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gpio/mxc: add device tree probe support

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The patch adds device tree probe support for gpio-mxc driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Shawn Guo 2011-07-07 00:37:43 +08:00 committed by Grant Likely
parent 14305e685d
commit 8937cb602b
2 changed files with 50 additions and 6 deletions
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22
Documentation/devicetree/bindings/gpio/fsl-imx-gpio.txt Normal file
View File

@ -0,0 +1,22 @@
* Freescale i.MX/MXC GPIO controller
Required properties:
- compatible : Should be "fsl,<soc>-gpio"
- reg : Address and length of the register set for the device
- interrupts : Should be the port interrupt shared by all 32 pins, if
one number. If two numbers, the first one is the interrupt shared
by low 16 pins and the second one is for high 16 pins.
- gpio-controller : Marks the device node as a gpio controller.
- #gpio-cells : Should be two. The first cell is the pin number and
the second cell is used to specify optional parameters (currently
unused).
Example:
gpio0: gpio@73f84000 {
compatible = "fsl,imx51-gpio", "fsl,imx31-gpio";
reg = <0x73f84000 0x4000>;
interrupts = <50 51>;
gpio-controller;
#gpio-cells = <2>;
};

34
drivers/gpio/gpio-mxc.c
View File

@ -27,6 +27,8 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/basic_mmio_gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm-generic/bug.h>
enum mxc_gpio_hwtype {
@ -120,6 +122,13 @@ static struct platform_device_id mxc_gpio_devtype[] = {
}
};
static const struct of_device_id mxc_gpio_dt_ids[] = {
{ .compatible = "fsl,imx1-gpio", .data = &mxc_gpio_devtype[IMX1_GPIO], },
{ .compatible = "fsl,imx21-gpio", .data = &mxc_gpio_devtype[IMX21_GPIO], },
{ .compatible = "fsl,imx31-gpio", .data = &mxc_gpio_devtype[IMX31_GPIO], },
{ /* sentinel */ }
};
/*
* MX2 has one interrupt *for all* gpio ports. The list is used
* to save the references to all ports, so that mx2_gpio_irq_handler
@ -302,7 +311,13 @@ static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port)
static void __devinit mxc_gpio_get_hw(struct platform_device *pdev)
{
enum mxc_gpio_hwtype hwtype = pdev->id_entry->driver_data;
const struct of_device_id *of_id =
of_match_device(mxc_gpio_dt_ids, &pdev->dev);
enum mxc_gpio_hwtype hwtype;
if (of_id)
pdev->id_entry = of_id->data;
hwtype = pdev->id_entry->driver_data;
if (mxc_gpio_hwtype) {
/*
@ -324,6 +339,7 @@ static void __devinit mxc_gpio_get_hw(struct platform_device *pdev)
static int __devinit mxc_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct mxc_gpio_port *port;
struct resource *iores;
int err;
@ -334,8 +350,6 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
if (!port)
return -ENOMEM;
port->virtual_irq_start = MXC_GPIO_IRQ_START + pdev->id * 32;
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iores) {
err = -ENODEV;
@ -365,9 +379,6 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
writel(0, port->base + GPIO_IMR);
writel(~0, port->base + GPIO_ISR);
/* gpio-mxc can be a generic irq chip */
mxc_gpio_init_gc(port);
if (mxc_gpio_hwtype == IMX21_GPIO) {
/* setup one handler for all GPIO interrupts */
if (pdev->id == 0)
@ -400,6 +411,16 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
if (err)
goto out_bgpio_remove;
/*
* In dt case, we use gpio number range dynamically
* allocated by gpio core.
*/
port->virtual_irq_start = MXC_GPIO_IRQ_START + (np ? port->bgc.gc.base :
pdev->id * 32);
/* gpio-mxc can be a generic irq chip */
mxc_gpio_init_gc(port);
list_add_tail(&port->node, &mxc_gpio_ports);
return 0;
@ -420,6 +441,7 @@ static struct platform_driver mxc_gpio_driver = {
.driver = {
.name = "gpio-mxc",
.owner = THIS_MODULE,
.of_match_table = mxc_gpio_dt_ids,
},
.probe = mxc_gpio_probe,
.id_table = mxc_gpio_devtype,