Re: [PATCH] of/irq: Export of_irq_count()

[Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

On 12/22, Rob Herring wrote:
> On Tue, Dec 22, 2015 at 6:22 AM, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> > Some of the Qualcomm pinctrl drivers have started trying to use
> > of_irq_count() in modular code but this fails to build as the symbol is
> > not exported.  Since there doesn't seem to be any reason not to export
> > the symbol make it available to modules.
> 
> The reason it has not been exported is because we want to stick with
> the platform_* APIs for IRQs. There's not really an equivalent
> function though. Perhaps we should make one? Usually it is just used
> for allocating some driver data. If that is the case, is it really
> enough data to not just allocate the max?
> 

It's mostly used for allocation but we also do some pin type
discovery by reading registers and that would fail if we went
past the actual number of pins there are.

So how about implementing platform_irq_count()? I'd like to keep
these drivers as tristate if possible.

----8<----
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index d77ed0c946dd..421c67f8fdef 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -118,6 +118,25 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
 EXPORT_SYMBOL_GPL(platform_get_irq);
 
 /**
+ * platform_irq_count - Count the number of IRQs a platform device uses
+ * @dev: platform device
+ *
+ * Return: Number of IRQs a platform device uses or EPROBE_DEFER
+ */
+int platform_irq_count(struct platform_device *dev)
+{
+	int ret, nr = 0;
+
+	while ((ret = platform_get_irq(dev, nr)) == 0)
+		nr++;
+
+	if (ret == -EPROBE_DEFER)
+		return ret;
+
+	return nr;
+}
+
+/**
  * platform_get_resource_byname - get a resource for a device by name
  * @dev: platform device
  * @type: resource type

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