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SubjectRe: [PATCH v4 6/6] arm64: dts: amazon: add Amazon's Annapurna Labs Alpine v3 support
Hello,

Sorry, I'm a bit late to the party...

On Tue, Feb 25, 2020 at 01:29:26PM +0200, Hanna Hawa wrote:
> diff --git a/arch/arm64/boot/dts/amazon/alpine-v3.dtsi b/arch/arm64/boot/dts/amazon/alpine-v3.dtsi
> + arch-timer {

Please use 'timer' instead.

> + compatible = "arm,armv8-timer";
> + interrupts = <GIC_PPI 0xd IRQ_TYPE_LEVEL_LOW>,
> + <GIC_PPI 0xe IRQ_TYPE_LEVEL_LOW>,
> + <GIC_PPI 0xb IRQ_TYPE_LEVEL_LOW>,
> + <GIC_PPI 0xa IRQ_TYPE_LEVEL_LOW>;
> + };

> + gic: interrupt-controller@f0000000 {
> + compatible = "arm,gic-v3";
> + #interrupt-cells = <3>;
> + #address-cells = <0>;

No need for this.

> + interrupt-controller;
> + reg = <0x0 0xf0800000 0 0x10000>,
> + <0x0 0xf0a00000 0 0x200000>,
> + <0x0 0xf0000000 0 0x2000>,
> + <0x0 0xf0010000 0 0x1000>,
> + <0x0 0xf0020000 0 0x2000>;

Please add comments here, see alpine-v2.dtsi (or other dtsi in
arch/arm64).

> + interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> + };
> +
> + msix: msix@fbe00000 {
> + compatible = "al,alpine-msix";
> + reg = <0x0 0xfbe00000 0x0 0x100000>;
> + interrupt-controller;
> + msi-controller;
> + al,msi-base-spi = <160>;
> + al,msi-num-spis = <800>;
> + interrupt-parent = <&gic>;
> + };
> +
> + uart0: serial@fd883000 {

Looking at the Alpine v2 dtsi, this node was put in an io-fabric bus. It
seems to me the Alpine v3 dtsi is very similar. Would it apply as well?

> + compatible = "ns16550a";
> + reg = <0x0 0xfd883000 0x0 0x1000>;
> + clock-frequency = <0>;

Is the frequency set to 0 on purpose? Or is it set by a firmware at boot
time (if so please add a comment)?

> + interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
> + reg-shift = <2>;
> + reg-io-width = <4>;

Since you're enabling this node explicitly in the dts, you can set it to
disabled by default.

> + };
> +
> + pcie@fbd00000 {

Please order the nodes in increasing order.

> + compatible = "pci-host-ecam-generic";
> + device_type = "pci";
> + #size-cells = <2>;
> + #address-cells = <3>;
> + #interrupt-cells = <1>;
> + reg = <0x0 0xfbd00000 0x0 0x100000>;
> + interrupt-map-mask = <0xf800 0 0 7>;
> + /* 8 x legacy interrupts for SATA only */
> + interrupt-map = <0x4000 0 0 1 &gic 0 57 IRQ_TYPE_LEVEL_HIGH>,
> + <0x4800 0 0 1 &gic 0 58 IRQ_TYPE_LEVEL_HIGH>,
> + <0x5000 0 0 1 &gic 0 59 IRQ_TYPE_LEVEL_HIGH>,
> + <0x5800 0 0 1 &gic 0 60 IRQ_TYPE_LEVEL_HIGH>,
> + <0x6000 0 0 1 &gic 0 61 IRQ_TYPE_LEVEL_HIGH>,
> + <0x6800 0 0 1 &gic 0 62 IRQ_TYPE_LEVEL_HIGH>,
> + <0x7000 0 0 1 &gic 0 63 IRQ_TYPE_LEVEL_HIGH>,
> + <0x7800 0 0 1 &gic 0 64 IRQ_TYPE_LEVEL_HIGH>;
> + ranges = <0x02000000 0x0 0xfe000000 0x0 0xfe000000 0x0 0x1000000>;
> + bus-range = <0x00 0x00>;
> + msi-parent = <&msix>;
> + };
> + };
> +};

The rest of the series looks good.

Thanks!
Antoine

--
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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