[PATCH V2 06/15] power: supply: axp20x_usb_power: add input-current-limit-microamp

Chris Morgan
2024-08-02T19:22:55Z

Allow users to specify a maximum input current for the device. Some
devices allow up to 3.25A of input current (such as the AXP717), which
may be too much for some implementations.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
drivers/power/supply/axp20x_usb_power.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c
index cd9e92f2ce71..69fbb5861934 100644
--- a/drivers/power/supply/axp20x_usb_power.c
+++ b/drivers/power/supply/axp20x_usb_power.c
@@ -80,6 +80,7 @@ struct axp20x_usb_power {
struct iio_channel *vbus_v;
struct iio_channel *vbus_i;
struct delayed_work vbus_detect;
+ int max_input_cur;
unsigned int old_status;
unsigned int online;
unsigned int num_irqs;
@@ -323,6 +324,13 @@ static int axp20x_usb_power_set_input_current_limit(struct axp20x_usb_power *pow
if (intval == -1)
return -EINVAL;

+ if (power->max_input_cur && (intval > power->max_input_cur)) {
+ dev_warn(power->dev,
+ "reqested current %d clamped to max current %d\n",
+ intval, power->max_input_cur);
+ intval = power->max_input_cur;
+ }
+
/*
* BC1.2 detection can cause a race condition if we try to set a current
* limit while it's in progress. When it finishes it will overwrite the
@@ -661,6 +669,18 @@ static int axp20x_regmap_field_alloc_optional(struct device *dev,
return 0;
}

+/* Optionally allow users to specify a maximum charging current. */
+static void axp20x_usb_power_parse_dt(struct device *dev,
+ struct axp20x_usb_power *power)
+{
+ int ret;
+
+ ret = device_property_read_u32(dev, "input-current-limit-microamp",
+ &power->max_input_cur);
+ if (ret)
+ dev_dbg(dev, "%s() no input-current-limit specified\n", __func__);
+}
+
static int axp20x_usb_power_probe(struct platform_device *pdev)
{
struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
@@ -697,6 +717,8 @@ static int axp20x_usb_power_probe(struct platform_device *pdev)
if (IS_ERR(power->curr_lim_fld))
return PTR_ERR(power->curr_lim_fld);

+ axp20x_usb_power_parse_dt(&pdev->dev, power);
+
ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap,
axp_data->vbus_valid_bit,
&power->vbus_valid_bit);
--
2.34.1