sunxi: power: axp818: Add support for switch SW

The AXP818 has a switchable output, SW. This is commonly used for
controlling power to the LCD backlight.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

board/sunxi/board.c

@@ -523,6 +523,7 @@ void sunxi_board_init(void)
 	power_failed |= axp_set_fldo(1, CONFIG_AXP_FLDO1_VOLT);
 	power_failed |= axp_set_fldo(2, CONFIG_AXP_FLDO2_VOLT);
 	power_failed |= axp_set_fldo(3, CONFIG_AXP_FLDO3_VOLT);
+	power_failed |= axp_set_sw(IS_ENABLED(CONFIG_AXP_SW_ON));
 #endif
 #endif
 	printf("DRAM:");

drivers/power/Kconfig

@@ -265,6 +265,13 @@ config AXP_FLDO3_VOLT
 	Set the voltage (mV) to program the axp pmic fldo3 at, set to 0 to
 	disable fldo3.
 
+config AXP_SW_ON
+	bool "axp pmic sw on"
+	depends on AXP818_POWER
+	default n
+	---help---
+	Enable to turn on axp pmic sw.
+
 config SY8106A_VOUT1_VOLT
 	int "SY8106A pmic VOUT1 voltage"
 	depends on SY8106A_POWER

drivers/power/axp818.c

@@ -225,6 +225,16 @@ int axp_set_fldo(int fldo_num, unsigned int mvolt)
 				AXP818_OUTPUT_CTRL3_FLDO1_EN << (fldo_num - 1));
 }
 
+int axp_set_sw(bool on)
+{
+	if (on)
+		return pmic_bus_setbits(AXP818_OUTPUT_CTRL2,
+					AXP818_OUTPUT_CTRL2_SW_EN);
+
+	return pmic_bus_clrbits(AXP818_OUTPUT_CTRL2,
+				AXP818_OUTPUT_CTRL2_SW_EN);
+}
+
 int axp_init(void)
 {
 	u8 axp_chip_id;

include/axp818.h

@@ -24,6 +24,7 @@
 #define AXP818_OUTPUT_CTRL2_DLDO2_EN	(1 << 4)
 #define AXP818_OUTPUT_CTRL2_DLDO3_EN	(1 << 5)
 #define AXP818_OUTPUT_CTRL2_DLDO4_EN	(1 << 6)
+#define AXP818_OUTPUT_CTRL2_SW_EN	(1 << 7)
 #define AXP818_OUTPUT_CTRL3	0x13
 #define AXP818_OUTPUT_CTRL3_FLDO1_EN	(1 << 2)
 #define AXP818_OUTPUT_CTRL3_FLDO2_EN	(1 << 3)

include/axp_pmic.h

@@ -32,6 +32,7 @@ int axp_set_aldo4(unsigned int mvolt);
 int axp_set_dldo(int dldo_num, unsigned int mvolt);
 int axp_set_eldo(int eldo_num, unsigned int mvolt);
 int axp_set_fldo(int fldo_num, unsigned int mvolt);
+int axp_set_sw(bool on);
 int axp_init(void);
 int axp_get_sid(unsigned int *sid);