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Commit 0e8ce93b authored by Chris Packham's avatar Chris Packham Committed by Wolfram Sang
Browse files

i2c: pca-platform: add devicetree awareness 



Allow devices that use this driver to be registered via a
devicetree.

Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
[wsa: fixed leakage when registering GPIO failed]
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 4cc7229d

drivers/i2c/busses/i2c-pca-platform.c

+25 −0
Original line number Diff line number Diff line
@@ -24,6 +24,8 @@ 
#include <linux/gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_device.h>



#include <asm/irq.h>
@@ -137,12 +139,15 @@ static int i2c_pca_pf_probe(struct platform_device *pdev) 
	struct resource *res;

	struct i2c_pca9564_pf_platform_data *platform_data =

				dev_get_platdata(&pdev->dev);

	struct device_node *np = pdev->dev.of_node;

	int ret = 0;

	int irq;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	irq = platform_get_irq(pdev, 0);

	/* If irq is 0, we do polling. */

	if (irq < 0)

		irq = 0;



	if (res == NULL) {

		ret = -ENODEV;
@@ -178,6 +183,7 @@ static int i2c_pca_pf_probe(struct platform_device *pdev) 
		 (unsigned long) res->start);

	i2c->adap.algo_data = &i2c->algo_data;

	i2c->adap.dev.parent = &pdev->dev;

	i2c->adap.dev.of_node = np;



	if (platform_data) {

		i2c->adap.timeout = platform_data->timeout;
@@ -196,6 +202,15 @@ static int i2c_pca_pf_probe(struct platform_device *pdev) 
				i2c->gpio = NULL;

			}

		}

	} else if (np) {

		i2c->adap.timeout = HZ;

		i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset-gpios", GPIOD_OUT_LOW);

		if (IS_ERR(i2c->gpio)) {

			ret = PTR_ERR(i2c->gpio);

			goto e_reqirq;

		}

		of_property_read_u32_index(np, "clock-frequency", 0,

					   &i2c->algo_data.i2c_clock);

	} else {

		i2c->adap.timeout = HZ;

		i2c->algo_data.i2c_clock = 59000;
@@ -270,11 +285,21 @@ static int i2c_pca_pf_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_OF

static const struct of_device_id i2c_pca_of_match_table[] = {

	{ .compatible = "nxp,pca9564" },

	{ .compatible = "nxp,pca9665" },

	{},

};

MODULE_DEVICE_TABLE(of, i2c_pca_of_match_table);

#endif



static struct platform_driver i2c_pca_pf_driver = {

	.probe = i2c_pca_pf_probe,

	.remove = i2c_pca_pf_remove,

	.driver = {

		.name = "i2c-pca-platform",

		.of_match_table = of_match_ptr(i2c_pca_of_match_table),

	},

};