gpio-rcar: Add DT support
Add DT bindings for the gpio-rcar driver and read the device configuration from the DT node at probe time if available. Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
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@ -0,0 +1,52 @@
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* Renesas R-Car GPIO Controller
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Required Properties:
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- compatible: should be one of the following.
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- "renesas,gpio-r8a7778": for R8A7778 (R-Mobile M1) compatible GPIO controller.
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- "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller.
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- "renesas,gpio-r8a7790": for R8A7790 (R-Car H2) compatible GPIO controller.
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- "renesas,gpio-rcar": for generic R-Car GPIO controller.
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- reg: Base address and length of each memory resource used by the GPIO
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controller hardware module.
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- interrupt-parent: phandle of the parent interrupt controller.
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- interrupts: Interrupt specifier for the controllers interrupt.
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- gpio-controller: Marks the device node as a gpio controller.
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- #gpio-cells: Should be 2. The first cell is the GPIO number and the second
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cell is used to specify optional parameters as bit flags. Only the GPIO
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active low flag (bit 0) is currently supported.
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- gpio-ranges: Range of pins managed by the GPIO controller as a 4-cells
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tuple using the following syntax.
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<[phandle of the pin controller node]
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0
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[index of the first pin]
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[number of pins]>
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Please refer to gpio.txt in this directory for details of the common GPIO
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bindings used by client devices.
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Example: R8A7779 (R-Car H1) GPIO controller nodes
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gpio0: gpio@ffc40000 {
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compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
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reg = <0xffc40000 0x2c>;
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interrupt-parent = <&gic>;
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interrupts = <0 141 0x4>;
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#gpio-cells = <2>;
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gpio-controller;
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gpio-ranges = <&pfc 0 0 32>;
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};
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...
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gpio6: gpio@ffc46000 {
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compatible = "renesas,gpio-r8a7779", "renesas,gpio-rcar";
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reg = <0xffc46000 0x2c>;
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interrupt-parent = <&gic>;
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interrupts = <0 147 0x4>;
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#gpio-cells = <2>;
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gpio-controller;
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gpio-ranges = <&pfc 0 192 9>;
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};
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@ -51,6 +51,8 @@ struct gpio_rcar_priv {
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#define FILONOFF 0x28
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#define BOTHEDGE 0x4c
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#define RCAR_MAX_GPIO_PER_BANK 32
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static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
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{
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return ioread32(p->base + offs);
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@ -274,9 +276,39 @@ static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
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.map = gpio_rcar_irq_domain_map,
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};
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static void gpio_rcar_parse_pdata(struct gpio_rcar_priv *p)
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{
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struct gpio_rcar_config *pdata = p->pdev->dev.platform_data;
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#ifdef CONFIG_OF
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struct device_node *np = p->pdev->dev.of_node;
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struct of_phandle_args args;
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int ret;
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#endif
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if (pdata)
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p->config = *pdata;
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#ifdef CONFIG_OF
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else if (np) {
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ret = of_parse_phandle_with_args(np, "gpio-ranges",
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"#gpio-range-cells", 0, &args);
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p->config.number_of_pins = ret == 0 && args.args_count == 3
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? args.args[2]
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: RCAR_MAX_GPIO_PER_BANK;
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p->config.gpio_base = -1;
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}
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#endif
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if (p->config.number_of_pins == 0 ||
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p->config.number_of_pins > RCAR_MAX_GPIO_PER_BANK) {
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dev_warn(&p->pdev->dev,
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"Invalid number of gpio lines %u, using %u\n",
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p->config.number_of_pins, RCAR_MAX_GPIO_PER_BANK);
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p->config.number_of_pins = RCAR_MAX_GPIO_PER_BANK;
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}
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}
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static int gpio_rcar_probe(struct platform_device *pdev)
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{
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struct gpio_rcar_config *pdata = pdev->dev.platform_data;
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struct gpio_rcar_priv *p;
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struct resource *io, *irq;
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struct gpio_chip *gpio_chip;
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@ -291,14 +323,14 @@ static int gpio_rcar_probe(struct platform_device *pdev)
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goto err0;
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}
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/* deal with driver instance configuration */
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if (pdata)
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p->config = *pdata;
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p->pdev = pdev;
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platform_set_drvdata(pdev, p);
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spin_lock_init(&p->lock);
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/* Get device configuration from DT node or platform data. */
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gpio_rcar_parse_pdata(p);
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platform_set_drvdata(pdev, p);
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io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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@ -325,6 +357,7 @@ static int gpio_rcar_probe(struct platform_device *pdev)
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gpio_chip->set = gpio_rcar_set;
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gpio_chip->to_irq = gpio_rcar_to_irq;
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gpio_chip->label = name;
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gpio_chip->dev = &pdev->dev;
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gpio_chip->owner = THIS_MODULE;
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gpio_chip->base = p->config.gpio_base;
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gpio_chip->ngpio = p->config.number_of_pins;
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@ -371,10 +404,12 @@ static int gpio_rcar_probe(struct platform_device *pdev)
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p->config.irq_base, ret);
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}
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ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
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gpio_chip->base, gpio_chip->ngpio);
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if (ret < 0)
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dev_warn(&pdev->dev, "failed to add pin range\n");
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if (p->config.pctl_name) {
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ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
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gpio_chip->base, gpio_chip->ngpio);
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if (ret < 0)
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dev_warn(&pdev->dev, "failed to add pin range\n");
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}
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return 0;
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@ -397,11 +432,22 @@ static int gpio_rcar_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id gpio_rcar_of_table[] = {
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{
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.compatible = "renesas,gpio-rcar",
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},
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};
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MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
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#endif
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static struct platform_driver gpio_rcar_device_driver = {
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.probe = gpio_rcar_probe,
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.remove = gpio_rcar_remove,
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.driver = {
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.name = "gpio_rcar",
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.of_match_table = of_match_ptr(gpio_rcar_of_table),
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}
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};
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