linux-kernel - Re: [RESEND PATCH 2/2] arm64: dts: rockchip: add Coresight debug range for RK3399

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Date:   Wed, 8 Sep 2021 13:12:09 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rockchip@...ts.infradead.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RESEND PATCH 2/2] arm64: dts: rockchip: add Coresight debug
 range for RK3399

On Wed, Sep 8, 2021 at 12:46 AM Brian Norris <briannorris@...omium.org> wrote:
>
> Per Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt.
>
> This IP block can be used for sampling the PC of any given CPU, which is
> useful in certain panic scenarios where you can't get the CPU to stop
> cleanly (e.g., hard lockup).
>
> Signed-off-by: Brian Norris <briannorris@...omium.org>

The datasheet isn't clear on whether the debug subsystem has a separate
power domain or not, so that may bug us later. Otherwise,

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>