sunxi: Add support for AXP305 PMIC

This PMIC can be found on H616 boards and it's very similar to AXP805
and AXP806.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

arch/arm/mach-sunxi/pmic_bus.c

@@ -18,6 +18,8 @@
 
 #define AXP209_I2C_ADDR			0x34
 
+#define AXP305_I2C_ADDR			0x36
+
 #define AXP221_CHIP_ADDR		0x68
 #define AXP221_CTRL_ADDR		0x3e
 #define AXP221_INIT_DATA		0x3e
@@ -64,6 +66,8 @@ int pmic_bus_read(u8 reg, u8 *data)
 	return i2c_read(AXP152_I2C_ADDR, reg, 1, data, 1);
 #elif defined CONFIG_AXP209_POWER
 	return i2c_read(AXP209_I2C_ADDR, reg, 1, data, 1);
+#elif defined CONFIG_AXP305_POWER
+	return i2c_read(AXP305_I2C_ADDR, reg, 1, data, 1);
 #elif defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || defined CONFIG_AXP818_POWER
 # ifdef CONFIG_MACH_SUN6I
 	return p2wi_read(reg, data);
@@ -81,6 +85,8 @@ int pmic_bus_write(u8 reg, u8 data)
 	return i2c_write(AXP152_I2C_ADDR, reg, 1, &data, 1);
 #elif defined CONFIG_AXP209_POWER
 	return i2c_write(AXP209_I2C_ADDR, reg, 1, &data, 1);
+#elif defined CONFIG_AXP305_POWER
+	return i2c_write(AXP305_I2C_ADDR, reg, 1, &data, 1);
 #elif defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || defined CONFIG_AXP818_POWER
 # ifdef CONFIG_MACH_SUN6I
 	return p2wi_write(reg, data);

board/sunxi/board.c

@@ -645,16 +645,18 @@ void sunxi_board_init(void)
 #endif
 
 #if defined CONFIG_AXP152_POWER || defined CONFIG_AXP209_POWER || \
-	defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || \
-	defined CONFIG_AXP818_POWER
+	defined CONFIG_AXP221_POWER || defined CONFIG_AXP305_POWER || \
+	defined CONFIG_AXP809_POWER || defined CONFIG_AXP818_POWER
 	power_failed = axp_init();
 
 #if defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || \
 	defined CONFIG_AXP818_POWER
 	power_failed |= axp_set_dcdc1(CONFIG_AXP_DCDC1_VOLT);
 #endif
+#if !defined(CONFIG_AXP305_POWER)
 	power_failed |= axp_set_dcdc2(CONFIG_AXP_DCDC2_VOLT);
 	power_failed |= axp_set_dcdc3(CONFIG_AXP_DCDC3_VOLT);
+#endif
 #if !defined(CONFIG_AXP209_POWER) && !defined(CONFIG_AXP818_POWER)
 	power_failed |= axp_set_dcdc4(CONFIG_AXP_DCDC4_VOLT);
 #endif
@@ -667,8 +669,10 @@ void sunxi_board_init(void)
 	defined CONFIG_AXP818_POWER
 	power_failed |= axp_set_aldo1(CONFIG_AXP_ALDO1_VOLT);
 #endif
+#if !defined(CONFIG_AXP305_POWER)
 	power_failed |= axp_set_aldo2(CONFIG_AXP_ALDO2_VOLT);
-#if !defined(CONFIG_AXP152_POWER)
+#endif
+#if !defined(CONFIG_AXP152_POWER) && !defined(CONFIG_AXP305_POWER)
 	power_failed |= axp_set_aldo3(CONFIG_AXP_ALDO3_VOLT);
 #endif
 #ifdef CONFIG_AXP209_POWER

drivers/power/Kconfig

@@ -48,6 +48,15 @@ config AXP221_POWER
 	Select this to enable support for the axp221/axp223 pmic found on most
 	A23 and A31 boards.
 
+config AXP305_POWER
+	bool "axp305 pmic support"
+	depends on MACH_SUN50I_H616
+	select AXP_PMIC_BUS
+	select CMD_POWEROFF
+	---help---
+	Select this to enable support for the axp305 pmic found on most
+	H616 boards.
+
 config AXP809_POWER
 	bool "axp809 pmic support"
 	depends on MACH_SUN9I
@@ -127,11 +136,12 @@ config AXP_DCDC3_VOLT
 
 config AXP_DCDC4_VOLT
 	int "axp pmic dcdc4 voltage"
-	depends on AXP152_POWER || AXP221_POWER || AXP809_POWER || AXP818_POWER
+	depends on AXP152_POWER || AXP221_POWER || AXP809_POWER || AXP818_POWER || AXP305_POWER
 	default 1250 if AXP152_POWER
 	default 1200 if MACH_SUN6I
 	default 0 if MACH_SUN8I
 	default 900 if MACH_SUN9I
+	default 1500 if AXP305_POWER
 	---help---
 	Set the voltage (mV) to program the axp pmic dcdc4 at, set to 0 to
 	disable dcdc4.
@@ -140,6 +150,7 @@ config AXP_DCDC4_VOLT
 	On A23 / A33 boards dcdc4 is unused and should be disabled.
 	On A80 boards dcdc4 powers VDD-SYS, HDMI, USB OTG and should be 0.9V.
 	On A83T boards dcdc4 is used for VDD-GPU.
+	On H616 boards dcdcd is used for VCC-DRAM.
 
 config AXP_DCDC5_VOLT
 	int "axp pmic dcdc5 voltage"

drivers/power/Makefile

@@ -6,6 +6,7 @@
 obj-$(CONFIG_AXP152_POWER)	+= axp152.o
 obj-$(CONFIG_AXP209_POWER)	+= axp209.o
 obj-$(CONFIG_AXP221_POWER)	+= axp221.o
+obj-$(CONFIG_AXP305_POWER)	+= axp305.o
 obj-$(CONFIG_AXP809_POWER)	+= axp809.o
 obj-$(CONFIG_AXP818_POWER)	+= axp818.o
 obj-$(CONFIG_EXYNOS_TMU)	+= exynos-tmu.o

drivers/power/axp305.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AXP305 driver
+ *
+ * (C) Copyright 2020 Jernej Skrabec <jernej.skrabec@siol.net>
+ *
+ * Based on axp221.c
+ * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
+ * (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <errno.h>
+#include <asm/arch/pmic_bus.h>
+#include <axp_pmic.h>
+
+#define AXP305_DCDC4_1600MV_OFFSET 46
+
+static u8 axp305_mvolt_to_cfg(int mvolt, int min, int max, int div)
+{
+	if (mvolt < min)
+		mvolt = min;
+	else if (mvolt > max)
+		mvolt = max;
+
+	return  (mvolt - min) / div;
+}
+
+int axp_set_dcdc4(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg;
+
+	if (mvolt >= 1600)
+		cfg = AXP305_DCDC4_1600MV_OFFSET +
+			axp305_mvolt_to_cfg(mvolt, 1600, 3300, 100);
+	else
+		cfg = axp305_mvolt_to_cfg(mvolt, 600, 1500, 20);
+
+	if (mvolt == 0)
+		return pmic_bus_clrbits(AXP305_OUTPUT_CTRL1,
+					AXP305_OUTPUT_CTRL1_DCDCD_EN);
+
+	ret = pmic_bus_write(AXP305_DCDCD_VOLTAGE, cfg);
+	if (ret)
+		return ret;
+
+	return pmic_bus_setbits(AXP305_OUTPUT_CTRL1,
+				AXP305_OUTPUT_CTRL1_DCDCD_EN);
+}
+
+int axp_init(void)
+{
+	u8 axp_chip_id;
+	int ret;
+
+	ret = pmic_bus_init();
+	if (ret)
+		return ret;
+
+	ret = pmic_bus_read(AXP305_CHIP_VERSION, &axp_chip_id);
+	if (ret)
+		return ret;
+
+	if ((axp_chip_id & AXP305_CHIP_VERSION_MASK) != 0x40)
+		return -ENODEV;
+
+	return ret;
+}
+
+#ifndef CONFIG_PSCI_RESET
+int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	pmic_bus_write(AXP305_SHUTDOWN, AXP305_POWEROFF);
+
+	/* infinite loop during shutdown */
+	while (1) {}
+
+	/* not reached */
+	return 0;
+}
+#endif

include/axp305.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2020 Jernej Skrabec <jernej.skrabec@siol.net>
+ */
+
+enum axp305_reg {
+	AXP305_CHIP_VERSION = 0x3,
+	AXP305_OUTPUT_CTRL1 = 0x10,
+	AXP305_DCDCD_VOLTAGE = 0x15,
+	AXP305_SHUTDOWN = 0x32,
+};
+
+#define AXP305_CHIP_VERSION_MASK	0xcf
+
+#define AXP305_OUTPUT_CTRL1_DCDCD_EN	(1 << 3)
+
+#define AXP305_POWEROFF			(1 << 7)

include/axp_pmic.h

@@ -15,6 +15,9 @@
 #ifdef CONFIG_AXP221_POWER
 #include <axp221.h>
 #endif
+#ifdef CONFIG_AXP305_POWER
+#include <axp305.h>
+#endif
 #ifdef CONFIG_AXP809_POWER
 #include <axp809.h>
 #endif