Commit 6c75ea1e authored by Rhyland Klein's avatar Rhyland Klein Committed by Anton Vorontsov
Browse files

bq20z75: Devicetree init support 



Adding support to generate platform data when kernel is configured
through device tree.

Also adding the binding for the TI bq20z75 fuel gadge and the
bq20z75 driver.

Signed-off-by: default avatarRhyland Klein <rklein@nvidia.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 85b5fbf7

Documentation/devicetree/bindings/power_supply/ti_bq20z75.txt

0 → 100644
+23 −0
Original line number Diff line number Diff line 
TI bq20z75

~~~~~~~~~~



Required properties :

 - compatible : "ti,bq20z75"



Optional properties :

 - ti,i2c-retry-count : The number of times to retry i2c transactions on i2c

   IO failure.

 - ti,poll-retry-count : The number of times to try looking for new status

   after an external change notification.

 - ti,battery-detect-gpios : The gpio which signals battery detection and

   a flag specifying its polarity.



Example:



	bq20z75@b {

		compatible = "ti,bq20z75";

		reg = < 0xb >;

		ti,i2c-retry-count = <2>;

		ti,poll-retry-count = <10>;

		ti,battery-detect-gpios = <&gpio-controller 122 1>;

	}

drivers/power/bq20z75.c

+77 −0
Original line number Diff line number Diff line
@@ -613,6 +613,80 @@ static void bq20z75_delayed_work(struct work_struct *work) 
	}

}



#if defined(CONFIG_OF)



#include <linux/of_device.h>

#include <linux/of_gpio.h>



static const struct of_device_id bq20z75_dt_ids[] = {

	{ .compatible = "ti,bq20z75" },

	{ }

};

MODULE_DEVICE_TABLE(i2c, bq20z75_dt_ids);



static struct bq20z75_platform_data *bq20z75_of_populate_pdata(

		struct i2c_client *client)

{

	struct device_node *of_node = client->dev.of_node;

	struct bq20z75_platform_data *pdata = client->dev.platform_data;

	enum of_gpio_flags gpio_flags;

	int rc;

	u32 prop;



	/* verify this driver matches this device */

	if (!of_node)

		return NULL;



	/* if platform data is set, honor it */

	if (pdata)

		return pdata;



	/* first make sure at least one property is set, otherwise

	 * it won't change behavior from running without pdata.

	 */

	if (!of_get_property(of_node, "ti,i2c-retry-count", NULL) &&

		!of_get_property(of_node, "ti,poll-retry-count", NULL) &&

		!of_get_property(of_node, "ti,battery-detect-gpios", NULL))

		goto of_out;



	pdata = devm_kzalloc(&client->dev, sizeof(struct bq20z75_platform_data),

				GFP_KERNEL);

	if (!pdata)

		goto of_out;



	rc = of_property_read_u32(of_node, "ti,i2c-retry-count", &prop);

	if (!rc)

		pdata->i2c_retry_count = prop;



	rc = of_property_read_u32(of_node, "ti,poll-retry-count", &prop);

	if (!rc)

		pdata->poll_retry_count = prop;



	if (!of_get_property(of_node, "ti,battery-detect-gpios", NULL)) {

		pdata->battery_detect = -1;

		goto of_out;

	}



	pdata->battery_detect = of_get_named_gpio_flags(of_node,

			"ti,battery-detect-gpios", 0, &gpio_flags);



	if (gpio_flags & OF_GPIO_ACTIVE_LOW)

		pdata->battery_detect_present = 0;

	else

		pdata->battery_detect_present = 1;



of_out:

	return pdata;

}

#else

#define bq20z75_dt_ids NULL

static struct bq20z75_platform_data *bq20z75_of_populate_pdata(

	struct i2c_client *client)

{

	return client->dev.platform_data;

}

#endif



static int __devinit bq20z75_probe(struct i2c_client *client,

	const struct i2c_device_id *id)

{
@@ -642,6 +716,8 @@ static int __devinit bq20z75_probe(struct i2c_client *client, 
	bq20z75_device->power_supply.external_power_changed =

		bq20z75_external_power_changed;



	pdata = bq20z75_of_populate_pdata(client);



	if (pdata) {

		bq20z75_device->gpio_detect =

			gpio_is_valid(pdata->battery_detect);
@@ -775,6 +851,7 @@ static struct i2c_driver bq20z75_battery_driver = { 
	.id_table	= bq20z75_id,

	.driver = {

		.name	= "bq20z75-battery",

		.of_match_table = bq20z75_dt_ids,

	},

};