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authorAndrew Bresticker <abrestic@chromium.org>2013-12-26 13:48:46 -0800
committerMark Brown <broonie@linaro.org>2014-01-06 18:09:36 +0000
commit762a8ee808972354ce4bca988309aa7fb63ed5ae (patch)
tree19fed2a02e18080a06aef61eae22131e3c494f1f /drivers/regulator
parentbc2571f4ba375101c9d0b7d46d8c241822652433 (diff)
regulator: as3722: detect SD0 low-voltage mode
SD0 may operate in low-voltage mode, with a minimum of 0.41V and a maximum of 1.5V. This is indicated by bit 4 of FUSE7. Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Signed-off-by: Vince Hsu <vinceh@nvidia.com> broonie.e6264@m.evernote.com Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/as3722-regulator.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/regulator/as3722-regulator.c b/drivers/regulator/as3722-regulator.c
index fdb31371a232..3d7fbc21181d 100644
--- a/drivers/regulator/as3722-regulator.c
+++ b/drivers/regulator/as3722-regulator.c
@@ -99,7 +99,6 @@ static const struct as3722_register_mapping as3722_reg_lookup[] = {
.sleep_ctrl_mask = AS3722_SD0_EXT_ENABLE_MASK,
.control_reg = AS3722_SD0_CONTROL_REG,
.mode_mask = AS3722_SD0_MODE_FAST,
- .n_voltages = AS3722_SD0_VSEL_MAX + 1,
},
{
.regulator_id = AS3722_REGULATOR_ID_SD1,
@@ -112,7 +111,6 @@ static const struct as3722_register_mapping as3722_reg_lookup[] = {
.sleep_ctrl_mask = AS3722_SD1_EXT_ENABLE_MASK,
.control_reg = AS3722_SD1_CONTROL_REG,
.mode_mask = AS3722_SD1_MODE_FAST,
- .n_voltages = AS3722_SD0_VSEL_MAX + 1,
},
{
.regulator_id = AS3722_REGULATOR_ID_SD2,
@@ -181,7 +179,6 @@ static const struct as3722_register_mapping as3722_reg_lookup[] = {
.sleep_ctrl_mask = AS3722_SD6_EXT_ENABLE_MASK,
.control_reg = AS3722_SD6_CONTROL_REG,
.mode_mask = AS3722_SD6_MODE_FAST,
- .n_voltages = AS3722_SD0_VSEL_MAX + 1,
},
{
.regulator_id = AS3722_REGULATOR_ID_LDO0,
@@ -595,6 +592,22 @@ static int as3722_sd016_set_current_limit(struct regulator_dev *rdev,
return as3722_update_bits(as3722, reg, mask, val);
}
+static bool as3722_sd0_is_low_voltage(struct as3722_regulators *as3722_regs)
+{
+ int err;
+ unsigned val;
+
+ err = as3722_read(as3722_regs->as3722, AS3722_FUSE7_REG, &val);
+ if (err < 0) {
+ dev_err(as3722_regs->dev, "Reg 0x%02x read failed: %d\n",
+ AS3722_FUSE7_REG, err);
+ return false;
+ }
+ if (val & AS3722_FUSE7_SD0_LOW_VOLTAGE)
+ return true;
+ return false;
+}
+
static const struct regulator_linear_range as3722_sd2345_ranges[] = {
REGULATOR_LINEAR_RANGE(612500, 0x01, 0x40, 12500),
REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
@@ -820,7 +833,16 @@ static int as3722_regulator_probe(struct platform_device *pdev)
ops = &as3722_sd016_extcntrl_ops;
else
ops = &as3722_sd016_ops;
- as3722_regs->desc[id].min_uV = 610000;
+ if (id == AS3722_REGULATOR_ID_SD0 &&
+ as3722_sd0_is_low_voltage(as3722_regs)) {
+ as3722_regs->desc[id].n_voltages =
+ AS3722_SD0_VSEL_LOW_VOL_MAX + 1;
+ as3722_regs->desc[id].min_uV = 410000;
+ } else {
+ as3722_regs->desc[id].n_voltages =
+ AS3722_SD0_VSEL_MAX + 1,
+ as3722_regs->desc[id].min_uV = 610000;
+ }
as3722_regs->desc[id].uV_step = 10000;
as3722_regs->desc[id].linear_min_sel = 1;
break;