linux-kernel - Re: [PATCH v2 1/1] arm64: dts: cn913x: add device trees for COM Express boards

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Date:   Wed, 25 Oct 2023 09:33:54 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Elad Nachman <enachman@...vell.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        andrew@...n.ch, gregory.clement@...tlin.com,
        sebastian.hesselbarth@...il.com, pali@...nel.org,
        mrkiko.rs@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/1] arm64: dts: cn913x: add device trees for COM
 Express boards

On 25/10/2023 09:31, Elad Nachman wrote:
> From: Elad Nachman <enachman@...vell.com>
> 
> Add support for CN9130 and CN9131 COM Express Type 7 CPU
> module boards (SOM boards) by Marvell.
> Define these COM Express CPU modules / SOMs as dtsi, and
> provide a dts file for a carrier board (Marvell AC5X RD
> COM Express type 7 carrier board).
> This Carrier board only utilizes the PCIe link, hence no
> special device / driver support is provided by this dts file.
> 
> These boards differ from the existing CN913x DB boards by the type
> of ethernet connection (RGMII), the type of voltage regulators
> (not i2c expander based) and the USB phy (not UTMI based).
> CN9131 COM Express board is basically CN9130 COM Express board
> with an additional CP115 I/O co-processor, which in this case
> provides an additional USB host controller on the board.
> 
> Signed-off-by: Elad Nachman <enachman@...vell.com>
> ---
>  arch/arm64/boot/dts/marvell/Makefile          |   1 +
>  .../boot/dts/marvell/ac5x_rd_carrier.dts      |  23 ++++
>  .../dts/marvell/cn9130-db-comexpress.dtsi     | 101 ++++++++++++++++
>  .../dts/marvell/cn9131-db-comexpress.dtsi     | 113 ++++++++++++++++++
>  4 files changed, 238 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/marvell/ac5x_rd_carrier.dts
>  create mode 100644 arch/arm64/boot/dts/marvell/cn9130-db-comexpress.dtsi
>  create mode 100644 arch/arm64/boot/dts/marvell/cn9131-db-comexpress.dtsi
> 
> diff --git a/arch/arm64/boot/dts/marvell/Makefile b/arch/arm64/boot/dts/marvell/Makefile
> index 79ac09b58a89..b0a2347200ef 100644
> --- a/arch/arm64/boot/dts/marvell/Makefile
> +++ b/arch/arm64/boot/dts/marvell/Makefile
> @@ -26,4 +26,5 @@ dtb-$(CONFIG_ARCH_MVEBU) += cn9132-db.dtb
>  dtb-$(CONFIG_ARCH_MVEBU) += cn9132-db-B.dtb
>  dtb-$(CONFIG_ARCH_MVEBU) += cn9130-crb-A.dtb
>  dtb-$(CONFIG_ARCH_MVEBU) += cn9130-crb-B.dtb
> +dtb-$(CONFIG_ARCH_MVEBU) += ac5x_rd_carrier.dtb
>  dtb-$(CONFIG_ARCH_MVEBU) += ac5-98dx35xx-rd.dtb
> diff --git a/arch/arm64/boot/dts/marvell/ac5x_rd_carrier.dts b/arch/arm64/boot/dts/marvell/ac5x_rd_carrier.dts
> new file mode 100644
> index 000000000000..4b2cf417332f
> --- /dev/null
> +++ b/arch/arm64/boot/dts/marvell/ac5x_rd_carrier.dts
> @@ -0,0 +1,23 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (C) 2023 Marvell International Ltd.
> + *
> + * Device tree for the AC5X RD Type 7 Com Express carrier board,
> + * Utilizing the CN913x COM Express SOM board.
> + * This specific board only maintains a PCIe link with the CPU SOM
> + * module, which does not require any special DTS definitions.
> + */
> +
> +#include "cn9131-db-comexpress.dtsi"
> +
> +/ {
> +	model = "Marvell Armada AC5X RD COM EXPRESS type 7 carrier board";
> +	compatible = "marvell,cn9131", "marvell,cn9130",
> +		     "marvell,armada-ap807-quad", "marvell,armada-ap807";

Please run scripts/checkpatch.pl and fix reported warnings. Some
warnings can be ignored, but the code here looks like it needs a fix.
Feel free to get in touch if the warning is not clear.

I asked to document this in the bindings.

Also, compatibles do not look right. You called the board AC5X RD but
compatible is CN9131.

Best regards,
Krzysztof