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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 2022-09-27 at 13:01 +0200, AngeloGioacchino Del Regno wrote: > Il 27/09/22 04:55, Tinghan Shen ha scritto: > > Add the 2nd core(core 1) of MT8195 dual-core SCP to devicetree file. > > Reserve some SRAM spaces for the core 1 image. > > > > Signed-off-by: Tinghan Shen > > --- > > arch/arm64/boot/dts/mediatek/mt8195.dtsi | 14 +++++++++++++- > > 1 file changed, 13 insertions(+), 1 deletion(-) > > > > diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi > > index 905d1a90b406..48d457bd39b8 100644 > > --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi > > +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi > > @@ -760,12 +760,24 @@ > > > > scp: scp@10500000 { > > compatible = "mediatek,mt8195-scp"; > > - reg = <0 0x10500000 0 0x100000>, > > + reg = <0 0x10500000 0 0xa0000>, > > <0 0x10720000 0 0xe0000>, > > <0 0x10700000 0 0x8000>; > > reg-names = "sram", "cfg", "l1tcm"; > > interrupts = ; > > status = "disabled"; > > + > > + #address-cells = <1>; > > + #size-cells = <1>; > > + ranges = <0x105a0000 0 0x105a0000 0x20000>; > > + > > + scp_c1: scp-c1@105a0000 { > > + compatible = "mediatek,mt8195-scp-core"; > > + reg = <0x105a0000 0x20000>; > > + reg-names = "sram"; > > + interrupts = ; > > + status = "disabled"; > > + }; > > I think that the best way of describing a dual-core SCP in devicetree would > be either something like: > > scp: scp@10500000 { > compatible = "mediatek,mt8195-scp"; > reg = <0 0x10500000 0 0xa0000>, <0 0x105a0000 0 0x20000>, > <0 0x10720000 0 0xe0000>, <0 0x10700000 0 0x8000>; > reg-names = "sram", "sram-c1", "cfg", "l1tcm"; > interrupts = , > ; > status = "disabled"; > }; > > ...but that may pose an issue when trying to assign different (or more instances > of the same) subnode(s) to each core... for which, I'd be more for something like: > > scp: scp@10500000 { > compatible = "mediatek,mt8195-scp"; > reg = <0 0x10720000 0 0xe0000>, <0 0x10700000 0 0x8000>; > reg-names = "cfg", "l1tcm"; > #address-cells = <1>; > #size-cells = <1>; > ranges = <0 0 0x10500000 0x100000>; > status = "disabled"; > > scp_c0: scp-core@0 { > compatible = "mediatek,mt8195-scp-core"; > reg = <0x0 0xa0000>; > reg-names = "sram"; > interrupts = ; > }; > > scp_c1: scp-core@a0000 { > compatible = "mediatek,mt8195-scp-core"; > reg = <0xa0000 0x20000>; > reg-names = "sram"; > interrupts = ; > }; > }; > > Regards, > Angelo > > Hi Angelo, I'm thinking about identifying the cores by the order of the sub nodes, i.e. core 0 must be the first sub node and core 1 must be the second sub node, because the scp cores in the example have the same compatible name. I'm hesitant to make the sub nodes appear in a certain order. Is it appropriate? Or, would it be more readable to create a new core id property? Or utilizing different compatble strings for cores? I would appreciat it if you could share your opinion. -- Best regards, TingHan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel