linux-kernel - Re: [PATCH 2/2] clk: qcom: Support 'protected-clocks' property

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Message-ID: <154279082358.88331.12065362627893713159@swboyd.mtv.corp.google.com>
Date:   Wed, 21 Nov 2018 01:00:23 -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,
        Taniya Das <tdas@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH 2/2] clk: qcom: Support 'protected-clocks' property

Quoting Stephen Boyd (2018-11-05 11:40:11)
> Certain firmware configurations "protect" clks and cause the entire
> system to reboot when a non-secure OS such as Linux tries to read or
> write protected clk registers. But other firmware configurations allow
> reading or writing the same registers, and they may actually require
> that the OS use the otherwise locked down clks. Support the
> 'protected-clocks' property by never registering these protected clks
> with the common clk framework. This way, when firmware is protecting
> these clks we won't have the chance to ever read or write these
> registers and take down the entire system.
> 
> Cc: Taniya Das <tdas@...eaurora.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---

Applied to clk-next