#include <asm/arch/pmic_bus.h>
#include <axp_pmic.h>
+#ifdef CONFIG_AXP_ALDO3_VOLT_SLOPE_08
+# define AXP209_VRC_SLOPE AXP209_VRC_LDO3_800uV_uS
+#endif
+#ifdef CONFIG_AXP_ALDO3_VOLT_SLOPE_16
+# define AXP209_VRC_SLOPE AXP209_VRC_LDO3_1600uV_uS
+#endif
+#if defined CONFIG_AXP_ALDO3_VOLT_SLOPE_NONE || !defined AXP209_VRC_SLOPE
+# define AXP209_VRC_SLOPE 0x00
+#endif
+
static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
{
if (mvolt < min)
if (rc)
return rc;
- /* LDO2 configuration is in upper 4 bits */
- reg = (reg & 0x0f) | (cfg << 4);
+ reg |= AXP209_LDO24_LDO2_SET(reg, cfg);
rc = pmic_bus_write(AXP209_LDO24_VOLTAGE, reg);
if (rc)
return rc;
return pmic_bus_clrbits(AXP209_OUTPUT_CTRL,
AXP209_OUTPUT_CTRL_LDO3);
- if (mvolt == -1)
- cfg = 0x80; /* determined by LDO3IN pin */
- else
+ /*
+ * Some boards have trouble reaching the target voltage without causing
+ * great inrush currents. To prevent this, boards can enable a certain
+ * slope to ramp up voltage. Note, this only works when changing an
+ * already active power rail. When toggling power on, the AXP ramps up
+ * steeply at 0.0167 V/uS.
+ */
+ rc = pmic_bus_read(AXP209_VRC_DCDC2_LDO3, &cfg);
+ cfg = AXP209_VRC_LDO3_SLOPE_SET(cfg, AXP209_VRC_SLOPE);
+ rc |= pmic_bus_write(AXP209_VRC_DCDC2_LDO3, cfg);
+
+ if (rc)
+ return rc;
+
+#ifdef CONFIG_AXP_ALDO3_INRUSH_QUIRK
+ /*
+ * On some boards, LDO3 has a too big capacitor installed. When
+ * turning on LDO3, this causes the AXP209 to shutdown on
+ * voltages over 1.9 volt. As a workaround, we enable LDO3
+ * first with the lowest possible voltage. If this still causes
+ * high inrush currents, the voltage slope should be increased.
+ */
+ rc = pmic_bus_read(AXP209_OUTPUT_CTRL, &cfg);
+ if (rc)
+ return rc;
+
+ if (!(cfg & AXP209_OUTPUT_CTRL_LDO3)) {
+ rc = pmic_bus_write(AXP209_LDO3_VOLTAGE, 0x0); /* 0.7 Volt */
+ mdelay(1);
+ rc |= pmic_bus_setbits(AXP209_OUTPUT_CTRL,
+ AXP209_OUTPUT_CTRL_LDO3);
+
+ if (rc)
+ return rc;
+ }
+#endif
+
+ if (mvolt == -1) {
+ cfg = AXP209_LDO3_VOLTAGE_FROM_LDO3IN;
+ } else {
cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
+ cfg = AXP209_LDO3_VOLTAGE_SET(cfg);
+ }
rc = pmic_bus_write(AXP209_LDO3_VOLTAGE, cfg);
if (rc)
if (rc)
return rc;
- /* LDO4 configuration is in lower 4 bits */
- reg = (reg & 0xf0) | (cfg << 0);
+ reg |= AXP209_LDO24_LDO4_SET(reg, cfg);
rc = pmic_bus_write(AXP209_LDO24_VOLTAGE, reg);
if (rc)
return rc;