[PATCH 09/12] gpio/twl: Add DT support to gpio-twl4030 driver
Grant Likely
grant.likely at secretlab.ca
Mon Mar 12 13:48:12 EDT 2012
On Fri, 2 Mar 2012 17:50:21 +0100, Benoit Cousson <b-cousson at ti.com> wrote:
> Add the DT support for the I2C GPIO expander inside the twl4030.
>
> Signed-off-by: Benoit Cousson <b-cousson at ti.com>
> Acked-by: Felipe Balbi <balbi at ti.com>
Acked-by: Grant Likely <grant.likely at secretlab.ca>
> ---
> .../devicetree/bindings/gpio/gpio-twl4030.txt | 23 ++++++
> drivers/gpio/gpio-twl4030.c | 79 ++++++++++++-------
> 2 files changed, 73 insertions(+), 29 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-twl4030.txt
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-twl4030.txt b/Documentation/devicetree/bindings/gpio/gpio-twl4030.txt
> new file mode 100644
> index 0000000..16695d9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-twl4030.txt
> @@ -0,0 +1,23 @@
> +twl4030 GPIO controller bindings
> +
> +Required properties:
> +- compatible:
> + - "ti,twl4030-gpio" for twl4030 GPIO controller
> +- #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 2.
> +- interrupt-controller: Mark the device node as an interrupt controller
> + The first cell is the GPIO number.
> + The second cell is not used.
> +
> +Example:
> +
> +twl_gpio: gpio {
> + compatible = "ti,twl4030-gpio";
> + #gpio-cells = <2>;
> + gpio-controller;
> + #interrupt-cells = <2>;
> + interrupt-controller;
> +};
> diff --git a/drivers/gpio/gpio-twl4030.c b/drivers/gpio/gpio-twl4030.c
> index 49e5c6e..94256fe 100644
> --- a/drivers/gpio/gpio-twl4030.c
> +++ b/drivers/gpio/gpio-twl4030.c
> @@ -32,6 +32,8 @@
> #include <linux/irq.h>
> #include <linux/gpio.h>
> #include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/irqdomain.h>
>
> #include <linux/i2c/twl.h>
>
> @@ -256,7 +258,8 @@ static int twl_request(struct gpio_chip *chip, unsigned offset)
> * and vMMC2 power supplies based on card presence.
> */
> pdata = chip->dev->platform_data;
> - value |= pdata->mmc_cd & 0x03;
> + if (pdata)
> + value |= pdata->mmc_cd & 0x03;
>
> status = gpio_twl4030_write(REG_GPIO_CTRL, value);
> }
> @@ -395,6 +398,7 @@ static int gpio_twl4030_remove(struct platform_device *pdev);
> static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
> {
> struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
> + struct device_node *node = pdev->dev.of_node;
> int ret, irq_base;
>
> /* maybe setup IRQs */
> @@ -409,6 +413,9 @@ static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
> return irq_base;
> }
>
> + irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
> + &irq_domain_simple_ops, NULL);
> +
> ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
> if (ret < 0)
> return ret;
> @@ -416,40 +423,45 @@ static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
> twl4030_gpio_irq_base = irq_base;
>
> no_irqs:
> - /*
> - * NOTE: boards may waste power if they don't set pullups
> - * and pulldowns correctly ... default for non-ULPI pins is
> - * pulldown, and some other pins may have external pullups
> - * or pulldowns. Careful!
> - */
> - ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
> - if (ret)
> - dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
> - pdata->pullups, pdata->pulldowns,
> - ret);
> -
> - ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
> - if (ret)
> - dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
> - pdata->debounce, pdata->mmc_cd,
> - ret);
> -
> - twl_gpiochip.base = pdata->gpio_base;
> + twl_gpiochip.base = -1;
> twl_gpiochip.ngpio = TWL4030_GPIO_MAX;
> twl_gpiochip.dev = &pdev->dev;
>
> - /* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
> - * is (still) clear if use_leds is set.
> - */
> - if (pdata->use_leds)
> - twl_gpiochip.ngpio += 2;
> + if (pdata) {
> + twl_gpiochip.base = pdata->gpio_base;
> +
> + /*
> + * NOTE: boards may waste power if they don't set pullups
> + * and pulldowns correctly ... default for non-ULPI pins is
> + * pulldown, and some other pins may have external pullups
> + * or pulldowns. Careful!
> + */
> + ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
> + if (ret)
> + dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
> + pdata->pullups, pdata->pulldowns,
> + ret);
> +
> + ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
> + if (ret)
> + dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
> + pdata->debounce, pdata->mmc_cd,
> + ret);
> +
> + /*
> + * NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
> + * is (still) clear if use_leds is set.
> + */
> + if (pdata->use_leds)
> + twl_gpiochip.ngpio += 2;
> + }
>
> ret = gpiochip_add(&twl_gpiochip);
> if (ret < 0) {
> dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
> twl_gpiochip.ngpio = 0;
> gpio_twl4030_remove(pdev);
> - } else if (pdata->setup) {
> + } else if (pdata && pdata->setup) {
> int status;
>
> status = pdata->setup(&pdev->dev,
> @@ -467,7 +479,7 @@ static int gpio_twl4030_remove(struct platform_device *pdev)
> struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
> int status;
>
> - if (pdata->teardown) {
> + if (pdata && pdata->teardown) {
> status = pdata->teardown(&pdev->dev,
> pdata->gpio_base, TWL4030_GPIO_MAX);
> if (status) {
> @@ -488,12 +500,21 @@ static int gpio_twl4030_remove(struct platform_device *pdev)
> return -EIO;
> }
>
> +static const struct of_device_id twl_gpio_match[] = {
> + { .compatible = "ti,twl4030-gpio", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, twl_gpio_match);
> +
> /* Note: this hardware lives inside an I2C-based multi-function device. */
> MODULE_ALIAS("platform:twl4030_gpio");
>
> static struct platform_driver gpio_twl4030_driver = {
> - .driver.name = "twl4030_gpio",
> - .driver.owner = THIS_MODULE,
> + .driver = {
> + .name = "twl4030_gpio",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(twl_gpio_match),
> + },
> .probe = gpio_twl4030_probe,
> .remove = gpio_twl4030_remove,
> };
> --
> 1.7.0.4
>
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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