linux-kernel - Re: [PATCH v3 2/3] gpiolib: Support 'gpio-reserved-ranges' property

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Message-ID: <CACRpkdbg40yaKVbo-b6UKAYfGpT2ZLDdXaPKgEn-4zGL4mKuag@mail.gmail.com>
Date:   Tue, 27 Mar 2018 15:24:16 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-arm-msm@...r.kernel.org,
        Timur Tabi <timur@...eaurora.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Grant Likely <grant.likely@...retlab.ca>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/3] gpiolib: Support 'gpio-reserved-ranges' property

On Wed, Mar 21, 2018 at 8:59 PM, Stephen Boyd <swboyd@...omium.org> wrote:
> Quoting Andy Shevchenko (2018-03-21 10:59:10)
>> On Wed, 2018-03-21 at 09:58 -0700, Stephen Boyd wrote:
>> > From: Stephen Boyd <sboyd@...eaurora.org>
>> >
>> > Some qcom platforms make some GPIOs or pins unavailable for use by
>> > non-secure operating systems, and thus reading or writing the
>> > registers
>> > for those pins will cause access control issues. Add support for a DT
>> > property to describe the set of GPIOs that are available for use so
>> > that
>> > higher level OSes are able to know what pins to avoid reading/writing.
>> > Non-DT platforms can add support by directly updating the
>> > chip->valid_mask.
>>
>> > Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
>> > Signed-off-by: Stephen Boyd <swboyd@...omium.org>
>>
>> Hmm...
>
> Don't look closely! :P

Same physical person acting on behalf of two different legal
entities right? Seems OK to me.

Yours,
Linus Walleij