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gpio/twl: Add DT support to gpio-twl4030 driver
Add the DT support for the I2C GPIO expander inside the twl4030. Note: The pdata parameters still have to be properly adapted using dedicated bindings. Signed-off-by: Benoit Cousson <b-cousson@ti.com> Acked-by: Felipe Balbi <balbi@ti.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Benoit Cousson
Samuel Ortiz
parent
2d9dd99b44
commit
b8589e2a80
23
Documentation/devicetree/bindings/gpio/gpio-twl4030.txt
Normal file
23
Documentation/devicetree/bindings/gpio/gpio-twl4030.txt
Normal file
@ -0,0 +1,23 @@
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twl4030 GPIO controller bindings
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Required properties:
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- compatible:
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- "ti,twl4030-gpio" for twl4030 GPIO controller
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- #gpio-cells : Should be two.
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- first cell is the pin number
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- second cell is used to specify optional parameters (unused)
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- gpio-controller : Marks the device node as a GPIO controller.
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- #interrupt-cells : Should be 2.
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- interrupt-controller: Mark the device node as an interrupt controller
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The first cell is the GPIO number.
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The second cell is not used.
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Example:
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twl_gpio: gpio {
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compatible = "ti,twl4030-gpio";
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#gpio-cells = <2>;
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gpio-controller;
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#interrupt-cells = <2>;
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interrupt-controller;
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};
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@ -32,6 +32,8 @@
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/irqdomain.h>
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#include <linux/i2c/twl.h>
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@ -256,7 +258,8 @@ static int twl_request(struct gpio_chip *chip, unsigned offset)
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* and vMMC2 power supplies based on card presence.
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*/
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pdata = chip->dev->platform_data;
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value |= pdata->mmc_cd & 0x03;
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if (pdata)
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value |= pdata->mmc_cd & 0x03;
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status = gpio_twl4030_write(REG_GPIO_CTRL, value);
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}
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@ -395,6 +398,7 @@ static int gpio_twl4030_remove(struct platform_device *pdev);
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static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
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{
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struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
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struct device_node *node = pdev->dev.of_node;
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int ret, irq_base;
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/* maybe setup IRQs */
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@ -409,6 +413,9 @@ static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
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return irq_base;
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}
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irq_domain_add_legacy(node, TWL4030_GPIO_MAX, irq_base, 0,
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&irq_domain_simple_ops, NULL);
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ret = twl4030_sih_setup(&pdev->dev, TWL4030_MODULE_GPIO, irq_base);
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if (ret < 0)
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return ret;
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@ -416,40 +423,45 @@ static int __devinit gpio_twl4030_probe(struct platform_device *pdev)
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twl4030_gpio_irq_base = irq_base;
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no_irqs:
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/*
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* NOTE: boards may waste power if they don't set pullups
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* and pulldowns correctly ... default for non-ULPI pins is
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* pulldown, and some other pins may have external pullups
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* or pulldowns. Careful!
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*/
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ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
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if (ret)
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dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
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pdata->pullups, pdata->pulldowns,
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ret);
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ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
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if (ret)
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dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
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pdata->debounce, pdata->mmc_cd,
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ret);
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twl_gpiochip.base = pdata->gpio_base;
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twl_gpiochip.base = -1;
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twl_gpiochip.ngpio = TWL4030_GPIO_MAX;
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twl_gpiochip.dev = &pdev->dev;
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/* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
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* is (still) clear if use_leds is set.
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*/
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if (pdata->use_leds)
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twl_gpiochip.ngpio += 2;
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if (pdata) {
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twl_gpiochip.base = pdata->gpio_base;
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/*
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* NOTE: boards may waste power if they don't set pullups
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* and pulldowns correctly ... default for non-ULPI pins is
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* pulldown, and some other pins may have external pullups
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* or pulldowns. Careful!
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*/
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ret = gpio_twl4030_pulls(pdata->pullups, pdata->pulldowns);
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if (ret)
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dev_dbg(&pdev->dev, "pullups %.05x %.05x --> %d\n",
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pdata->pullups, pdata->pulldowns,
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ret);
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ret = gpio_twl4030_debounce(pdata->debounce, pdata->mmc_cd);
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if (ret)
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dev_dbg(&pdev->dev, "debounce %.03x %.01x --> %d\n",
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pdata->debounce, pdata->mmc_cd,
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ret);
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/*
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* NOTE: we assume VIBRA_CTL.VIBRA_EN, in MODULE_AUDIO_VOICE,
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* is (still) clear if use_leds is set.
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*/
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if (pdata->use_leds)
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twl_gpiochip.ngpio += 2;
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}
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ret = gpiochip_add(&twl_gpiochip);
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if (ret < 0) {
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dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
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twl_gpiochip.ngpio = 0;
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gpio_twl4030_remove(pdev);
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} else if (pdata->setup) {
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} else if (pdata && pdata->setup) {
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int status;
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status = pdata->setup(&pdev->dev,
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@ -467,7 +479,7 @@ static int gpio_twl4030_remove(struct platform_device *pdev)
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struct twl4030_gpio_platform_data *pdata = pdev->dev.platform_data;
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int status;
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if (pdata->teardown) {
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if (pdata && pdata->teardown) {
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status = pdata->teardown(&pdev->dev,
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pdata->gpio_base, TWL4030_GPIO_MAX);
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if (status) {
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@ -488,12 +500,21 @@ static int gpio_twl4030_remove(struct platform_device *pdev)
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return -EIO;
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}
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static const struct of_device_id twl_gpio_match[] = {
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{ .compatible = "ti,twl4030-gpio", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, twl_gpio_match);
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/* Note: this hardware lives inside an I2C-based multi-function device. */
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MODULE_ALIAS("platform:twl4030_gpio");
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static struct platform_driver gpio_twl4030_driver = {
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.driver.name = "twl4030_gpio",
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.driver.owner = THIS_MODULE,
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.driver = {
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.name = "twl4030_gpio",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(twl_gpio_match),
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},
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.probe = gpio_twl4030_probe,
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.remove = gpio_twl4030_remove,
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};
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