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Commit fa5683e2 authored by Houston Hoffman's avatar Houston Hoffman Committed by Gerrit - the friendly Code Review server
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NFC: add support for pwrreq input device tree entry 



If configured, the pwrreq gpio will act as an input and vote for
power to be supplied to the uicc.

Change-Id: I084d14381da5816188a4313d9ff4df965f0c5a0e
Signed-off-by: default avatarHouston Hoffman <hhoffman@codeaurora.org>
parent 48a4fa1b

Documentation/devicetree/bindings/nfc/nfc-nci.txt

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ Required properties: 


Optional properties:



- qcom,pwr-req-gpio: pmic gpio to vote for power to be supplied to the uicc

- qcom,clk-src-gpio: msm gpio clock,used ony if clock source is msm gpio

- qcom,clk-req-gpio: clk-req input gpio for MSM based clocks.

                     not used for pmic implementation

drivers/nfc/nfc-nci.c

+28 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct qca199x_platform_data { 
	unsigned int	clk_req_irq_num;

	unsigned int dis_gpio;

	unsigned int clkreq_gpio;

	unsigned int pwrreq_gpio;

	unsigned int reg;

	const char *clk_src_name;

	unsigned int clk_src_gpio;
@@ -1207,6 +1208,8 @@ static int nfc_parse_dt(struct device *dev, struct qca199x_platform_data *pdata) 


	r = of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name);



	pdata->pwrreq_gpio = of_get_named_gpio(np, "qcom,pwr-req-gpio", 0);



	if (strcmp(pdata->clk_src_name, "GPCLK2")) {

		pdata->clkreq_gpio = of_get_named_gpio(np, "qcom,clk-gpio", 0);

	}
@@ -1228,6 +1231,22 @@ static int nfc_parse_dt(struct device *dev, struct qca199x_platform_data *pdata) 
	return r;

}



static inline int gpio_input_init(const struct device * const dev,

			const int gpio, const char * const gpio_name)

{

	int r = gpio_request(gpio, gpio_name);

	if (r) {

		dev_err(dev, "unable to request gpio [%d]\n", gpio);

		return r;

	}



	r = gpio_direction_input(gpio);

	if (r)

		dev_err(dev, "unable to set direction for gpio [%d]\n", gpio);



	return r;

}



static int qca199x_probe(struct i2c_client *client,

			const struct i2c_device_id *id)

{
@@ -1416,6 +1435,15 @@ static int qca199x_probe(struct i2c_client *client, 
			goto err_irq_clk;

	}



	if (gpio_is_valid(platform_data->pwrreq_gpio)) {

		r = gpio_input_init(&client->dev, platform_data->pwrreq_gpio,

			"pwrreq_gpio");

		if (r)

			gpio_free(platform_data->pwrreq_gpio);

	} else {

		dev_dbg(&client->dev, "pwrreq gpio not provided");

	}



	if (strcmp(platform_data->clk_src_name, "GPCLK2")) {

		if (gpio_is_valid(platform_data->clkreq_gpio)) {

			r = gpio_request(platform_data->clkreq_gpio,