[S] Change in coreboot[main]: mb/google/nissa/var/craaskov: Implement touchscreen power sequencing

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/79764?usp=email )

Change subject: mb/google/nissa/var/craaskov: Implement touchscreen power sequencing
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mb/google/nissa/var/craaskov: 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).

BUG=b:317746281
TEST=emerge-nissa coreboot chromeos-bootimage

Change-Id: I3ca2e2d12a86eaae9e37870a2541c0287e354690
Signed-off-by: Rex Chou 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79764
Reviewed-by: Dtrain Hsu 
Reviewed-by: Ian Feng 
Reviewed-by: Matt DeVillier 
Reviewed-by: Eric Lai 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/google/brya/variants/craaskov/Makefile.inc
M src/mainboard/google/brya/variants/craaskov/gpio.c
2 files changed, 16 insertions(+), 0 deletions(-)

Approvals:
  Matt DeVillier: Looks good to me, approved
  Ian Feng: Looks good to me, approved
  Dtrain Hsu: Looks good to me, approved
  Eric Lai: Looks good to me, approved
  build bot (Jenkins): Verified

diff --git a/src/mainboard/google/brya/variants/craaskov/Makefile.inc b/src/mainboard/google/brya/variants/craaskov/Makefile.inc
index 7822c45..d3f2f68 100644
--- a/src/mainboard/google/brya/variants/craaskov/Makefile.inc
+++ b/src/mainboard/google/brya/variants/craaskov/Makefile.inc
@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 bootblock-y += gpio.c

+romstage-y += gpio.c
+
 ramstage-y += gpio.c
 ramstage-y += variant.c
 ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
diff --git a/src/mainboard/google/brya/variants/craaskov/gpio.c b/src/mainboard/google/brya/variants/craaskov/gpio.c
index 8b1446d..0d280ce 100644
--- a/src/mainboard/google/brya/variants/craaskov/gpio.c
+++ b/src/mainboard/google/brya/variants/craaskov/gpio.c
@@ -63,6 +63,14 @@
    PAD_CFG_NF(GPP_H11, NONE, DEEP, NF2),
 };

+static const struct pad_config romstage_gpio_table[] = {
+	/* 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)
 {
    *num = ARRAY_SIZE(override_gpio_table);
@@ -74,3 +82,9 @@
    *num = ARRAY_SIZE(early_gpio_table);
    return early_gpio_table;
 }
+
+const struct pad_config *variant_romstage_gpio_table(size_t *num)
+{
+	*num = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
+}