diff options
| -rw-r--r-- | Documentation/devicetree/bindings/power_supply/lp8727_charger.txt | 44 | ||||
| -rw-r--r-- | drivers/power/lp8727_charger.c | 68 |
2 files changed, 112 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/power_supply/lp8727_charger.txt b/Documentation/devicetree/bindings/power_supply/lp8727_charger.txt new file mode 100644 index 00000000000..2246bc5c874 --- /dev/null +++ b/Documentation/devicetree/bindings/power_supply/lp8727_charger.txt @@ -0,0 +1,44 @@ +Binding for TI/National Semiconductor LP8727 Charger + +Required properties: +- compatible: "ti,lp8727" +- reg: I2C slave address 27h + +Optional properties: +- interrupt-parent: interrupt controller node (see interrupt binding[0]) +- interrupts: interrupt specifier (see interrupt binding[0]) +- debounce-ms: interrupt debounce time. (u32) + +AC and USB charging parameters +- charger-type: "ac" or "usb" (string) +- eoc-level: value of 'enum lp8727_eoc_level' (u8) +- charging-current: value of 'enum lp8727_ichg' (u8) + +[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt + +Example) + +lp8727@27 { + compatible = "ti,lp8727"; + reg = <0x27>; + + /* GPIO 134 is used for LP8728 interrupt pin */ + interrupt-parent = <&gpio5>; /* base = 128 */ + interrupts = <6 0x2>; /* offset = 6, falling edge type */ + + debounce-ms = <300>; + + /* AC charger: 5% EOC and 500mA charging current */ + ac { + charger-type = "ac"; + eoc-level = /bits/ 8 <0>; + charging-current = /bits/ 8 <4>; + }; + + /* USB charger: 10% EOC and 400mA charging current */ + usb { + charger-type = "usb"; + eoc-level = /bits/ 8 <1>; + charging-current = /bits/ 8 <2>; + }; +}; diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c index 5ef41b81917..32de636dcd7 100644 --- a/drivers/power/lp8727_charger.c +++ b/drivers/power/lp8727_charger.c @@ -16,6 +16,7 @@ #include <linux/i2c.h> #include <linux/power_supply.h> #include <linux/platform_data/lp8727.h> +#include <linux/of.h> #define LP8788_NUM_INTREGS 2 #define DEFAULT_DEBOUNCE_MSEC 270 @@ -481,6 +482,60 @@ static void lp8727_unregister_psy(struct lp8727_chg *pchg) power_supply_unregister(&psy->batt); } +#ifdef CONFIG_OF +static struct lp8727_chg_param +*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np) +{ + struct lp8727_chg_param *param; + + param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL); + if (!param) + goto out; + + of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level); + of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg); +out: + return param; +} + +static int lp8727_parse_dt(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct device_node *child; + struct lp8727_platform_data *pdata; + const char *type; + + /* If charging parameter is not defined, just skip parsing the dt */ + if (of_get_child_count(np) == 0) + goto out; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec); + + for_each_child_of_node(np, child) { + of_property_read_string(child, "charger-type", &type); + + if (!strcmp(type, "ac")) + pdata->ac = lp8727_parse_charge_pdata(dev, child); + + if (!strcmp(type, "usb")) + pdata->usb = lp8727_parse_charge_pdata(dev, child); + } + + dev->platform_data = pdata; +out: + return 0; +} +#else +static int lp8727_parse_dt(struct device *dev) +{ + return 0; +} +#endif + static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id) { struct lp8727_chg *pchg; @@ -489,6 +544,12 @@ static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id) if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) return -EIO; + if (cl->dev.of_node) { + ret = lp8727_parse_dt(&cl->dev); + if (ret) + return ret; + } + pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL); if (!pchg) return -ENOMEM; @@ -531,6 +592,12 @@ static int lp8727_remove(struct i2c_client *cl) return 0; } +static const struct of_device_id lp8727_dt_ids[] = { + { .compatible = "ti,lp8727", }, + { } +}; +MODULE_DEVICE_TABLE(of, lp8727_dt_ids); + static const struct i2c_device_id lp8727_ids[] = { {"lp8727", 0}, { } @@ -540,6 +607,7 @@ MODULE_DEVICE_TABLE(i2c, lp8727_ids); static struct i2c_driver lp8727_driver = { .driver = { .name = "lp8727", + .of_match_table = of_match_ptr(lp8727_dt_ids), }, .probe = lp8727_probe, .remove = lp8727_remove, |