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gpio/mxs: add device tree probe
It adds device tree probe for gpio-mxs driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Shawn Guo
parent
164387d2b4
commit
4052d45e80
87
Documentation/devicetree/bindings/gpio/gpio-mxs.txt
Normal file
87
Documentation/devicetree/bindings/gpio/gpio-mxs.txt
Normal file
@ -0,0 +1,87 @@
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* Freescale MXS GPIO controller
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The Freescale MXS GPIO controller is part of MXS PIN controller. The
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GPIOs are organized in port/bank. Each port consists of 32 GPIOs.
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As the GPIO controller is embedded in the PIN controller and all the
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GPIO ports share the same IO space with PIN controller, the GPIO node
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will be represented as sub-nodes of MXS pinctrl node.
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Required properties for GPIO node:
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- compatible : Should be "fsl,<soc>-gpio". The supported SoCs include
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imx23 and imx28.
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- interrupts : Should be the port interrupt shared by all 32 pins.
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- gpio-controller : Marks the device node as a gpio controller.
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- #gpio-cells : Should be two. The first cell is the pin number and
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the second cell is used to specify optional parameters (currently
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unused).
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- interrupt-controller: Marks the device node as an interrupt controller.
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- #interrupt-cells : Should be 2. The first cell is the GPIO number.
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The second cell bits[3:0] is used to specify trigger type and level flags:
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1 = low-to-high edge triggered.
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2 = high-to-low edge triggered.
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4 = active high level-sensitive.
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8 = active low level-sensitive.
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Note: Each GPIO port should have an alias correctly numbered in "aliases"
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node.
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Examples:
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aliases {
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gpio0 = &gpio0;
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gpio1 = &gpio1;
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gpio2 = &gpio2;
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gpio3 = &gpio3;
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gpio4 = &gpio4;
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};
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pinctrl@80018000 {
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compatible = "fsl,imx28-pinctrl", "simple-bus";
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reg = <0x80018000 2000>;
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gpio0: gpio@0 {
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compatible = "fsl,imx28-gpio";
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interrupts = <127>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio1: gpio@1 {
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compatible = "fsl,imx28-gpio";
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interrupts = <126>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio2: gpio@2 {
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compatible = "fsl,imx28-gpio";
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interrupts = <125>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio3: gpio@3 {
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compatible = "fsl,imx28-gpio";
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interrupts = <124>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio4: gpio@4 {
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compatible = "fsl,imx28-gpio";
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interrupts = <123>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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};
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@ -25,6 +25,9 @@
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/basic_mmio_gpio.h>
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@ -207,8 +210,19 @@ static struct platform_device_id mxs_gpio_ids[] = {
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};
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MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
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static const struct of_device_id mxs_gpio_dt_ids[] = {
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{ .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
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{ .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
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static int __devinit mxs_gpio_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id =
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of_match_device(mxs_gpio_dt_ids, &pdev->dev);
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struct device_node *np = pdev->dev.of_node;
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struct device_node *parent;
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static void __iomem *base;
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struct mxs_gpio_port *port;
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struct resource *iores = NULL;
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@ -218,8 +232,15 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
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if (!port)
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return -ENOMEM;
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port->id = pdev->id;
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port->devid = pdev->id_entry->driver_data;
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if (np) {
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port->id = of_alias_get_id(np, "gpio");
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if (port->id < 0)
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return port->id;
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port->devid = (enum mxs_gpio_id) of_id->data;
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} else {
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port->id = pdev->id;
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port->devid = pdev->id_entry->driver_data;
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}
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port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
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port->irq = platform_get_irq(pdev, 0);
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@ -231,8 +252,14 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
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* share the same one
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*/
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if (!base) {
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iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_request_and_ioremap(&pdev->dev, iores);
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if (np) {
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parent = of_get_parent(np);
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base = of_iomap(parent, 0);
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of_node_put(parent);
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} else {
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iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_request_and_ioremap(&pdev->dev, iores);
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}
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if (!base)
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return -EADDRNOTAVAIL;
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}
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@ -278,6 +305,7 @@ static struct platform_driver mxs_gpio_driver = {
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.driver = {
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.name = "gpio-mxs",
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.owner = THIS_MODULE,
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.of_match_table = mxs_gpio_dt_ids,
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},
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.probe = mxs_gpio_probe,
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.id_table = mxs_gpio_ids,
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