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Commit 17b4565b authored by Kim, Milo's avatar Kim, Milo Committed by Anton Vorontsov
Browse files

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: default avatarMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent 0f1e0169

Documentation/devicetree/bindings/power_supply/lp8727_charger.txt

0 → 100644
+44 −0
Original line number Diff line number Diff line 
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>;

	};

};

drivers/power/lp8727_charger.c

+68 −0
Original line number Diff line number Diff line
@@ -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,