mb/google/dedede: Implement touchscreen power sequencing

For touchscreens on dedede variants, drive the enable GPIO high
starting in romstage, then disable the reset GPIO in ramstage. This will
allow coreboot to detect the presence of i2c touchscreens during ACPI
SSDT generation (implemented in a subsequent commit).

Since the fast majority of dedede variants have a touchscreen option,
and those that do use the same GPIOs for enable/reset, set the GPIOs for
touchscreen operation in the baseboard and then override for the few (3)
variants that do not have a touchscreen.

BUG=b:121309055
TEST=tested with rest of patch train

Change-Id: Ib95e23545cc3e8589ddbd9e18cd0533bec9333e0
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71187
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

4 files changed, 62 insertions, 4 deletions

diff --git a/src/mainboard/google/dedede/variants/baseboard/gpio.c b/src/mainboard/google/dedede/variants/baseboard/gpio.c
index 1f12fb7fe282..f377d9a2ca38 100644
--- a/src/mainboard/google/dedede/variants/baseboard/gpio.c
+++ b/src/mainboard/google/dedede/variants/baseboard/gpio.c
@@ -165,9 +165,9 @@ static const struct pad_config gpio_table[] = {
 	/* D4  : TOUCH_INT_ODL */
 	PAD_CFG_GPI_APIC(GPP_D4, NONE, PLTRST, LEVEL, INVERT),
 	/* D5  : TOUCH_RESET_L */
-	PAD_CFG_GPO(GPP_D5, 0, DEEP),
+	PAD_CFG_GPO(GPP_D5, 1, DEEP),
 	/* D6  : EN_PP3300_TOUCH_S0 */
-	PAD_CFG_GPO(GPP_D6, 0, DEEP),
+	PAD_CFG_GPO(GPP_D6, 1, DEEP),
 	/* D7  : EMR_INT_ODL */
 	PAD_NC(GPP_D7, NONE),
 	/* D8  : GPP_D8/GSPI2_CS0B/UART0A_RXD */
@@ -469,10 +469,18 @@ const struct pad_config *__weak variant_sleep_gpio_table(size_t *num)
 	return sleep_gpio_table;
 }
 
+static const struct pad_config romstage_gpio_table[] = {
+	/* Enable touchscreen, hold in reset */
+	/* D5  : TOUCH_RESET_L */
+	PAD_CFG_GPO(GPP_D5, 0, DEEP),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_CFG_GPO(GPP_D6, 1, DEEP),
+};
+
 const struct pad_config *__weak variant_romstage_gpio_table(size_t *num)
 {
-	*num = 0;
-	return NULL;
+	*num = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
 }
 
 static const struct cros_gpio cros_gpios[] = {
diff --git a/src/mainboard/google/dedede/variants/beadrix/gpio.c b/src/mainboard/google/dedede/variants/beadrix/gpio.c
index cf7d6efb4f85..131cb96ad6f4 100644
--- a/src/mainboard/google/dedede/variants/beadrix/gpio.c
+++ b/src/mainboard/google/dedede/variants/beadrix/gpio.c
@@ -28,6 +28,10 @@ static const struct pad_config gpio_table[] = {
 
 	/* D0  : WWAN_HOST_WAKE ==> WWAN_WDISABLE_L */
 	PAD_CFG_GPO(GPP_D0, 1, DEEP),
+	/* D5  : TOUCH_RESET_L */
+	PAD_NC(GPP_D5, NONE),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_NC(GPP_D6, NONE),
 	/* D12 : WCAM_RST_L ==> NC */
 	PAD_NC(GPP_D12, NONE),
 	/* D13 : EN_PP2800_CAMERA */
@@ -102,6 +106,20 @@ const struct pad_config *variant_override_gpio_table(size_t *num)
 	return gpio_table;
 }
 
+static const struct pad_config romstage_gpio_table[] = {
+	/* no touchscreen present */
+	/* D5  : TOUCH_RESET_L */
+	PAD_NC(GPP_D5, NONE),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_NC(GPP_D6, NONE),
+};
+
+const struct pad_config *__weak variant_romstage_gpio_table(size_t *num)
+{
+	*num = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
+}
+
 static void fw_config_handle(void *unused)
 {
 	 if (!fw_config_probe(FW_CONFIG(DB_PORTS, DB_PORTS_1C_LTE)))
diff --git a/src/mainboard/google/dedede/variants/cappy2/gpio.c b/src/mainboard/google/dedede/variants/cappy2/gpio.c
index 87f5e46fc409..d5bc9ae6c1a2 100644
--- a/src/mainboard/google/dedede/variants/cappy2/gpio.c
+++ b/src/mainboard/google/dedede/variants/cappy2/gpio.c
@@ -7,6 +7,10 @@
 
 /* Pad configuration in ramstage */
 static const struct pad_config gpio_table[] = {
+	/* D5  : TOUCH_RESET_L */
+	PAD_NC(GPP_D5, NONE),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_NC(GPP_D6, NONE),
 	/* D15 : EN_PP3300_CAMERA */
 	PAD_CFG_GPO(GPP_D15, 1, PLTRST),
 	/* H16 : AP_SUB_IO_L ==> HP_RST_ODL */
@@ -27,6 +31,20 @@ static const struct pad_config codec_cs42l42_pads[] = {
 	PAD_NC(GPP_D18, NONE),
 };
 
+static const struct pad_config romstage_gpio_table[] = {
+	/* no touchscreen present */
+	/* D5  : TOUCH_RESET_L */
+	PAD_NC(GPP_D5, NONE),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_NC(GPP_D6, NONE),
+};
+
+const struct pad_config *__weak variant_romstage_gpio_table(size_t *num)
+{
+	*num = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
+}
+
 static void fw_config_handle(void *unused)
 {
 	if (fw_config_probe(FW_CONFIG(AUDIO_CODEC_SOURCE, AUDIO_CODEC_ALC5682)))
diff --git a/src/mainboard/google/dedede/variants/sasuke/gpio.c b/src/mainboard/google/dedede/variants/sasuke/gpio.c
index 8aa9f292e385..011b6e74eddd 100644
--- a/src/mainboard/google/dedede/variants/sasuke/gpio.c
+++ b/src/mainboard/google/dedede/variants/sasuke/gpio.c
@@ -70,3 +70,17 @@ const struct pad_config *variant_override_gpio_table(size_t *num)
 	*num = ARRAY_SIZE(gpio_table);
 	return gpio_table;
 }
+
+static const struct pad_config romstage_gpio_table[] = {
+	/* no touchscreen present */
+	/* D5  : TOUCH_RESET_L */
+	PAD_NC(GPP_D5, NONE),
+	/* D6  : EN_PP3300_TOUCH_S0 */
+	PAD_NC(GPP_D6, NONE),
+};
+
+const struct pad_config *__weak variant_romstage_gpio_table(size_t *num)
+{
+	*num = ARRAY_SIZE(romstage_gpio_table);
+	return romstage_gpio_table;
+}