[PATCH 3/5] gpio/omap: Add DT support to GPIO driver
Rob Herring
robherring2 at gmail.com
Wed Feb 22 09:23:18 EST 2012
On 02/15/2012 10:04 AM, Benoit Cousson wrote:
> Adapt the GPIO driver to retrieve information from a DT file.
>
> Allocate the irq_base dynamically and rename bank->virtual_irq_start
> to bank->irq_base.
> Change irq_base type to int instead of u16 to match irq_alloc_descs
> output.
>
> Add documentation for GPIO properties specific to OMAP.
>
> Signed-off-by: Benoit Cousson <b-cousson at ti.com>
> Cc: Tarun Kanti DebBarma <tarun.kanti at ti.com>
One comment below, but otherwise:
Acked-by: Rob Herring <rob.herring at calxeda.com>
> ---
> .../devicetree/bindings/gpio/gpio-omap.txt | 30 +++++
> drivers/gpio/gpio-omap.c | 121 ++++++++++++++++++--
> 2 files changed, 142 insertions(+), 9 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-omap.txt
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-omap.txt b/Documentation/devicetree/bindings/gpio/gpio-omap.txt
> new file mode 100644
> index 0000000..c1b3100
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-omap.txt
> @@ -0,0 +1,30 @@
> +OMAP GPIO controller bindings
> +
> +Required properties:
> +- compatible:
> + - "ti,omap2-gpio" for OMAP2 controllers
> + - "ti,omap3-gpio" for OMAP3 controllers
> + - "ti,omap4-gpio" for OMAP4 controllers
> +- #gpio-cells : Should be two.
> + - first cell is the pin number
> + - second cell is used to specify optional parameters (unused)
> +- gpio-controller : Marks the device node as a GPIO controller.
> +- #interrupt-cells : Should be one
There's no level/edge settings for gpios?
> +- interrupt-controller: Mark the device node as an interrupt controller
> +
> +OMAP specific properties:
> +- ti,hwmods: Name of the hwmod associated to the GPIO:
> + "gpio<X>", <X> being the 1-based instance number from the HW spec
> +
> +
> +Example:
> +
> +gpio4: gpio4 {
> + compatible = "ti,omap4-gpio";
> + ti,hwmods = "gpio4";
> + #gpio-cells = <2>;
> + gpio-controller;
> + #interrupt-cells = <1>;
> + interrupt-controller;
> +};
> +
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index c3a9dc8..bc2bd69 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -22,6 +22,9 @@
> #include <linux/device.h>
> #include <linux/pm_runtime.h>
> #include <linux/pm.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/irqdomain.h>
>
> #include <mach/hardware.h>
> #include <asm/irq.h>
> @@ -52,7 +55,8 @@ struct gpio_bank {
> struct list_head node;
> void __iomem *base;
> u16 irq;
> - u16 virtual_irq_start;
> + int irq_base;
> + struct irq_domain *domain;
> u32 suspend_wakeup;
> u32 saved_wakeup;
> u32 non_wakeup_gpios;
> @@ -669,7 +673,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> if (!isr)
> break;
>
> - gpio_irq = bank->virtual_irq_start;
> + gpio_irq = bank->irq_base;
> for (; isr != 0; isr >>= 1, gpio_irq++) {
> gpio_index = GPIO_INDEX(bank, irq_to_gpio(gpio_irq));
>
> @@ -915,7 +919,7 @@ static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
> struct gpio_bank *bank;
>
> bank = container_of(chip, struct gpio_bank, chip);
> - return bank->virtual_irq_start + offset;
> + return bank->irq_base + offset;
> }
>
> /*---------------------------------------------------------------------*/
> @@ -1028,8 +1032,7 @@ static void __devinit omap_gpio_chip_init(struct gpio_bank *bank)
>
> gpiochip_add(&bank->chip);
>
> - for (j = bank->virtual_irq_start;
> - j < bank->virtual_irq_start + bank->width; j++) {
> + for (j = bank->irq_base; j < bank->irq_base + bank->width; j++) {
> irq_set_lockdep_class(j, &gpio_lock_class);
> irq_set_chip_data(j, bank);
> if (bank->is_mpuio) {
> @@ -1044,15 +1047,22 @@ static void __devinit omap_gpio_chip_init(struct gpio_bank *bank)
> irq_set_handler_data(bank->irq, bank);
> }
>
> +static const struct of_device_id omap_gpio_match[];
> +
> static int __devinit omap_gpio_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + const struct of_device_id *match;
> struct omap_gpio_platform_data *pdata;
> struct resource *res;
> struct gpio_bank *bank;
> int ret = 0;
>
> - if (!dev->platform_data)
> + match = of_match_device(of_match_ptr(omap_gpio_match), dev);
> +
> + pdata = match ? match->data : dev->platform_data;
> + if (!pdata)
> return -EINVAL;
>
> bank = devm_kzalloc(&pdev->dev, sizeof(struct gpio_bank), GFP_KERNEL);
> @@ -1068,9 +1078,6 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
> }
>
> bank->irq = res->start;
> -
> - pdata = pdev->dev.platform_data;
> - bank->virtual_irq_start = pdata->virtual_irq_start;
> bank->dev = dev;
> bank->dbck_flag = pdata->dbck_flag;
> bank->stride = pdata->bank_stride;
> @@ -1080,6 +1087,18 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
> bank->loses_context = pdata->loses_context;
> bank->get_context_loss_count = pdata->get_context_loss_count;
> bank->regs = pdata->regs;
> +#ifdef CONFIG_OF_GPIO
> + bank->chip.of_node = of_node_get(node);
> +#endif
> +
> + bank->irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
> + if (bank->irq_base < 0) {
> + dev_err(dev, "Couldn't allocate IRQ numbers\n");
> + return -ENODEV;
> + }
> +
> + bank->domain = irq_domain_add_legacy(node, bank->width, bank->irq_base,
> + 0, &irq_domain_simple_ops, NULL);
>
> if (bank->regs->set_dataout && bank->regs->clr_dataout)
> bank->set_dataout = _set_gpio_dataout_reg;
> @@ -1387,11 +1406,95 @@ static const struct dev_pm_ops gpio_pm_ops = {
> NULL)
> };
>
> +#if defined(CONFIG_OF)
> +static struct omap_gpio_reg_offs omap2_gpio_regs = {
> + .revision = OMAP24XX_GPIO_REVISION,
> + .direction = OMAP24XX_GPIO_OE,
> + .datain = OMAP24XX_GPIO_DATAIN,
> + .dataout = OMAP24XX_GPIO_DATAOUT,
> + .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
> + .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
> + .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
> + .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
> + .irqenable = OMAP24XX_GPIO_IRQENABLE1,
> + .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
> + .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
> + .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
> + .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
> + .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
> + .ctrl = OMAP24XX_GPIO_CTRL,
> + .wkup_en = OMAP24XX_GPIO_WAKE_EN,
> + .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
> + .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
> + .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
> + .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
> +};
> +
> +static struct omap_gpio_reg_offs omap4_gpio_regs = {
> + .revision = OMAP4_GPIO_REVISION,
> + .direction = OMAP4_GPIO_OE,
> + .datain = OMAP4_GPIO_DATAIN,
> + .dataout = OMAP4_GPIO_DATAOUT,
> + .set_dataout = OMAP4_GPIO_SETDATAOUT,
> + .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
> + .irqstatus = OMAP4_GPIO_IRQSTATUS0,
> + .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
> + .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
> + .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
> + .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
> + .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
> + .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
> + .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
> + .ctrl = OMAP4_GPIO_CTRL,
> + .wkup_en = OMAP4_GPIO_IRQWAKEN0,
> + .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
> + .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
> + .risingdetect = OMAP4_GPIO_RISINGDETECT,
> + .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
> +};
> +
> +static struct omap_gpio_platform_data omap2_pdata = {
> + .regs = &omap2_gpio_regs,
> + .bank_width = 32,
> + .dbck_flag = false,
> +};
> +
> +static struct omap_gpio_platform_data omap3_pdata = {
> + .regs = &omap2_gpio_regs,
> + .bank_width = 32,
> + .dbck_flag = true,
> +};
> +
> +static struct omap_gpio_platform_data omap4_pdata = {
> + .regs = &omap4_gpio_regs,
> + .bank_width = 32,
> + .dbck_flag = true,
> +};
> +
> +static const struct of_device_id omap_gpio_match[] = {
> + {
> + .compatible = "ti,omap4-gpio",
> + .data = &omap4_pdata,
> + },
> + {
> + .compatible = "ti,omap3-gpio",
> + .data = &omap3_pdata,
> + },
> + {
> + .compatible = "ti,omap2-gpio",
> + .data = &omap2_pdata,
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, omap_gpio_match);
> +#endif
> +
> static struct platform_driver omap_gpio_driver = {
> .probe = omap_gpio_probe,
> .driver = {
> .name = "omap_gpio",
> .pm = &gpio_pm_ops,
> + .of_match_table = of_match_ptr(omap_gpio_match),
> },
> };
>
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