pinephone-pro: Perform PMIC setup on boot (increase input current limit)

The limit needs to be raised to prevent bootloops on empty battery.

(This is a bit too late for battery-less boot, it would need to be done
in TPL very early on, for that) This is still slightly better than nothing,
though.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Origin: https://xff.cz/git/u-boot/commit/?h=ppp&id=7f8238fd608290152b143322178a5be21a447dc1

Author: Ondrej Jirman

arch/arm/mach-rockchip/board.c

@@ -187,10 +187,16 @@ int board_late_init(void)
 	return rk_board_late_init();
 }
 
+void __weak pmic_setup(void)
+{
+}
+
 int board_init(void)
 {
 	int ret;
 
+	pmic_setup();
+
 #ifdef CONFIG_DM_REGULATOR
 	ret = regulators_enable_boot_on(false);
 	if (ret)

board/pine64/pinephone-pro-rk3399/pinephone-pro-rk3399.c

@@ -17,6 +17,7 @@
 #include <asm/arch-rockchip/misc.h>
 #include <power/regulator.h>
 #include <linux/delay.h>
+#include <power/rk8xx_pmic.h>
 
 #define GRF_IO_VSEL_BT565_GPIO2AB 1
 #define GRF_IO_VSEL_AUDIO_GPIO3D4A 2
@@ -108,3 +109,42 @@ void led_setup(void)
 }
 
 #endif
+
+static void pinephone_pro_init(void)
+{
+	struct udevice *pmic;
+	int ret;
+
+	printf("Initializing Pinephone Pro charger\n");
+
+	ret = uclass_first_device_err(UCLASS_PMIC, &pmic);
+	if (ret) {
+		printf("ERROR: PMIC not found! (%d)\n", ret);
+		return;
+	}
+
+	/*
+	 * Raise input current limit to 1.5A, which is a standard CDC charger
+	 * allowance.
+	 */
+	ret = rk818_spl_configure_usb_input_current(pmic, 1500);
+	if (ret)
+		printf("ERROR: Input current limit setup failed!\n");
+
+	/*
+	 * Close charger when USB lower then 3.26V
+	 */
+	rk818_spl_configure_usb_chrg_shutdown(pmic, 3260000);
+
+	/*
+	 * Check battery voltage and wait until it's in bootable state.
+	 */
+	//TODO:
+	rk818_wait_battery(pmic);
+}
+
+void pmic_setup(void)
+{
+	if (of_machine_is_compatible("pine64,pinephone-pro"))
+		pinephone_pro_init();
+}

drivers/power/pmic/rk8xx.c

@@ -129,6 +129,11 @@ static int rk8xx_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
 	return 0;
 }
 
+int rk818_wait_battery(struct udevice *dev)
+{
+	return 0;
+}
+
 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 static int rk8xx_bind(struct udevice *dev)
 {

include/power/rk8xx_pmic.h

@@ -236,4 +236,6 @@ int rk8xx_spl_configure_buck(struct udevice *pmic, int buck, int uvolt);
 int rk818_spl_configure_usb_input_current(struct udevice *pmic, int current_ma);
 int rk818_spl_configure_usb_chrg_shutdown(struct udevice *pmic, int uvolt);
 
+int rk818_wait_battery(struct udevice *dev);
+
 #endif