linux-kernel - Re: [PATCH 4/4] arm64: dts: uniphier: Add NX1 SoC and boards support

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Date:   Thu, 27 Oct 2022 20:19:34 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Arnd Bergmann <arnd@...db.de>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Olof Johansson <olof@...om.net>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     soc@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: uniphier: Add NX1 SoC and boards support

Hi Arnd,

Thank you for your comment.

On 2022/10/27 19:01, Arnd Bergmann wrote:
> On Thu, Oct 27, 2022, at 06:51, Kunihiko Hayashi wrote:
>> Initial version of devicetree sources for NX1 SoC and boards.
>>
>> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> 
> Can you add more information here? When new SoCs get added, I
> usually provide more than this in my own pull requests sending
> the patches to Linus, so please add some background here, such as:
> 
> - is this a new SoC, or or something that has been around for a while
>    and only now gets upstreamed?
> 
> - What is the target market for this SoC? Are there any products
>    one can buy with it?
> 
> - What type of CPU cores does it use, or any other noteworthy
>    IP blocks that are relevant for its purpose?

This advice is good for me.
I'll add some background for this SoC to the commit.

>> +			usb_hsphy0: hs-phy@200 {
>> +				compatible =
> "socionext,uniphier-nx1-usb3-hsphy";
>> +				reg = <0x200 0x10>;
> 
>> +			usb_ssphy0: ss-phy@300 {
>> +				compatible =
> "socionext,uniphier-nx1-usb3-ssphy";
>> +				reg = <0x300 0x10>;
> 
> I think these are usually just named 'phy@' instead of 'hs-phy@'

I see. Since it was adapted to other SoCs, I'll rename the node as well
in another patch.

>> +			ranges =
>> +			/* downstream I/O */
>> +				<0x81000000 0 0x00000000 0x0ffe0000 0
> 0x00010000>,
>> +			/* non-prefetchable memory */
>> +				<0x82000000 0 0x20000000 0x04200000 0
> 0x0bde0000>;
> 
> 200MB of memory space is rather small, is there no 64-bit range?

Unfortunately, this SoC has only 190MB of PCIe memory space.

>> +			#interrupt-cells = <1>;
>> +			interrupt-names = "dma", "msi";
>> +			interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-map-mask = <0 0 0 7>;
>> +			interrupt-map = <0 0 0 1 &pcie_intc 0>,	/* INTA */
>> +					<0 0 0 2 &pcie_intc 1>,	/* INTB */
>> +					<0 0 0 3 &pcie_intc 2>,	/* INTC */
>> +					<0 0 0 4 &pcie_intc 3>;	/* INTD */
>> +			phy-names = "pcie-phy";
>> +			phys = <&pcie_phy>;
>> +
>> +			pcie_intc: legacy-interrupt-controller {
>> +				interrupt-controller;
>> +				#interrupt-cells = <1>;
>> +				interrupt-parent = <&gic>;
>> +				interrupts = <GIC_SPI 86
> IRQ_TYPE_LEVEL_HIGH>;
>> +			};
>> +		};
> 
> Shouldn't there be an "msi-map" or "msi-parent" property pointing at
> the GIC?

Since Designware PCIe receives an interrupt from GIC with interrupt-name "msi"
and passes the interrupt to the linear irq domain corresponding to MSI,
I think there is neither "msi-map" nor "msi-parent" properties.

Thank you,

---
Best Regards
Kunihiko Hayashi