linux-kernel - Re: [PATCH v2 11/13] arm64: dts: qcom: sm6350: Remove reg-names property from LLCC node

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Message-ID: <20221213171754.GF4862@thinkpad>
Date:   Tue, 13 Dec 2022 22:47:54 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bp@...en8.de,
        tony.luck@...el.com, quic_saipraka@...cinc.com,
        konrad.dybcio@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, james.morse@....com,
        mchehab@...nel.org, rric@...nel.org, linux-edac@...r.kernel.org,
        quic_ppareek@...cinc.com, luca.weiss@...rphone.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 11/13] arm64: dts: qcom: sm6350: Remove reg-names
 property from LLCC node

On Tue, Dec 13, 2022 at 05:31:40PM +0100, Krzysztof Kozlowski wrote:
> On 12/12/2022 13:33, Manivannan Sadhasivam wrote:
> > The LLCC block has several banks each with a different base address
> > and holes in between. So it is not a correct approach to cover these
> > banks with a single offset/size. Instead, the individual bank's base
> > address needs to be specified in devicetree with the exact size.
> > 
> > On SM6350, there is only one LLCC bank available. So only change needed is
> > to remove the reg-names property from LLCC node to conform to the binding.
> > 
> > The driver is expected to parse the reg field based on index to get the
> > addresses of each LLCC banks.
> > 
> > Cc: <stable@...r.kernel.org> # 5.16
> > Fixes: ced2f0d75e13 ("arm64: dts: qcom: sm6350: Add LLCC node")
> 
> This is a definitive no go. There is no bug here and such change cannot
> be backported.
> 
> > Reported-by: Parikshit Pareek <quic_ppareek@...cinc.com>
> 
> What is the bug here which deserves a credit? reg-names in v5.16 were
> perfectly correct.
> 

If the driver gets backported to v5.16, it won't. But anyway, this property
will stay in dts.

Thanks,
Mani

> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sm6350.dtsi | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi b/arch/arm64/boot/dts/qcom/sm6350.dtsi
> > index 43324bf291c3..1f39627cd7c6 100644
> > --- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
> > @@ -1174,7 +1174,6 @@ dc_noc: interconnect@...0000 {
> >  		system-cache-controller@...0000 {
> >  			compatible = "qcom,sm6350-llcc";
> >  			reg = <0 0x09200000 0 0x50000>, <0 0x09600000 0 0x50000>;
> > -			reg-names = "llcc_base", "llcc_broadcast_base";
> >  		};
> >  
> >  		gem_noc: interconnect@...0000 {
> 
> Best regards,
> Krzysztof
> 

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