linux-kernel - Re: [PATCH v3 3/3] arm64: dts: qcom: Specify dload address for msm8916 and msm8996

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Date:   Mon, 14 Aug 2017 14:58:59 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org
Subject: Re: [PATCH v3 3/3] arm64: dts: qcom: Specify dload address for
 msm8916 and msm8996

On Wed 09 Aug 14:50 PDT 2017, Stephen Boyd wrote:

> On 08/09/2017 01:10 PM, Bjorn Andersson wrote:
> > On msm8916 and msm8996 boards a secure io-write is used to write the
> > magic for selecting "download mode", specify this address in the
> > DeviceTree.
> >
> > Note that qcom_scm.download_mode=1 must be specified on the kernel
> > command line for the kernel to attempt selecting download mode.
> >
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/msm8916.dtsi | 2 ++
> >  arch/arm64/boot/dts/qcom/msm8996.dtsi | 7 +++++++
> >  2 files changed, 9 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
> > index 039991f80831..b7197f2e7209 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8916.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
> > @@ -241,6 +241,8 @@
> >  			clocks = <&gcc GCC_CRYPTO_CLK>, <&gcc GCC_CRYPTO_AXI_CLK>, <&gcc GCC_CRYPTO_AHB_CLK>;
> >  			clock-names = "core", "bus", "iface";
> >  			#reset-cells = <1>;
> > +
> > +			qcom,dload-mode = <&tcsr>;
> >  		};
> >  	};
> >  
> > diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> > index 8f085716e258..2eee6a33f22b 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> > @@ -261,6 +261,8 @@
> >  	firmware {
> >  		scm {
> >  			compatible = "qcom,scm-msm8996";
> > +
> > +			qcom,dload-mode = <&tcsr>;
> 
> We don't need an offset into tcsr?
> 

Of course we do, this only worked with my previous (and incorrect) tcsr
definition - not the one I ended up including in the patch.

Thanks,
Bjorn