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i2c: at91: add dt support to i2c-at91

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Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Nikolaus Voss <n.voss@weinmann.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Ludovic Desroches 2012-09-12 08:42:14 +02:00 • committed by Wolfram Sang
commit 70d46a241e
2 changed files with 79 additions and 0 deletions
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30
Documentation/devicetree/bindings/i2c/atmel-i2c.txt Normal file
View file

@ -0,0 +1,30 @@
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>;
}
}

49
drivers/i2c/busses/i2c-at91.c
View file

@ -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,
},
};