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Message-ID: <038e6569-9f8f-3b59-0243-af6dcf0c2d80@linaro.org>
Date:   Tue, 13 Dec 2022 17:27:45 +0100
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Subject: Re: [PATCH v2 03/13] arm64: dts: qcom: sdm845: Fix the base addresses
 of LLCC banks
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To:     Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        andersson@kernel.org, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, bp@alien8.de,
        tony.luck@intel.com
Cc:     quic_saipraka@quicinc.com, konrad.dybcio@linaro.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        james.morse@arm.com, mchehab@kernel.org, rric@kernel.org,
        linux-edac@vger.kernel.org, quic_ppareek@quicinc.com,
        luca.weiss@fairphone.com, stable@vger.kernel.org
References: <20221212123311.146261-1-manivannan.sadhasivam@linaro.org>
 <20221212123311.146261-4-manivannan.sadhasivam@linaro.org>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <20221212123311.146261-4-manivannan.sadhasivam@linaro.org>
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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.
> 
> Also, let's get rid of reg-names property as it is not needed anymore.
> The driver is expected to parse the reg field based on index to get the
> addresses of each LLCC banks.
> 
> Cc: <stable@vger.kernel.org> # 5.4

No, you cannot backport it. You will break users.

> Fixes: ba0411ddd133 ("arm64: dts: sdm845: Add device node for Last level cache controller")
> Reported-by: Parikshit Pareek <quic_ppareek@quicinc.com>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 65032b94b46d..683b861e060d 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -2132,8 +2132,9 @@ uart15: serial@a9c000 {
>  
>  		llcc: system-cache-controller@1100000 {
>  			compatible = "qcom,sdm845-llcc";
> -			reg = <0 0x01100000 0 0x31000>, <0 0x01300000 0 0x50000>;
> -			reg-names = "llcc_base", "llcc_broadcast_base";

Once property was made required, you cannot remove it. What if other
bindings user depends on it?

Please instead keep/update the reg-names and/or mark it as deprecated.
It must stay in DTS for some time.

Best regards,
Krzysztof