leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

lp8727_charger: Support the device tree feature

Browse Source 
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>
This commit is contained in:
Kim, Milo 2013-05-10 07:17:51 +00:00 committed by Anton Vorontsov
parent 0f1e0169e0
commit 17b4565b30
2 changed files with 112 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
Documentation/devicetree/bindings/power_supply/lp8727_charger.txt Normal file
View File

@ -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>;
};
};

68
drivers/power/lp8727_charger.c
View File

@ -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,