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

[Krzysztof Kozlowski]

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@xxxxxxxxxxxxxxx> # 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@xxxxxxxxxxx>

What is the bug here which deserves a credit? reg-names in v5.16 were
perfectly correct.

> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> ---
>  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@9160000 {
>  		system-cache-controller@9200000 {
>  			compatible = "qcom,sm6350-llcc";
>  			reg = <0 0x09200000 0 0x50000>, <0 0x09600000 0 0x50000>;
> -			reg-names = "llcc_base", "llcc_broadcast_base";
>  		};
>  
>  		gem_noc: interconnect@9680000 {

Best regards,
Krzysztof