linux-kernel - Re: [PATCH v2 06/12] arm64: dts: qcom: msm8994: Add SCM node

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Message-ID: <20200624072927.GT128451@builder.lan>
Date:   Wed, 24 Jun 2020 00:29:27 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Konrad Dybcio <konradybcio@...il.com>
Cc:     skrzynka@...radybcio.pl, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/12] arm64: dts: qcom: msm8994: Add SCM node

On Tue 23 Jun 16:30 PDT 2020, Konrad Dybcio wrote:

> >Shouldn't this be "qcom,scm-msm8992", "qcom,scm" ?
> >
> >(Or rather "qcom,scm-msm8994", "qcom,scm")
> 
> Some DTs only have the SoC-specific one, and some also
> have the generic one. But I can add the generic one if
> you wish.
> 
> I went with 8992, as I added it in the 8992 series
> (gonna update that one soon, too, so we can get it merged)
> and I didn't want to needlessly duplicate it. Ideally maybe we
> could switch to just qcom,scm for clockless SCM compats?
> 

It's fairly common practice to specify both a specific and a generic
compatible, this would allow us to in the driver do special handling of
the specific in the future if we need to - without having to update the
devicetree.

Regards,
Bjorn