Re: [PATCH] gpio: pl061: hook request if gpio-ranges avaiable

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Nov 28, 2014 at 6:00 PM, Haojian Zhuang
<haojian.zhuang@xxxxxxxxxx> wrote:

> It's a bit different.
>
> The commit 51e13c2475 is used to fix this scenario. There're 8 gpio
>  pins in GPIO CHIP #19. There're pin muxing on gpio152 -
>  gpio155. And there're _no_ pin muxing on gpio156 - gpio159. When
> user tries to request gpio159, he'll meet failure since the pinctrl device
> can't cover gpio159. But the pinctrl device is already register for
> gpio152. In order to distinguish whether the pinctrl device registered,
> I added pinctrl_ready_for_gpio_range(gpio).
>
> In another scenario, there's no back-end pinctrl device for GPIO
> CHIP #0. So pinctrl_request_gpio() always returns EPROBE_DEFER.
> The commit 51e13c2475 can't cover this.
>
> I suggest to write code in below.

This looks much simpler. Anyway: Xinwei whatever you come up
with, include Haojian on To: and get is ACK on the solution.

Yours,
Linus Walleij
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