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Subject: Re: [PATCH v2] gpiolib: Show correct direction from the beginning
From:   Timur Tabi <timur@kernel.org>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Cc:     jhugo@codeaurora.org, swboyd@chromium.org,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        linux-gpio@vger.kernel.org
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Date:   Sat, 29 Sep 2018 08:25:30 -0500
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On 9/29/18 8:21 AM, Timur Tabi wrote:
> 
>> Is it possible to access the hardware?
> 
> Linaro and some Linux OSVs should still have systems, but I usually just 
> ask Jeff to test code for me.

Alternatively, you can just add valid_mask support to your driver, and 
add a check to your get_direction() function to see if it ever is asked 
to access an invalid GPIO.