mainboard/google/poppy/variants/rammus: Enable touchscreen
On rammus, set GPIO GPP_C22 to 1 for touchscreen power on.
And add touchscreen device "PNP0C50" to I2C0.
According to touchscreen spec, device power on initialization takes
105 ms, so set "generic.enable_delay_ms" to 120.
We found there is i2c error log pop up when we set delay
time to be 110ms or 105ms. If we set delay time to be
120ms. System will not pop up i2c error log.
BUG=b:115944726
BRANCH=master
TEST=emerge-rammus coreboot chromeos-ec chromeos-bootimage
Flash FW to DUT, and make sure touchscreen works.
Change-Id: Ibce552d04991e85c99ae3a0a92455fc747d9fced
Signed-off-by: YanRu Chen <kane_chen@pegatron.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/28598
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/poppy/variants/rammus/devicetree.cb b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
index b750cb8..f10b84d 100644
--- a/src/mainboard/google/poppy/variants/rammus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
@@ -257,7 +257,20 @@
device pci 14.0 on end # USB xHCI
device pci 14.1 on end # USB xDCI (OTG)
device pci 14.2 on end # Thermal Subsystem
- device pci 15.0 on end # I2C #0
+ device pci 15.0 on
+ chip drivers/i2c/hid
+ register "generic.hid" = ""PNP0C50""
+ register "generic.desc" = ""SISC Touchscreen""
+ register "generic.irq" = "ACPI_IRQ_LEVEL_LOW(GPP_E7_IRQ)"
+ register "generic.probed" = "1"
+ register "generic.enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_C22)"
+ register "generic.enable_delay_ms" = "120"
+ register "generic.has_power_resource" = "1"
+ register "generic.disable_gpio_export_in_crs" = "1"
+ register "hid_desc_reg_offset" = "0x0"
+ device i2c 5c on end
+ end
+ end # I2C #0
device pci 15.1 on
chip drivers/i2c/generic
register "hid" = ""ELAN0000""