[coreboot-gerrit] Change in coreboot[master]: mb/system76/lemp9: enable I2C HID touchpad

[Jeremy Soller (Code Review)]

Jeremy Soller has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/43623 )

Change subject: mb/system76/lemp9: enable I2C HID touchpad
......................................................................

mb/system76/lemp9: enable I2C HID touchpad

Tested on lemp9, touchpad confirmed to use I2C HID

Signed-off-by: Jeremy Soller 
Change-Id: Ic3a90fda134b1d53f28ab687b3033ec52fee843b
---
M src/mainboard/system76/lemp9/Kconfig
M src/mainboard/system76/lemp9/devicetree.cb
M src/mainboard/system76/lemp9/gpio.h
3 files changed, 34 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/23/43623/1

diff --git a/src/mainboard/system76/lemp9/Kconfig b/src/mainboard/system76/lemp9/Kconfig
index dd5359e..c606d91 100644
--- a/src/mainboard/system76/lemp9/Kconfig
+++ b/src/mainboard/system76/lemp9/Kconfig
@@ -3,6 +3,7 @@
 config BOARD_SPECIFIC_OPTIONS
    def_bool y
    select BOARD_ROMSIZE_KB_16384
+	select DRIVERS_I2C_HID
    select EC_SYSTEM76_EC
    select HAVE_ACPI_RESUME
    select HAVE_ACPI_TABLES
diff --git a/src/mainboard/system76/lemp9/devicetree.cb b/src/mainboard/system76/lemp9/devicetree.cb
index 25ae62f..27f5efb 100644
--- a/src/mainboard/system76/lemp9/devicetree.cb
+++ b/src/mainboard/system76/lemp9/devicetree.cb
@@ -2,6 +2,11 @@
    # Lock Down
    register "common_soc_config" = "{
    	.chipset_lockdown = CHIPSET_LOCKDOWN_COREBOOT,
+		.i2c[0] = {
+			.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 80,
+			.fall_time_ns = 110,
+		},
    }"

# Send an extra VR mailbox command for the PS4 exit issue
@@ -35,6 +40,22 @@
    #register "enable_c6dram" = "1"

# FSP Silicon (soc/intel/cannonlake/fsp_params.c)
+	# Serial I/O
+	register "SerialIoDevMode" = "{
+		[PchSerialIoIndexI2C0] = PchSerialIoPci,
+		[PchSerialIoIndexI2C1] = PchSerialIoDisabled,
+		[PchSerialIoIndexI2C2] = PchSerialIoPci,
+		[PchSerialIoIndexI2C3] = PchSerialIoDisabled,
+		[PchSerialIoIndexI2C4] = PchSerialIoDisabled,
+		[PchSerialIoIndexI2C5] = PchSerialIoDisabled,
+		[PchSerialIoIndexSPI0] = PchSerialIoDisabled,
+		[PchSerialIoIndexSPI1] = PchSerialIoDisabled,
+		[PchSerialIoIndexSPI2] = PchSerialIoDisabled,
+		[PchSerialIoIndexUART0] = PchSerialIoDisabled,
+		[PchSerialIoIndexUART1] = PchSerialIoDisabled,
+		[PchSerialIoIndexUART2] = PchSerialIoPci,
+	}"
+
    # SATA
    register "SataMode" = "Sata_AHCI"
    register "SataSalpSupport" = "0"
@@ -194,7 +215,16 @@
    		device pci 14.3 on  end # CNVi wifi
    	#end
    	device pci 14.5 off end # SDCard
-		device pci 15.0 off end # I2C #0
+		device pci 15.0 on
+			chip drivers/i2c/hid
+				register "generic.hid" = ""PNP0C50""
+				register "generic.desc" = ""ELAN Touchpad""
+				register "generic.irq" = "ACPI_IRQ_EDGE_LOW(GPP_B3_IRQ)"
+				register "generic.probed" = "1"
+				register "hid_desc_reg_offset" = "0x01"
+				device i2c 15 on end
+			end
+		end # I2C #0
    	device pci 15.1 off end # I2C #1
    	device pci 15.2 off end # I2C #2
    	device pci 15.3 off end # I2C #3
diff --git a/src/mainboard/system76/lemp9/gpio.h b/src/mainboard/system76/lemp9/gpio.h
index d06145d..e71197c 100644
--- a/src/mainboard/system76/lemp9/gpio.h
+++ b/src/mainboard/system76/lemp9/gpio.h
@@ -139,8 +139,8 @@
    	PAD_CFG_NC(GPP_B2),

// CPU Misc
-		// GPP_B3
-		_PAD_CFG_STRUCT(GPP_B3, 0x80100100, 0x0000),
+		// GPP_B3 (touchpad interrupt)
+		PAD_CFG_GPI_APIC(GPP_B3, NONE, PLTRST, EDGE_SINGLE, INVERT),
    	// NC
    	PAD_CFG_NC(GPP_B4),