Re: [PATCH 1/3] pinctrl: Intel: add RX invertion config

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Mon, Mar 14, 2016 at 9:56 AM, Zheng, Qi <qi.zheng@xxxxxxxxx> wrote:

> The "pi330532" device on Broxton requires this function to manually
> trigger an GPIO input interrupt.
(...)
> We have gone through this requirement from CHT to BXT, there was no
> other better way to simulate the GPIO interrupt for the use of those devices.

I what you want is to trigger IRQs on GPIO lines using software
we need to add that to the GPIOlib subsystem, so this register
gets accessed from the GPIO side of things, not through pin control
I think?

We have so many diverse function pointers in the gpiochip, so
ability to trigger/test IRQs from software is certainly not a burden.

I don't understand the real-world usecase though, please explain
what kind of problem this is trying to overcome? Why does this
pi330532 driver need to do that, why can it not just inform the
driver that needs this interrupt that it should wake up, e.g by
using a notification or just an open-coded function call or whatever?

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe linux-gpio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html