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Commit 70d46a24 authored by Ludovic Desroches's avatar Ludovic Desroches Committed by Wolfram Sang
Browse files

i2c: at91: add dt support to i2c-at91 



Signed-off-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: default avatarNikolaus Voss <n.voss@weinmann.de>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
parent 94e73465

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

0 → 100644
+30 −0
Original line number Diff line number Diff line 
I2C for Atmel platforms



Required properties :

- compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",

     "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c"

     or "atmel,at91sam9x5-i2c"

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

     region.

- interrupts: interrupt number to the cpu.

- #address-cells = <1>;

- #size-cells = <0>;



Optional properties:

- Child nodes conforming to i2c bus binding



Examples :



i2c0: i2c@fff84000 {

	compatible = "atmel,at91sam9g20-i2c";

	reg = <0xfff84000 0x100>;

	interrupts = <12 4 6>;

	#address-cells = <1>;

	#size-cells = <0>;



	24c512@50 {

		compatible = "24c512";

		reg = <0x50>;

		pagesize = <128>;

	}

}

drivers/i2c/busses/i2c-at91.c

+49 −0
Original line number Diff line number Diff line
@@ -24,6 +24,9 @@ 
#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/of_i2c.h>

#include <linux/platform_device.h>

#include <linux/slab.h>
@@ -347,6 +350,12 @@ static struct at91_twi_pdata at91sam9g10_config = { 
	.has_unre_flag = false,

};



static struct at91_twi_pdata at91sam9x5_config = {

	.clk_max_div = 7,

	.clk_offset = 4,

	.has_unre_flag = false,

};



static const struct platform_device_id at91_twi_devtypes[] = {

	{

		.name = "i2c-at91rm9200",
@@ -368,6 +377,42 @@ static const struct platform_device_id at91_twi_devtypes[] = { 
	}

};



#if defined(CONFIG_OF)

static const struct of_device_id atmel_twi_dt_ids[] = {

	{

		.compatible = "atmel,at91sam9260-i2c",

		.data = &at91sam9260_config,

	} , {

		.compatible = "atmel,at91sam9g20-i2c",

		.data = &at91sam9g20_config,

	} , {

		.compatible = "atmel,at91sam9g10-i2c",

		.data = &at91sam9g10_config,

	}, {

		.compatible = "atmel,at91sam9x5-i2c",

		.data = &at91sam9x5_config,

	}, {

		/* sentinel */

	}

};

MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);

#else

#define atmel_twi_dt_ids NULL

#endif



static struct at91_twi_pdata * __devinit at91_twi_get_driver_data(

					struct platform_device *pdev)

{

	if (pdev->dev.of_node) {

		const struct of_device_id *match;

		match = of_match_node(atmel_twi_dt_ids, pdev->dev.of_node);

		if (!match)

			return NULL;

		return match->data;

	}

	return (struct at91_twi_pdata *) platform_get_device_id(pdev)->driver_data;

}



static int __devinit at91_twi_probe(struct platform_device *pdev)

{

	struct at91_twi_dev *dev;
@@ -423,6 +468,7 @@ static int __devinit at91_twi_probe(struct platform_device *pdev) 
	dev->adapter.dev.parent = dev->dev;

	dev->adapter.nr = pdev->id;

	dev->adapter.timeout = AT91_I2C_TIMEOUT;

	dev->adapter.dev.of_node = pdev->dev.of_node;



	rc = i2c_add_numbered_adapter(&dev->adapter);

	if (rc) {
@@ -432,6 +478,8 @@ static int __devinit at91_twi_probe(struct platform_device *pdev) 
		return rc;

	}



	of_i2c_register_devices(&dev->adapter);



	dev_info(dev->dev, "AT91 i2c bus driver.\n");

	return 0;

}
@@ -482,6 +530,7 @@ static struct platform_driver at91_twi_driver = { 
	.driver		= {

		.name	= "at91_i2c",

		.owner	= THIS_MODULE,

		.of_match_table = atmel_twi_dt_ids,

		.pm	= at91_twi_pm_ops,

	},

};