[PATCH 09/12] gpio/twl: Add DT support to gpio-twl4030 driver
Benoit Cousson
b-cousson at ti.com
Fri Mar 2 11:50:21 EST 2012
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>
---
.../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
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