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

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/79311?usp=email )

Change subject: mb/google/galdos/var/lars: Implement touchscreen power sequencing
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mb/google/galdos/var/lars: Implement touchscreen power sequencing

Since lars has two touchscreen options, we need to determine which (if
any) are present on a given device at runtime so that there are not
multiple ACPI touchscreen devices (as it makes Windows unhappy).
Implement power sequencing and runtime detection for both touchscreen
options.

TEST=build/boot Win11/Linux on google/lars, verify touchscreen detected
and functional under both OSes.

Change-Id: I49ccb29ec4589315a4abe3c0ea8fa76f97080bcd
Signed-off-by: Matt DeVillier 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79311
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
---
M src/mainboard/google/glados/variants/lars/include/variant/gpio.h
M src/mainboard/google/glados/variants/lars/overridetree.cb
2 files changed, 16 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Eric Lai: Looks good to me, approved

diff --git a/src/mainboard/google/glados/variants/lars/include/variant/gpio.h b/src/mainboard/google/glados/variants/lars/include/variant/gpio.h
index 5ff059b..611ee24 100644
--- a/src/mainboard/google/glados/variants/lars/include/variant/gpio.h
+++ b/src/mainboard/google/glados/variants/lars/include/variant/gpio.h
@@ -216,6 +216,10 @@
 /* GD_UART2_RXD */	PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1),
 /* GD_UART2_TXD */	PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1),
 /* EC_IN_RW */		PAD_CFG_GPI_GPIO_DRIVER(GPP_C6, NONE, DEEP),
+
+/* touchscreen enable, hold in reset */
+/* TCH_PNL_PWREN */	PAD_CFG_GPO(GPP_C22, 1, DEEP),
+/* TCH_PNL_RST */	PAD_CFG_GPO(GPP_E23, 0, DEEP),
 };

#endif
diff --git a/src/mainboard/google/glados/variants/lars/overridetree.cb b/src/mainboard/google/glados/variants/lars/overridetree.cb
index 717ea53..2616044 100644
--- a/src/mainboard/google/glados/variants/lars/overridetree.cb
+++ b/src/mainboard/google/glados/variants/lars/overridetree.cb
@@ -18,12 +18,24 @@
    			register "hid" = ""ELAN0001""
    			register "desc" = ""ELAN Touchscreen""
    			register "irq" = "ACPI_IRQ_EDGE_LOW(GPP_E7_IRQ)"
+				register "detect" = "1"
+				register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_E7)"
+				register "reset_delay_ms" = "20"
+				register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E23)"
+				register "enable_delay_ms" = "1"
+				register "has_power_resource" = "1"
    			device i2c 10 on end
    		end
    		chip drivers/i2c/generic
    			register "hid" = ""MLFS0000""
    			register "desc" = ""Melfas Touchscreen""
    			register "irq" = "ACPI_IRQ_EDGE_LOW(GPP_E7_IRQ)"
+				register "detect" = "1"
+				register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_E7)"
+				register "reset_delay_ms" = "10"
+				register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E23)"
+				register "enable_delay_ms" = "55"
+				register "has_power_resource" = "1"
    			device i2c 34 on end
    		end
    	end