linux-kernel - Re: [PATCH v2 04/13] arm64: dts: qcom: sc7180: Remove reg-names property from LLCC node

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Date:   Tue, 13 Dec 2022 17:30:09 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bp@...en8.de,
        tony.luck@...el.com
Cc:     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 04/13] arm64: dts: qcom: sc7180: Remove reg-names
 property from LLCC node

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 SC7180, 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> # 5.6

Oh, no, there is no single bug here. Binding from v5.6+ (which cannot be
changed) required/defined such reg-names. This is neither a bug nor
possible to backport.

> Fixes: c831fa299996 ("arm64: dts: qcom: sc7180: Add Last level cache controller node")

Drop.

> Reported-by: Parikshit Pareek <quic_ppareek@...cinc.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index f71cf21a8dd8..b0d524bbf051 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -2759,7 +2759,6 @@ dc_noc: interconnect@...0000 {
>  		system-cache-controller@...0000 {
>  			compatible = "qcom,sc7180-llcc";
>  			reg = <0 0x09200000 0 0x50000>, <0 0x09600000 0 0x50000>;
> -			reg-names = "llcc_base", "llcc_broadcast_base";

That's an ABI break...

>  			interrupts = <GIC_SPI 582 IRQ_TYPE_LEVEL_HIGH>;
>  		};
>  

Best regards,
Krzysztof