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regulator: Add a routine to set the current limit for QCOM PMIC VBUS 

Add hooks to regulator_get_current_limit_regmap() and
regulator_set_current_limit_regmap() with an accompanying map of amperages.

This lets us use the existing helper functions to map requested current
settings to register bit-map/indicies.

This change is required to elevate the default 2 Amps set by the bootloader
to 3 Amps or indeed to constrain the value lower as the system design may
dictate.

The valid range is 500 mA to 3 A in increments of 500 mA.

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20210427130712.2005456-2-bryan.odonoghue@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Bryan O'Donoghue 2021-04-27 14:07:11 +01:00 committed by Mark Brown
parent 6efb943b86
commit 67823d9dad
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GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 0 deletions
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12
drivers/regulator/qcom_usb_vbus-regulator.c
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@ -16,13 +16,21 @@
#define CMD_OTG 0x40
#define OTG_EN BIT(0)
#define OTG_CURRENT_LIMIT_CFG 0x52
#define OTG_CURRENT_LIMIT_MASK GENMASK(2, 0)
#define OTG_CFG 0x53
#define OTG_EN_SRC_CFG BIT(1)
static const unsigned int curr_table[] = {
500000, 1000000, 1500000, 2000000, 2500000, 3000000,
};
static const struct regulator_ops qcom_usb_vbus_reg_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_current_limit = regulator_get_current_limit_regmap,
.set_current_limit = regulator_set_current_limit_regmap,
};
static struct regulator_desc qcom_usb_vbus_rdesc = {
@ -30,6 +38,8 @@ static struct regulator_desc qcom_usb_vbus_rdesc = {
.ops = &qcom_usb_vbus_reg_ops,
.owner = THIS_MODULE,
.type = REGULATOR_VOLTAGE,
.curr_table = curr_table,
.n_current_limits = ARRAY_SIZE(curr_table),
};
static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
@ -61,6 +71,8 @@ static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
qcom_usb_vbus_rdesc.csel_reg = base + OTG_CURRENT_LIMIT_CFG;
qcom_usb_vbus_rdesc.csel_mask = OTG_CURRENT_LIMIT_MASK;
config.dev = dev;
config.init_data = init_data;
config.of_node = dev->of_node;