Re: [PATCH] arm64: dts: renesas: r8a779h0: Add GICv3 ITS and update PCIe node

[Marek Vasut <marek.vasut@mailbox.org>]

On 9/8/26 10:46 AM, Geert Uytterhoeven wrote:

Hello Geert,

> As I am not PCIe DT expert, I am comparing this to the corresponding
> patch for R-Car V4H, which I have already queued as commit
> 7fe73a3a3f2c3718 ("arm64: dts: renesas: r8a779g0: Add GICv3 ITS and
> update PCIe nodes") in renesas-devel, but which probably needs some
> updates.

I sent a fix for that one:

[PATCH] arm64: dts: renesas: r8a779g0: Add MSI cells to GICv3 ITS

>> --- a/arch/arm64/boot/dts/renesas/r8a779h0.dtsi
>> +++ b/arch/arm64/boot/dts/renesas/r8a779h0.dtsi
>> @@ -691,6 +691,8 @@ pciec0: pcie@e65d0000 {
>>                          resets = <&cpg 624>, <&cpg 1121>;
>>                          reset-names = "pwr", "core";
>>                          max-link-speed = <4>;
>> +                       msi-parent = <&its 0>;
> 
> This has an extra cell "0", which is probably correct, given
> "#msi-cells = <1>" below.
> 
>> +                       msi-map = <0x0 &its 0x0 0x10000>;
> 
> This is not present on R-Car V4H (which is probably wrong).
> 
> Interestingly, Documentation/devicetree/bindings/pci/pci-ep.yaml
> documents msi-map for endpoint node, so should it be added to the
> pcie-ep node, too?
I do not think we should be adding it until we can test ITS with EP ?
This patch adds the ITS only to the RC side, where I can test it.