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gpio/mxs: add device tree probe

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It adds device tree probe for gpio-mxs driver.

Signed-off-by: Shawn Guo <[email protected]>
Acked-by: Linus Walleij <[email protected]>
This commit is contained in:
Shawn Guo 2012-05-04 14:29:22 +08:00
commit 4052d45e80
2 changed files with 119 additions and 4 deletions
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36
drivers/gpio/gpio-mxs.c
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@ -25,6 +25,9 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/basic_mmio_gpio.h>
@ -207,8 +210,19 @@ static struct platform_device_id mxs_gpio_ids[] = {
};
MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
static const struct of_device_id mxs_gpio_dt_ids[] = {
{ .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
{ .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
static int __devinit mxs_gpio_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(mxs_gpio_dt_ids, &pdev->dev);
struct device_node *np = pdev->dev.of_node;
struct device_node *parent;
static void __iomem *base;
struct mxs_gpio_port *port;
struct resource *iores = NULL;
@ -218,8 +232,15 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
if (!port)
return -ENOMEM;
port->id = pdev->id;
port->devid = pdev->id_entry->driver_data;
if (np) {
port->id = of_alias_get_id(np, "gpio");
if (port->id < 0)
return port->id;
port->devid = (enum mxs_gpio_id) of_id->data;
} else {
port->id = pdev->id;
port->devid = pdev->id_entry->driver_data;
}
port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
port->irq = platform_get_irq(pdev, 0);
@ -231,8 +252,14 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
* share the same one
*/
if (!base) {
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_request_and_ioremap(&pdev->dev, iores);
if (np) {
parent = of_get_parent(np);
base = of_iomap(parent, 0);
of_node_put(parent);
} else {
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_request_and_ioremap(&pdev->dev, iores);
}
if (!base)
return -EADDRNOTAVAIL;
}
@ -278,6 +305,7 @@ static struct platform_driver mxs_gpio_driver = {
.driver = {
.name = "gpio-mxs",
.owner = THIS_MODULE,
.of_match_table = mxs_gpio_dt_ids,
},
.probe = mxs_gpio_probe,
.id_table = mxs_gpio_ids,