[PATCH v3] uio/pdrv_genirq: Add OF support

[Michal Simek]

Adding OF binding to genirq.
Version string is setup to the "devicetree".

Compatible string is not setup for now but you can add your
custom compatible string to uio_of_genirq_match structure.

For example with "uio" compatible string:
static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
        { .compatible = "uio", },
        { /* empty for now */ },
};

Signed-off-by: Michal Simek <mon...@monstr.eu>

---

v3: Fix irq binding
    Use "devicetree" as version string

v2: Remove additional resource binding
    Setup correct version string
    Clear compatible string
---
 drivers/uio/uio_pdrv_genirq.c |   42 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
index 7174d51..c8d565a 100644
--- a/drivers/uio/uio_pdrv_genirq.c
+++ b/drivers/uio/uio_pdrv_genirq.c
@@ -23,6 +23,10 @@
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
 #define DRIVER_NAME "uio_pdrv_genirq"
 
 struct uio_pdrv_genirq_platdata {
@@ -97,6 +101,30 @@ static int uio_pdrv_genirq_probe(struct platform_device 
*pdev)
        int ret = -EINVAL;
        int i;
 
+       if (!uioinfo) {
+               int irq;
+
+               /* alloc uioinfo for one device */
+               uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
+               if (!uioinfo) {
+                       ret = -ENOMEM;
+                       dev_err(&pdev->dev, "unable to kmalloc\n");
+                       goto bad2;
+               }
+               uioinfo->name = pdev->dev.of_node->name;
+               uioinfo->version = "devicetree";
+
+               /* Multiple IRQs are not supported */
+               irq = platform_get_irq(pdev, 0);
+               if (irq < 0) {
+                       uioinfo->irq = UIO_IRQ_NONE;
+                       dev_info(&pdev->dev, "no IRQ found\n");
+               } else {
+                       uioinfo->irq = irq;
+                       dev_info(&pdev->dev, "irq %d\n", (u32)uioinfo->irq);
+               }
+       }
+
        if (!uioinfo || !uioinfo->name || !uioinfo->version) {
                dev_err(&pdev->dev, "missing platform_data\n");
                goto bad0;
@@ -180,6 +208,10 @@ static int uio_pdrv_genirq_probe(struct platform_device 
*pdev)
        kfree(priv);
        pm_runtime_disable(&pdev->dev);
  bad0:
+       /* kfree uioinfo for CONFIG_OF */
+       if (!pdev->dev.platform_data)
+               kfree(uioinfo);
+ bad2:
        return ret;
 }
 
@@ -215,6 +247,15 @@ static const struct dev_pm_ops uio_pdrv_genirq_dev_pm_ops 
= {
        .runtime_resume = uio_pdrv_genirq_runtime_nop,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
+       { /* empty for now */ },
+};
+MODULE_DEVICE_TABLE(of, uio_of_genirq_match);
+#else
+# define uio_of_genirq_match NULL
+#endif
+
 static struct platform_driver uio_pdrv_genirq = {
        .probe = uio_pdrv_genirq_probe,
        .remove = uio_pdrv_genirq_remove,
@@ -222,6 +263,7 @@ static struct platform_driver uio_pdrv_genirq = {
                .name = DRIVER_NAME,
                .owner = THIS_MODULE,
                .pm = &uio_pdrv_genirq_dev_pm_ops,
+               .of_match_table = uio_of_genirq_match,
        },
 };
 
-- 
1.5.5.6

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