From beb0951c1c56e15ac51adc66ccae3b306bd92e9f Mon Sep 17 00:00:00 2001
From: Varun Upadhyay <varun.upadhyay@intel.com>
Date: Tue, 23 Sep 2025 20:07:33 +0530
Subject: [PATCH] mb/google/ocelot/var/ojal: Update touchpad config

This patch enables ELAN touchpad in devicetree on I2C0 interface and updates FW config for GPIO's according to schematics revision 0.9.
Intel RDC kit no:840138

BUG=b:437459757
TEST=Build ojal board and test trackpad functionality

Change-Id: Idf84165877e98df31f71c8df916637a455ce84dc
Signed-off-by: Varun Upadhyay <varun.upadhyay@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89323
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Pranava Y N <pranavayn@google.com>
---
 .../google/ocelot/variants/ojal/fw_config.c   | 28 ++++++++++++++++
 .../ocelot/variants/ojal/overridetree.cb      | 32 ++++++++++++++-----
 2 files changed, 52 insertions(+), 8 deletions(-)

diff --git a/src/mainboard/google/ocelot/variants/ojal/fw_config.c b/src/mainboard/google/ocelot/variants/ojal/fw_config.c
index a658e76542..d374cf1dba 100644
--- a/src/mainboard/google/ocelot/variants/ojal/fw_config.c
+++ b/src/mainboard/google/ocelot/variants/ojal/fw_config.c
@@ -71,6 +71,28 @@ static const struct pad_config cnvi_disable_pads[] = {
 	PAD_NC(GPP_F05, NONE),
 };
 
+static const struct pad_config touchpad_lpss_i2c_enable_pads[] = {
+	/* GPP_H20:     SOC_I2C_0_SCL */
+	PAD_CFG_NF(GPP_H20, NONE, DEEP, NF1),
+	/* GPP_H19:     SOC_I2C_0_SDA */
+	PAD_CFG_NF(GPP_H19, NONE, DEEP, NF1),
+	/* GPP_A13:     TCH_PAD_INT_N */
+	PAD_CFG_GPI_APIC(GPP_A13, NONE, PLTRST, LEVEL, INVERT),
+	/* GPP_VGPIO3_THC1: THC1_WOT */
+	PAD_NC(GPP_VGPIO3_THC1, NONE),
+};
+
+static const struct pad_config touchpad_i2c_disable_pads[] = {
+	/* GPP_H20:     SOC_I2C_0_SCL */
+	PAD_NC(GPP_H20, NONE),
+	/* GPP_H19:     SOC_I2C_0_SDA */
+	PAD_NC(GPP_H19, NONE),
+	/* GPP_A13:     TCH_PAD_INT_N */
+	PAD_NC(GPP_A13, NONE),
+	/* GPP_VGPIO3_THC1: THC1_WOT */
+	PAD_NC(GPP_VGPIO3_THC1, NONE),
+};
+
 void fw_config_configure_pre_mem_gpio(void)
 {
 	if (!fw_config_is_provisioned()) {
@@ -109,4 +131,10 @@ void fw_config_gpio_padbased_override(struct pad_config *padbased_table)
 	} else if (fw_config_probe(FW_CONFIG(WIFI, WIFI_NONE)))  {
 		GPIO_PADBASED_OVERRIDE(padbased_table, cnvi_disable_pads);
 	}
+
+	if (fw_config_probe(FW_CONFIG(TOUCHPAD, TOUCHPAD_LPSS_I2C))) {
+		GPIO_PADBASED_OVERRIDE(padbased_table, touchpad_lpss_i2c_enable_pads);
+	} else {
+		GPIO_PADBASED_OVERRIDE(padbased_table, touchpad_i2c_disable_pads);
+	}
 }
diff --git a/src/mainboard/google/ocelot/variants/ojal/overridetree.cb b/src/mainboard/google/ocelot/variants/ojal/overridetree.cb
index 4394314a24..bf174848ef 100644
--- a/src/mainboard/google/ocelot/variants/ojal/overridetree.cb
+++ b/src/mainboard/google/ocelot/variants/ojal/overridetree.cb
@@ -56,6 +56,11 @@ chip soc/intel/pantherlake
 	register "tcss_cap_policy[0]" = "TCSS_TYPE_C_PORT_FULL_FUN"
 	register "tcss_cap_policy[1]" = "TCSS_TYPE_C_PORT_FULL_FUN"
 
+	#gpe configuration
+	register "pmc_gpe0_dw0" = "GPP_A"
+	register "pmc_gpe0_dw1" = "GPP_B"
+	register "pmc_gpe0_dw2" = "GPP_E"
+
 	# Enable EDP in PortA & HDMI in Port B
 	register "ddi_port_A_config" = "1"
 	register "ddi_port_B_config" = "1"
@@ -70,7 +75,7 @@ chip soc/intel/pantherlake
 		[PchSerialIoIndexI2C2]  = PchSerialIoDisabled,
 		[PchSerialIoIndexI2C3]  = PchSerialIoDisabled,
 		[PchSerialIoIndexI2C4]  = PchSerialIoDisabled,
-		[PchSerialIoIndexI2C5]  = PchSerialIoPci,
+		[PchSerialIoIndexI2C5]  = PchSerialIoDisabled,
 	}"
 
 	register "serial_io_gspi_mode" = "{
@@ -90,13 +95,13 @@ chip soc/intel/pantherlake
 		/* Render OEM footer logo 100px above from the edge */
 		.logo_bottom_margin = 100,
 		.chipset_lockdown = CHIPSET_LOCKDOWN_COREBOOT,
+		.i2c[0] = {
+			.speed = I2C_SPEED_FAST,
+		},
 		.i2c[1] = {
-			.speed = I2C_SPEED_FAST,
-			.early_init = 1,
-		},
-		.i2c[5] = {
-			.speed = I2C_SPEED_FAST,
-		},
+                        .speed = I2C_SPEED_FAST,
+                        .early_init = 1,
+                },
 	}"
 
 	device domain 0 on
@@ -258,7 +263,18 @@ chip soc/intel/pantherlake
 			probe WIFI WIFI_CNVI_7
 		end
 
-		device ref i2c0 on end
+		device ref i2c0 on
+			chip drivers/i2c/generic
+				register "hid" = ""ELAN0000""
+				register "desc" = ""ELAN Touchpad""
+				register "irq" = "ACPI_IRQ_WAKE_LEVEL_LOW(GPP_A13_IRQ)"
+				register "wake" = "GPE0_DW0_13"
+				register "detect" = "1"
+				device i2c 15 on
+					probe TOUCHPAD TOUCHPAD_LPSS_I2C
+				end
+			end
+		end
 
 		device ref i2c1 on
 			chip drivers/i2c/tpm