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authorKim, Milo <Milo.Kim@ti.com>2013-05-10 07:17:51 +0000
committerAnton Vorontsov <anton@enomsg.org>2013-06-06 17:19:54 -0700
commit17b4565b308ed31fa20b59842c75e685a101dc8a (patch)
tree6f6462adc90736ce91d57bffc5c6b73865bda56e
parent0f1e0169e08e1645a8406ab84286ebaf19c5cce5 (diff)
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lp8727_charger: Support the device tree feature
The interrupt and charging parameters are configurable in the device tree structure. In the board test, a GPIO is used for handling LP8727 interrupts. The device tree binding documentation is added also. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Anton Vorontsov <anton@enomsg.org>
-rw-r--r--Documentation/devicetree/bindings/power_supply/lp8727_charger.txt44
-rw-r--r--drivers/power/lp8727_charger.c68
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 000000000000..2246bc5c874b
--- /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 5ef41b819172..32de636dcd73 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 *)&param->eoc_level);
+ of_property_read_u8(np, "charging-current", (u8 *)&param->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,