Commit 4052d45e authored by Shawn Guo's avatar Shawn Guo
Browse files

gpio/mxs: add device tree probe 



It adds device tree probe for gpio-mxs driver.

Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 164387d2

Documentation/devicetree/bindings/gpio/gpio-mxs.txt

0 → 100644
+87 −0
Original line number Diff line number Diff line 
* Freescale MXS GPIO controller



The Freescale MXS GPIO controller is part of MXS PIN controller.  The

GPIOs are organized in port/bank.  Each port consists of 32 GPIOs.



As the GPIO controller is embedded in the PIN controller and all the

GPIO ports share the same IO space with PIN controller, the GPIO node

will be represented as sub-nodes of MXS pinctrl node.



Required properties for GPIO node:

- compatible : Should be "fsl,<soc>-gpio".  The supported SoCs include

  imx23 and imx28.

- interrupts : Should be the port interrupt shared by all 32 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).

- interrupt-controller: Marks the device node as an interrupt controller.

- #interrupt-cells : Should be 2.  The first cell is the GPIO number.

  The second cell bits[3:0] is used to specify trigger type and level flags:

      1 = low-to-high edge triggered.

      2 = high-to-low edge triggered.

      4 = active high level-sensitive.

      8 = active low level-sensitive.



Note: Each GPIO port should have an alias correctly numbered in "aliases"

node.



Examples:



aliases {

	gpio0 = &gpio0;

	gpio1 = &gpio1;

	gpio2 = &gpio2;

	gpio3 = &gpio3;

	gpio4 = &gpio4;

};



pinctrl@80018000 {

	compatible = "fsl,imx28-pinctrl", "simple-bus";

	reg = <0x80018000 2000>;



	gpio0: gpio@0 {

		compatible = "fsl,imx28-gpio";

		interrupts = <127>;

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

	};



	gpio1: gpio@1 {

		compatible = "fsl,imx28-gpio";

		interrupts = <126>;

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

	};



	gpio2: gpio@2 {

		compatible = "fsl,imx28-gpio";

		interrupts = <125>;

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

	};



	gpio3: gpio@3 {

		compatible = "fsl,imx28-gpio";

		interrupts = <124>;

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

	};



	gpio4: gpio@4 {

		compatible = "fsl,imx28-gpio";

		interrupts = <123>;

		gpio-controller;

		#gpio-cells = <2>;

		interrupt-controller;

		#interrupt-cells = <2>;

	};

};

drivers/gpio/gpio-mxs.c

+32 −4
Original line number Diff line number Diff line
@@ -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;



	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) {

		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,