andy.shevchenko at gmail.com
Mon Dec 7 05:18:29 EST 2020
On Fri, Dec 4, 2020 at 4:25 PM Jerome Brunet <jbrunet at baylibre.com> wrote:
> On Fri 04 Dec 2020 at 10:13, Linus Walleij <linus.walleij at linaro.org> wrote:
> This HW only has 8 irqs that can each be mapped to a pin. No direct
> translation can be made, we have to allocate an irq to monitor the line.
> So when gpio_to_irq() was called, we had to do that allocation dynamically
> to return a valid irq number. Since there was no counter part to
> gpio_to_irq(), those allocation cannot be freed during the lifetime of
> the device.
I'm not sure why we are talking about legacy API which should not be used.
Besides that I didn't get what you meant under counterpart API (IRQ
descriptor has a mapping to the IRQ chip which keeps the mapping to
whatever hardware wants).
With Best Regards,
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