linux-kernel - Re: [PATCH 1/2] dt-bindings: clk: Introduce 'protected-clocks' property

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Message-ID: <154279081676.88331.1516496381312386439@swboyd.mtv.corp.google.com>
Date:   Wed, 21 Nov 2018 01:00:16 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Taniya Das <tdas@...eaurora.org>
Subject: Re: [PATCH 1/2] dt-bindings: clk: Introduce 'protected-clocks' property

Quoting Stephen Boyd (2018-11-05 11:40:10)
> Add a generic clk property for clks which are not intended to be used by
> the OS due to security restrictions put in place by firmware. For
> example, on some Qualcomm firmwares reading or writing certain clk
> registers causes the entire system to reboot, but on other firmwares
> reading and writing those same registers is required to make devices
> like QSPI work. Rather than adding one-off properties each time a new
> set of clks appears to be protected, let's add a generic clk property to
> describe any set of clks that shouldn't be touched by the OS. This way
> we never need to register the clks or use them in certain firmware
> configurations.
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Taniya Das <tdas@...eaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---

Applied to clk-next