linux-kernel - Re: [PATCH v2] gpiolib: Show correct direction from the beginning

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Message-ID: <aa06e450-84a7-11f9-3972-08f1c9dbd1c4@kernel.org>
Date:   Tue, 2 Oct 2018 07:26:47 -0500
From:   Timur Tabi <timur@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     jhugo@...eaurora.org, Stephen Boyd <swboyd@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v2] gpiolib: Show correct direction from the beginning

On 10/2/18 2:38 AM, Linus Walleij wrote:
>> But as today the only driver that seems to be using valid_mask is msm,
>> so perhaps a hack is something better and then when we have a second
>> driver that requires it we figure out the real requirements. But it is
>> definately your decision;)

Please note that MSM is supposed to be the *first* driver, not the only, 
driver that needs valid_mask.  So let's not make any code changes that 
limit this feature to the MSM driver.

> I would just add some exported function to gpiolib to do what you
> need so you can set up the valid_mask before calling
> gpiochip_add*.

I think that should be okay.  Drivers should know pretty early whether 
they need valid_mask or not.