[U-Boot] [PATCH RFC 03/17] power: axp818: Add support for FLDOs

[Chen-Yu Tsai]

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 at csie.org>
---
 board/sunxi/board.c    |  6 ++++++
 drivers/power/Kconfig  | 27 +++++++++++++++++++++++++++
 drivers/power/axp818.c | 34 ++++++++++++++++++++++++++++++++++
 include/axp818.h       |  1 +
 include/axp_pmic.h     |  1 +
 5 files changed, 69 insertions(+)

diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 2d5335f..2271c89 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -486,6 +486,12 @@ void sunxi_board_init(void)
 	power_failed |= axp_set_eldo(2, CONFIG_AXP_ELDO2_VOLT);
 	power_failed |= axp_set_eldo(3, CONFIG_AXP_ELDO3_VOLT);
 #endif
+
+#ifdef CONFIG_AXP818_POWER
+	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);
+#endif
 #endif
 	printf("DRAM:");
 	ramsize = sunxi_dram_init();
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 548fe26..937b9aa 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 e885d02..3ac05ff 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;
diff --git a/include/axp818.h b/include/axp818.h
index c2f9847..003477f 100644
--- a/include/axp818.h
+++ b/include/axp818.h
@@ -41,6 +41,7 @@
 #define AXP818_ELDO3_CTRL	0x1b
 #define AXP818_FLDO1_CTRL	0x1c
 #define AXP818_FLDO2_3_CTRL	0x1d
+#define AXP818_FLDO2_3_CTRL_FLDO3_VOL	(1 << 4)
 #define AXP818_DCDC1_CTRL	0x20
 #define AXP818_DCDC2_CTRL	0x21
 #define AXP818_DCDC3_CTRL	0x22
diff --git a/include/axp_pmic.h b/include/axp_pmic.h
index 0f14683..b203cc8 100644
--- a/include/axp_pmic.h
+++ b/include/axp_pmic.h
@@ -31,6 +31,7 @@ int axp_set_aldo3(unsigned int mvolt);
 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_init(void);
 int axp_get_sid(unsigned int *sid);
 
-- 
2.7.0