diff mbox series

[v3,03/11] arm64: dts: mt8195: Add SCP core 1 node

Message ID 20220927025606.26673-4-tinghan.shen@mediatek.com (mailing list archive)
State New, archived
Headers show
Series Add support for MT8195 SCP 2nd core | expand

Commit Message

Tinghan Shen Sept. 27, 2022, 2:55 a.m. UTC 
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 <tinghan.shen@mediatek.com>
---
 arch/arm64/boot/dts/mediatek/mt8195.dtsi | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Comments

AngeloGioacchino Del Regno Sept. 27, 2022, 11:01 a.m. UTC | #1 
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 <tinghan.shen@mediatek.com>
> ---
>   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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
>   			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 = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
> +				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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>,
		     <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
	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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
	};

	scp_c1: scp-core@a0000 {
		compatible = "mediatek,mt8195-scp-core";
		reg = <0xa0000 0x20000>;
		reg-names = "sram";
		interrupts = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
	};
};

Regards,
Angelo
Tinghan Shen Jan. 17, 2023, 8:19 a.m. UTC | #2 
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 <tinghan.shen@mediatek.com>
> > ---
> >   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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
> >   			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 = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
> > +				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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>,
> 		     <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
> 	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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
> 	};
> 
> 	scp_c1: scp-core@a0000 {
> 		compatible = "mediatek,mt8195-scp-core";
> 		reg = <0xa0000 0x20000>;
> 		reg-names = "sram";
> 		interrupts = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
> 	};
> };
> 
> 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.
AngeloGioacchino Del Regno Jan. 17, 2023, 8:55 a.m. UTC | #3 
Il 17/01/23 09:19, TingHan Shen (沈廷翰) ha scritto:
> 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 <tinghan.shen@mediatek.com>
>>> ---
>>>    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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
>>>    			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 = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
>>> +				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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>,
>> 		     <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
>> 	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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
>> 	};
>>
>> 	scp_c1: scp-core@a0000 {
>> 		compatible = "mediatek,mt8195-scp-core";
>> 		reg = <0xa0000 0x20000>;
>> 		reg-names = "sram";
>> 		interrupts = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
>> 	};
>> };
>>
>> 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.
> 
> 

Assuming that in a future >2 cores architecture only the first core, which I will
call "core 0" for commodity, will have "special treatment" and core 1, 2, 3...N
will always be "interchangeable", I think that something like `mediatek,scp-leader`
would work to identify the first core.

Cheers!
Angelo
diff mbox series

Patch

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 = <GIC_SPI 462 IRQ_TYPE_LEVEL_HIGH 0>;
 			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 = <GIC_SPI 463 IRQ_TYPE_LEVEL_HIGH 0>;
+				status = "disabled";
+			};
 		};
 
 		scp_adsp: clock-controller@10720000 {