Re: [PATCH v2] gpio: davinci: fix gpio selection for OF

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Hi Alexander,

On 03/05/2014 01:21 PM, Alexander Holler wrote:
The driver missed an of_xlate function to translate gpio numbers
as found in the DT to the correct chip and number.

While there I've set #gpio_cells to a fixed value of 2.

I've used gpio-pxa.c as template for those changes and tested my changes
successfully on a da850 board using entries for gpio-leds in a DT. So I didn't
reinvent the wheel but just copied and tested stuff.

Thanks to Grygorii Strashko for the hint to the existing code in gpio-pxa.

Signed-off-by: Alexander Holler <holler@xxxxxxxxxxxxx>
Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>

Looks good to me now. Thanks.

---
  drivers/gpio/gpio-davinci.c | 24 ++++++++++++++++++++++++
  1 file changed, 24 insertions(+)

  Changes in v2: replaced static variables by indirections.

diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index 7629b4f..92574a0 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -172,6 +172,27 @@ of_err:
  	return NULL;
  }

+#ifdef CONFIG_OF_GPIO
+static int davinci_gpio_of_xlate(struct gpio_chip *gc,
+			     const struct of_phandle_args *gpiospec,
+			     u32 *flags)
+{
+	struct davinci_gpio_controller *chips = dev_get_drvdata(gc->dev);
+	struct davinci_gpio_platform_data *pdata = dev_get_platdata(gc->dev);
+
+	if (gpiospec->args[0] > pdata->ngpio)
+		return -EINVAL;
+
+	if (gc != &chips[gpiospec->args[0] / 32].chip)
+		return -EINVAL;
+
+	if (flags)
+		*flags = gpiospec->args[1];
+
+	return gpiospec->args[0] % 32;
+}
+#endif
+
  static int davinci_gpio_probe(struct platform_device *pdev)
  {
  	int i, base;
@@ -236,6 +257,9 @@ static int davinci_gpio_probe(struct platform_device *pdev)
  			chips[i].chip.ngpio = 32;

  #ifdef CONFIG_OF_GPIO
+		chips[i].chip.of_gpio_n_cells = 2;
+		chips[i].chip.of_xlate = davinci_gpio_of_xlate;
+		chips[i].chip.dev = dev;
  		chips[i].chip.of_node = dev->of_node;
  #endif
  		spin_lock_init(&chips[i].lock);


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