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Commit 7679c0e1 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Wolfram Sang
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i2c: rcar: add Device Tree support 



This patch adds Device Tree support to the i2c-rcar driver and respective
documentation.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 8d049403

Documentation/devicetree/bindings/i2c/i2c-rcar.txt

0 → 100644
+23 −0
Original line number Diff line number Diff line 
I2C for R-Car platforms



Required properties:

- compatible: Must be one of

	"renesas,i2c-rcar"

	"renesas,i2c-r8a7778"

	"renesas,i2c-r8a7779"

	"renesas,i2c-r8a7790"

- reg: physical base address of the controller and length of memory mapped

  region.

- interrupts: interrupt specifier.



Optional properties:

- clock-frequency: desired I2C bus clock frequency in Hz. The absence of this

  propoerty indicates the default frequency 100 kHz.



Examples :



i2c0: i2c@e6500000 {

	compatible = "renesas,i2c-rcar-h2";

	reg = <0 0xe6500000 0 0x428>;

	interrupts = <0 174 0x4>;

};

drivers/i2c/busses/i2c-rcar.c

+19 −2
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <linux/i2c/i2c-rcar.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/slab.h>
@@ -638,6 +639,15 @@ static const struct i2c_algorithm rcar_i2c_algo = { 
	.functionality	= rcar_i2c_func,

};



static const struct of_device_id rcar_i2c_dt_ids[] = {

	{ .compatible = "renesas,i2c-rcar", .data = (void *)I2C_RCAR_H1 },

	{ .compatible = "renesas,i2c-r8a7778", .data = (void *)I2C_RCAR_H1 },

	{ .compatible = "renesas,i2c-r8a7779", .data = (void *)I2C_RCAR_H1 },

	{ .compatible = "renesas,i2c-r8a7790", .data = (void *)I2C_RCAR_H2 },

	{},

};

MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids);



static int rcar_i2c_probe(struct platform_device *pdev)

{

	struct i2c_rcar_platform_data *pdata = dev_get_platdata(&pdev->dev);
@@ -655,9 +665,14 @@ static int rcar_i2c_probe(struct platform_device *pdev) 
	}



	bus_speed = 100000; /* default 100 kHz */

	if (pdata && pdata->bus_speed)

	ret = of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed);

	if (ret < 0 && pdata && pdata->bus_speed)

		bus_speed = pdata->bus_speed;



	if (pdev->dev.of_node)

		priv->devtype = (long)of_match_device(rcar_i2c_dt_ids,

						      dev)->data;

	else

		priv->devtype = platform_get_device_id(pdev)->driver_data;



	ret = rcar_i2c_clock_calculate(priv, bus_speed, dev);
@@ -679,6 +694,7 @@ static int rcar_i2c_probe(struct platform_device *pdev) 
	adap->class		= I2C_CLASS_HWMON | I2C_CLASS_SPD;

	adap->retries		= 3;

	adap->dev.parent	= dev;

	adap->dev.of_node	= dev->of_node;

	i2c_set_adapdata(adap, priv);

	strlcpy(adap->name, pdev->name, sizeof(adap->name));
@@ -726,6 +742,7 @@ static struct platform_driver rcar_i2c_driver = { 
	.driver	= {

		.name	= "i2c-rcar",

		.owner	= THIS_MODULE,

		.of_match_table = rcar_i2c_dt_ids,

	},

	.probe		= rcar_i2c_probe,

	.remove		= rcar_i2c_remove,