power: axp818: Add support for FLDOs

The FLDOs on AXP818 PMIC normally provide power to CPUS and USB HSIC PHY
on the A83T/H8.

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>

2 files changed, 61 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 548fe2617d..937b9aa246 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -238,6 +238,33 @@ config AXP_ELDO3_VOLT
 	1.2V for the SSD2828 chip (converter of parallel LCD interface
 	into MIPI DSI).
 
+config AXP_FLDO1_VOLT
+	int "axp pmic fldo1 voltage"
+	depends on AXP818_POWER
+	default 0 if MACH_SUN8I_A83T
+	---help---
+	Set the voltage (mV) to program the axp pmic fldo1 at, set to 0 to
+	disable fldo1.
+	On A83T / H8 boards fldo1 is VCC-HSIC and should be 1.2V if HSIC is
+	used.
+
+config AXP_FLDO2_VOLT
+	int "axp pmic eldo2 voltage"
+	depends on AXP818_POWER
+	default 900 if MACH_SUN8I_A83T
+	---help---
+	Set the voltage (mV) to program the axp pmic fldo2 at, set to 0 to
+	disable fldo2.
+	On A83T / H8 boards fldo2 is VCC-CPUS and should be 0.9V.
+
+config AXP_FLDO3_VOLT
+	int "axp pmic fldo3 voltage"
+	depends on AXP818_POWER
+	default 0
+	---help---
+	Set the voltage (mV) to program the axp pmic fldo3 at, set to 0 to
+	disable fldo3.
+
 config SY8106A_VOUT1_VOLT
 	int "SY8106A pmic VOUT1 voltage"
 	depends on SY8106A_POWER
diff --git a/drivers/power/axp818.c b/drivers/power/axp818.c
index e885d02984..3ac05ffefe 100644
--- a/drivers/power/axp818.c
+++ b/drivers/power/axp818.c
@@ -191,6 +191,40 @@ int axp_set_eldo(int eldo_num, unsigned int mvolt)
 				AXP818_OUTPUT_CTRL2_ELDO1_EN << (eldo_num - 1));
 }
 
+int axp_set_fldo(int fldo_num, unsigned int mvolt)
+{
+	int ret;
+	u8 cfg;
+
+	if (fldo_num < 1 || fldo_num > 3)
+		return -EINVAL;
+
+	if (mvolt == 0)
+		return pmic_bus_clrbits(AXP818_OUTPUT_CTRL3,
+				AXP818_OUTPUT_CTRL3_FLDO1_EN << (fldo_num - 1));
+
+	if (fldo_num < 3) {
+		cfg = axp818_mvolt_to_cfg(mvolt, 700, 1450, 50);
+		ret = pmic_bus_write(AXP818_FLDO1_CTRL + (fldo_num - 1), cfg);
+	} else {
+		/*
+		 * Special case for FLDO3, which is DCDC5 / 2 or FLDOIN / 2
+		 * Since FLDOIN is unknown, test against DCDC5.
+		 */
+		if (mvolt * 2 == CONFIG_AXP_DCDC5_VOLT)
+			ret = pmic_bus_clrbits(AXP818_FLDO2_3_CTRL,
+					       AXP818_FLDO2_3_CTRL_FLDO3_VOL);
+		else
+			ret = pmic_bus_setbits(AXP818_FLDO2_3_CTRL,
+					       AXP818_FLDO2_3_CTRL_FLDO3_VOL);
+	}
+	if (ret)
+		return ret;
+
+	return pmic_bus_setbits(AXP818_OUTPUT_CTRL3,
+				AXP818_OUTPUT_CTRL3_FLDO1_EN << (fldo_num - 1));
+}
+
 int axp_init(void)
 {
 	u8 axp_chip_id;