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path: root/drivers/regulator/anatop-regulator.c
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Diffstat (limited to 'drivers/regulator/anatop-regulator.c')
-rw-r--r--drivers/regulator/anatop-regulator.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
index 8f39cac661d2..0d4a8ccbb536 100644
--- a/drivers/regulator/anatop-regulator.c
+++ b/drivers/regulator/anatop-regulator.c
@@ -31,12 +31,18 @@
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
+#define LDO_RAMP_UP_UNIT_IN_CYCLES 64 /* 64 cycles per step */
+#define LDO_RAMP_UP_FREQ_IN_MHZ 24 /* cycle based on 24M OSC */
+
struct anatop_regulator {
const char *name;
u32 control_reg;
struct regmap *anatop;
int vol_bit_shift;
int vol_bit_width;
+ u32 delay_reg;
+ int delay_bit_shift;
+ int delay_bit_width;
int min_bit_val;
int min_voltage;
int max_voltage;
@@ -55,6 +61,32 @@ static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
return regulator_set_voltage_sel_regmap(reg, selector);
}
+static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg,
+ unsigned int old_sel,
+ unsigned int new_sel)
+{
+ struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+ u32 val;
+ int ret = 0;
+
+ /* check whether need to care about LDO ramp up speed */
+ if (anatop_reg->delay_bit_width && new_sel > old_sel) {
+ /*
+ * the delay for LDO ramp up time is
+ * based on the register setting, we need
+ * to calculate how many steps LDO need to
+ * ramp up, and how much delay needed. (us)
+ */
+ regmap_read(anatop_reg->anatop, anatop_reg->delay_reg, &val);
+ val = (val >> anatop_reg->delay_bit_shift) &
+ ((1 << anatop_reg->delay_bit_width) - 1);
+ ret = (new_sel - old_sel) * (LDO_RAMP_UP_UNIT_IN_CYCLES <<
+ val) / LDO_RAMP_UP_FREQ_IN_MHZ + 1;
+ }
+
+ return ret;
+}
+
static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
@@ -67,6 +99,7 @@ static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
static struct regulator_ops anatop_rops = {
.set_voltage_sel = anatop_regmap_set_voltage_sel,
+ .set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
.get_voltage_sel = anatop_regmap_get_voltage_sel,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
@@ -143,6 +176,14 @@ static int anatop_regulator_probe(struct platform_device *pdev)
goto anatop_probe_end;
}
+ /* read LDO ramp up setting, only for core reg */
+ of_property_read_u32(np, "anatop-delay-reg-offset",
+ &sreg->delay_reg);
+ of_property_read_u32(np, "anatop-delay-bit-width",
+ &sreg->delay_bit_width);
+ of_property_read_u32(np, "anatop-delay-bit-shift",
+ &sreg->delay_bit_shift);
+
rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
+ sreg->min_bit_val;
rdesc->min_uV = sreg->min_voltage;