From 16cb8d0d0c9b29322f646755c62a14ce29473a04 Mon Sep 17 00:00:00 2001
From: Subrata Banik <subratabanik@google.com>
Date: Thu, 8 Jan 2026 16:41:02 +0530
Subject: [PATCH] mb/google/bluey: Add power sequencing for USB-C1 retimer

This patch implements the power-on and reset sequence for the USB-C1
retimer on the Bluey mainboard.

Sequence Details:
 - romstage: Added early_setup_usb_typec to ensure all power rails
   (3.3V, 1.8V, 0.9V) are disabled and the retimer is held in reset
   early in the boot process.
 - ramstage (mainboard): Added setup_usb_typec to perform the power-up
   sequence with the required 1ms delays between rails to ensure
   hardware stability:

BUG=b:473489095
TEST=Able to detect USB devices in HS mode.

Change-Id: Ia93c0078aecdec98f3af28e73e7af5af7a3b20d8
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90699
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Pranava Y N <pranavayn@google.com>
Reviewed-by: Jayvik Desai <jayvik@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
---
 src/mainboard/google/bluey/board.h     |  6 ++++++
 src/mainboard/google/bluey/mainboard.c | 14 ++++++++++++++
 src/mainboard/google/bluey/romstage.c  | 16 ++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/src/mainboard/google/bluey/board.h b/src/mainboard/google/bluey/board.h
index 3260b283c7..3d42d89a48 100644
--- a/src/mainboard/google/bluey/board.h
+++ b/src/mainboard/google/bluey/board.h
@@ -44,6 +44,12 @@
 #define GPIO_USB_CAM_RESET_L	GPIO(10)
 #define GPIO_USB_CAM_ENABLE	GPIO(206)
 
+/* USB-C1 port specific GPIOs */
+#define GPIO_USB_C1_EN_PP3300		GPIO(186)
+#define GPIO_USB_C1_EN_PP1800		GPIO(175)
+#define GPIO_USB_C1_EN_PP0900		GPIO(188)
+#define GPIO_USB_C1_RETIMER_RESET_L	GPIO(176)
+
 void setup_chromeos_gpios(void);
 bool is_off_mode(void);
 void configure_parallel_charging(void);
diff --git a/src/mainboard/google/bluey/mainboard.c b/src/mainboard/google/bluey/mainboard.c
index b93b4188db..b37c0b1e8a 100644
--- a/src/mainboard/google/bluey/mainboard.c
+++ b/src/mainboard/google/bluey/mainboard.c
@@ -6,6 +6,7 @@
 #include <commonlib/bsd/cbmem_id.h>
 #include <commonlib/coreboot_tables.h>
 #include <console/console.h>
+#include <delay.h>
 #include <device/device.h>
 #include <ec/google/chromeec/ec.h>
 #include <gpio.h>
@@ -50,8 +51,21 @@ static void enable_usb_camera(void)
 	gpio_output(GPIO_USB_CAM_ENABLE, 1);
 }
 
+static void setup_usb_typec(void)
+{
+	gpio_output(GPIO_USB_C1_EN_PP3300, 1);
+	mdelay(1);
+	gpio_output(GPIO_USB_C1_EN_PP1800, 1);
+	mdelay(1);
+	gpio_output(GPIO_USB_C1_EN_PP0900, 1);
+	mdelay(1);
+	gpio_output(GPIO_USB_C1_RETIMER_RESET_L, 1);
+}
+
 static void setup_usb(void)
 {
+	setup_usb_typec();
+
 	enable_usb_camera();
 	setup_usb_host0();
 }
diff --git a/src/mainboard/google/bluey/romstage.c b/src/mainboard/google/bluey/romstage.c
index 1c6660112e..e0f1f05743 100644
--- a/src/mainboard/google/bluey/romstage.c
+++ b/src/mainboard/google/bluey/romstage.c
@@ -86,6 +86,19 @@ static void platform_dump_battery_soc_information(void)
 		printk(BIOS_INFO, "Battery state-of-charge %d%%\n", batt_pct);
 }
 
+static void early_setup_usb_typec(void)
+{
+	gpio_output(GPIO_USB_C1_RETIMER_RESET_L, 0);
+	gpio_output(GPIO_USB_C1_EN_PP3300, 0);
+	gpio_output(GPIO_USB_C1_EN_PP1800, 0);
+	gpio_output(GPIO_USB_C1_EN_PP0900, 0);
+}
+
+static void early_setup_usb(void)
+{
+	early_setup_usb_typec();
+}
+
 void platform_romstage_main(void)
 {
 	/* Watchdog must be checked first to avoid erasing watchdog info later. */
@@ -107,6 +120,9 @@ void platform_romstage_main(void)
 
 	qclib_rerun();
 
+	/* Setup early USB related config */
+	early_setup_usb();
+
 	/*
 	 * Enable this power rail now for FPMCU stability prior to
 	 * its reset being deasserted in ramstage. This applies