linux-kernel - Re: [PATCH 2/2] clk: qcom: restrict drivers per ARM/ARM64

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Date:   Mon, 30 Jan 2023 15:30:15 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] clk: qcom: restrict drivers per ARM/ARM64

Quoting Krzysztof Kozlowski (2023-01-26 01:31:55)
> On 25/01/2023 21:44, Stephen Boyd wrote:
> > Quoting Krzysztof Kozlowski (2023-01-23 01:49:25)
> >> There is no point to allow selecting pin-controller drivers for Qualcomm
> > 
> > pin controllers?
> 
> Copy-paste, I'll fix it.
> 
> > 
> >> ARMv7 SoCs when building ARM64 kernel, and vice versa.  This makes
> >> kernel configuration more difficult as many do not remember the Qualcomm
> >> SoCs model names/numbers.  There won't be a single image for ARMv7 and
> >> ARMv8/9 SoCs, so no features/options are lost.
> > 
> > Are the drivers used in arm32 emulation mode on these SoCs? I recall
> > there are some SoCs they run with the arm architecture.
> 
> I did not add it to the few SoCs which have upstream DTS in ARM and
> ARM64. I added only to the ones which are in one specific folder. Also
> my patch does not affect defconfigs (qcom_defconfig and arm64/defconfig).

Cool, thanks for checking. Is it possible to take a dtb from arm64 dts
directory and boot it on an armv8 CPU running in 32-bit mode? Just
wondering if even having the dts file exist in the arm64 architecture
really matters here.

> 
> Whether downstream could be affected, I do not know. Anyway, what's
> downstream it's the downstream's problem...
> 

Agreed. I wasn't asking about downstream.