mb/google/bluey: Add parallel charging infrastructure

Add support for parallel charging by configuring PMC8380F GPIO07
and GPIO09. These GPIOs are configured as outputs with inverted
logic. A new Kconfig option MAINBOARD_SUPPORTS_PARALLEL_CHARGING
is introduced to allow variants to opt-in to this configuration.

BUG=b:468120472
TEST=Build Google/Quartz.

Change-Id: I0126d987650c660e305f704708c09356908633e4
Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90514
Reviewed-by: Pranava Y N <pranavayn@google.com>
Reviewed-by: Jayvik Desai <jayvik@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/bluey/Kconfig

@@ -94,6 +94,12 @@ config MAINBOARD_NO_USB_A_PORT
 	help
 	  Enable this option if your mainboard is not equipped with USB-A port.
 
+config MAINBOARD_SUPPORTS_PARALLEL_CHARGING
+	bool
+	default n
+	help
+	  Enable this option if your mainboard supports parallel charging.
+
 config MAINBOARD_HAS_GOOGLE_TPM
 	bool
 	default n

src/mainboard/google/bluey/board.h

@@ -42,6 +42,7 @@
 
 void setup_chromeos_gpios(void);
 bool is_off_mode(void);
+void configure_parallel_charging(void);
 void enable_slow_battery_charging(void);
 void disable_slow_battery_charging(void);
 

src/mainboard/google/bluey/charging.c

@@ -21,6 +21,35 @@ enum charging_status {
 	CHRG_ENABLE,
 };
 
+#define PMC8380F_SLAVE_ID	0x05
+#define GPIO07_MODE_CTL			0x8E40
+#define GPIO07_DIG_OUT_SOURCE_CTL	0x8E44
+#define GPIO07_EN_CTL			0x8E46
+#define GPIO09_MODE_CTL			0x9040
+#define GPIO09_DIG_OUT_SOURCE_CTL	0x9044
+#define GPIO09_EN_CTL			0x9046
+
+#define MODE_OUTPUT		0x01
+#define OUTPUT_INVERT		0x80
+#define PERPH_EN		0x80
+
+/*
+ * Enable PMC8380F GPIO07 & GPIO09 for parallel charging.
+ */
+void configure_parallel_charging(void)
+{
+	if (!CONFIG(MAINBOARD_SUPPORTS_PARALLEL_CHARGING))
+		return;
+
+	printk(BIOS_INFO, "Configure parallel charging support\n");
+	spmi_write8(SPMI_ADDR(PMC8380F_SLAVE_ID, GPIO07_MODE_CTL), MODE_OUTPUT);
+	spmi_write8(SPMI_ADDR(PMC8380F_SLAVE_ID, GPIO07_DIG_OUT_SOURCE_CTL), OUTPUT_INVERT);
+	spmi_write8(SPMI_ADDR(PMC8380F_SLAVE_ID, GPIO07_EN_CTL), PERPH_EN);
+	spmi_write8(SPMI_ADDR(PMC8380F_SLAVE_ID, GPIO09_MODE_CTL), MODE_OUTPUT);
+	spmi_write8(SPMI_ADDR(PMC8380F_SLAVE_ID, GPIO09_DIG_OUT_SOURCE_CTL), OUTPUT_INVERT);
+	spmi_write8(SPMI_ADDR(PMC8380F_SLAVE_ID, GPIO09_EN_CTL), PERPH_EN);
+}
+
 /*
  * Enable charging w/ 1A Icurrent supply at max.
  */

src/mainboard/google/bluey/mainboard.c

@@ -85,6 +85,8 @@ static void display_startup(void)
 
 static void mainboard_init(struct device *dev)
 {
+	configure_parallel_charging();
+
 	/* Skip mainboard initialization if boot mode is "low-battery" or "off-mode charging"*/
 	if (is_low_power_boot())
 		return;