Jon
Because there isn't an actual IRQ for each pin, they need to be
virtual. The alternative is to have multiple drivers all wanting the
same IRQ
Steve
On Jun 3, 2010, at 6:30 AM, Jon Povey <[email protected]> wrote:
I have spent today convinced something was wrong with gpio_to_irq()
on DM355, and am slowly getting round to thinking that things are as
intended, with confusing side effects.
Namely, gpio_to_irq(1) returns 65, which eth0 reports on boot:
eth0: dm9000a at c8814000,c8818002 IRQ 65 MAC: 06:06:0b:0b:06:06
(eeprom)
And everything works. DM355 highest IRQ is 63. eth0 is actually
using IRQ 54 (GPIOBNK0) and this "IRQ" seems to be not really an IRQ
but an abstracted index number. This makes me confused and sad :(
Under 2.6.10 it used to be a real, honest-to-hardware IRQ:
eth0: dm9000 at c7810000,c7812002 IRQ 45 MAC: 00:50:c2:68:00:10
I think I see why this has been done, but it makes me wonder how we
might report real IRQs instead..
Mailing so someone might say "that's as intended, you did indeed
waste your day" or (unlikely) "well spotted, that's not right."
--
Jon Povey
[email protected]
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