Re: [PATCH V7 1/1] drivers/gpio: Altera soft IP GPIO driver and devicetree binding

[Josh Cartwright <joshc@xxxxxxxxxxxxxx>]

On Mon, Apr 07, 2014 at 04:00:43PM +0800, Tien Hock Loh wrote:
> On Wed, Mar 19, 2014 at 6:09 PM, Tien Hock Loh <thloh@xxxxxxxxxx> wrote:
> > On Fri, Mar 7, 2014 at 11:14 PM, Josh Cartwright <joshc@xxxxxxxxxxxxxx> wrote:
> >> On Mon, Mar 03, 2014 at 06:27:43PM +0800, thloh@xxxxxxxxxx wrote:
> >>> From: Tien Hock Loh <thloh@xxxxxxxxxx>
[..]
> >>> +     altera_gc->mapped_irq = irq_of_parse_and_map(node, 0);
> >>>
> >>
> >> platform_get_irq(pdev, 0);
> >>
> > OK.
> >
>
> platform_get_irq doesn't create the irq mapping which is needed by the
> driver. Since this driver is targeted at using of, should I be using
> irq_of_parse_and_map or should I still redo the codes with
> platform_get_irq and irq_create_mapping? I think the latter would be
> introducing code redundancy. Please advice.

Yes, it is technically true that platform_get_irq() doesn't do the
mapping directly, but that's because the mapping is setup earlier, when
of_device_alloc() (drivers/of/platform.c) allocates resources for your
platform device.

Calling irq_of_parse_and_map() should be unnecessary.

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