG_GPO(GPP_B4, 1, DEEP), + + /* Enable touchscreen, hold in reset */ + /* C0 : SMBCLK ==> EN_PP3300_TCHSCR */ + PAD_CFG_GPO(GPP_C0, 1, DEEP), + /* C1 : SMBDATA ==> USI_RST_L */ + PAD_CFG_GPO(GPP_C1, 0, DEEP), }; const struct pad_config *variant_gpio_override_table(size_t *num) |