mb/google/myst: Add ELAN touch screen
Follow the eKTH7B18U_Product_Spec_V1.1 to add the device.
BUG=b:284381267
TEST=Check touch screen can detect in coreboot.
[INFO ] \_SB.I2C1.H010: ELAN Touchscreen at I2C: 02:10
Signed-off-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Change-Id: I4bd521410953892a477020a872de0d882001b178
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75480
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Jon Murphy <jpmurphy@google.com>
diff --git a/src/mainboard/google/myst/variants/myst/overridetree.cb b/src/mainboard/google/myst/variants/myst/overridetree.cb
index 6e36e43..d701dea 100644
--- a/src/mainboard/google/myst/variants/myst/overridetree.cb
+++ b/src/mainboard/google/myst/variants/myst/overridetree.cb
@@ -44,6 +44,27 @@
device i2c 15 on end
end
end # I2C0
+ device ref i2c_1 on
+ chip drivers/i2c/hid
+ register "generic.hid" = ""ELAN90FC""
+ register "generic.desc" = ""ELAN Touchscreen""
+ register "generic.irq_gpio" = "ACPI_GPIO_IRQ_LEVEL_LOW(GPIO_91)"
+ register "generic.detect" = "1"
+ register "generic.reset_gpio" =
+ "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPIO_157)"
+ register "generic.reset_delay_ms" = "20"
+ register "generic.reset_off_delay_ms" = "1"
+ register "generic.enable_gpio" =
+ "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_144)"
+ register "generic.enable_delay_ms" = "6"
+ register "generic.stop_gpio" =
+ "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPIO_74)"
+ register "generic.stop_off_delay_ms" = "1"
+ register "generic.has_power_resource" = "1"
+ register "hid_desc_reg_offset" = "0x01"
+ device i2c 0x10 on end
+ end
+ end # I2C1
device ref i2c_3 on
chip drivers/i2c/generic
register "hid" = ""RTL5682""