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i2c: pxa: add OF support

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Append these properties in below.
mrvl,i2c-polling
mrvl,i2c-fast-mode

Still keep slave, slave_addr and class in platform data.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Haojian Zhuang 2012-03-01 13:04:44 +08:00 committed by Haojian Zhuang
parent 699c20f3e6
commit 63fe122bce
1 changed files with 75 additions and 22 deletions
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97
drivers/i2c/busses/i2c-pxa.c
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@ -29,6 +29,8 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/i2c-pxa.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_i2c.h>
#include <linux/platform_device.h>
#include <linux/err.h>
@ -1044,23 +1046,60 @@ static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
.functionality = i2c_pxa_functionality,
};
static struct of_device_id i2c_pxa_dt_ids[] = {
{ .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
{ .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
{ .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA2XX },
{}
};
MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
enum pxa_i2c_types *i2c_types)
{
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *of_id =
of_match_device(i2c_pxa_dt_ids, &pdev->dev);
int ret;
if (!of_id)
return 1;
ret = of_alias_get_id(np, "i2c");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
return ret;
}
pdev->id = ret;
if (of_get_property(np, "mrvl,i2c-polling", NULL))
i2c->use_pio = 1;
if (of_get_property(np, "mrvl,i2c-fast-mode", NULL))
i2c->fast_mode = 1;
*i2c_types = (u32)(of_id->data);
return 0;
}
static int i2c_pxa_probe_pdata(struct platform_device *pdev,
struct pxa_i2c *i2c,
enum pxa_i2c_types *i2c_types)
{
struct i2c_pxa_platform_data *plat = pdev->dev.platform_data;
const struct platform_device_id *id = platform_get_device_id(pdev);
*i2c_types = id->driver_data;
if (plat) {
i2c->use_pio = plat->use_pio;
i2c->fast_mode = plat->fast_mode;
}
return 0;
}
static int i2c_pxa_probe(struct platform_device *dev)
{
struct pxa_i2c *i2c;
struct resource *res;
struct i2c_pxa_platform_data *plat = dev->dev.platform_data;
const struct platform_device_id *id = platform_get_device_id(dev);
enum pxa_i2c_types i2c_type = id->driver_data;
int ret;
int irq;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
irq = platform_get_irq(dev, 0);
if (res == NULL || irq < 0)
return -ENODEV;
if (!request_mem_region(res->start, resource_size(res), res->name))
return -ENOMEM;
enum pxa_i2c_types i2c_type;
struct pxa_i2c *i2c;
struct resource *res = NULL;
int ret, irq;
i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
if (!i2c) {
@ -1068,6 +1107,24 @@ static int i2c_pxa_probe(struct platform_device *dev)
goto emalloc;
}
ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
if (ret > 0)
ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
if (ret < 0)
goto eclk;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
irq = platform_get_irq(dev, 0);
if (res == NULL || irq < 0) {
ret = -ENODEV;
goto eclk;
}
if (!request_mem_region(res->start, resource_size(res), res->name)) {
ret = -ENOMEM;
goto eclk;
}
i2c->adap.owner = THIS_MODULE;
i2c->adap.retries = 5;
@ -1109,21 +1166,16 @@ static int i2c_pxa_probe(struct platform_device *dev)
i2c->slave_addr = I2C_PXA_SLAVE_ADDR;
#ifdef CONFIG_I2C_PXA_SLAVE
if (plat) {
#ifdef CONFIG_I2C_PXA_SLAVE
i2c->slave_addr = plat->slave_addr;
i2c->slave = plat->slave;
}
#endif
i2c->adap.class = plat->class;
}
clk_enable(i2c->clk);
if (plat) {
i2c->adap.class = plat->class;
i2c->use_pio = plat->use_pio;
i2c->fast_mode = plat->fast_mode;
}
if (i2c->use_pio) {
i2c->adap.algo = &i2c_pxa_pio_algorithm;
} else {
@ -1234,6 +1286,7 @@ static struct platform_driver i2c_pxa_driver = {
.name = "pxa2xx-i2c",
.owner = THIS_MODULE,
.pm = I2C_PXA_DEV_PM_OPS,
.of_match_table = i2c_pxa_dt_ids,
},
.id_table = i2c_pxa_id_table,
};