Thread (23 messages) 23 messages, 5 authors, 2013-11-19

[PATCH v5 5/7] gpio: davinci: add OF support

From: prabhakar.csengg@gmail.com (Prabhakar Lad)
Date: 2013-11-11 15:37:37
Also in: linux-devicetree, linux-gpio, lkml

Hi Grygorii,

Thanks for the review.

On Mon, Nov 11, 2013 at 8:48 PM, Grygorii Strashko
[off-list ref] wrote:
On 11/08/2013 12:11 PM, Prabhakar Lad wrote:
[Snip]
quoted
@@ -134,6 +137,40 @@ davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
      writel((1 << offset), value ? &g->set_data : &g->clr_data);
  }

+static struct davinci_gpio_platform_data *
+davinci_gpio_get_pdata(struct platform_device *pdev)
Minor: usually such functions have "_of" in their names:
 davinci_gpio_of_get_pdata()
Ahh but actual this function is intended to get pdata in both the
cases DT and NON-DT, so kept it generic :)
quoted hunk ↗ jump to hunk
quoted
+{
+     struct device_node *dn = pdev->dev.of_node;
+     struct davinci_gpio_platform_data *pdata;
+     int ret;
+     u32 val;
+
+     if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
+             return pdev->dev.platform_data;
+
+     pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+     if (!pdata)
+             return NULL;
+
+     ret = of_property_read_u32(dn, "ti,ngpio", &val);
+     if (ret)
+             goto of_err;
+
+     pdata->ngpio = val;
+
+     ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
+     if (ret)
+             goto of_err;
+
+     pdata->gpio_unbanked = val;
+
+     return pdata;
+
+of_err:
+     dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
+     return NULL;
+}
+
  static int davinci_gpio_probe(struct platform_device *pdev)
  {
      int i, base;
@@ -144,12 +181,14 @@ static int davinci_gpio_probe(struct platform_device *pdev)
      struct device *dev = &pdev->dev;
      struct resource *res;

-     pdata = dev->platform_data;
+     pdata = davinci_gpio_get_pdata(pdev);
      if (!pdata) {
              dev_err(dev, "No platform data found\n");
              return -EINVAL;
      }

+     dev->platform_data = pdata;
+
Pls, add following code to GPIO chip initialization:
@@ -233,6 +245,9 @@ static int davinci_gpio_probe(struct platform_device *pdev)
                chips[i].chip.ngpio = ngpio - base;
                if (chips[i].chip.ngpio > 32)
                        chips[i].chip.ngpio = 32;
+#ifdef CONFIG_OF_GPIO
+               chips[i].chip.of_node = dev->of_node;
+#endif
OK

Regards,
--Prabhakar Lad
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