linux-kernel - Re: [PATCH v3 1/3] arm64: dts: cn913x: add device trees for COM Express boards

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Date:   Thu, 26 Oct 2023 19:32:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Elad Nachman <enachman@...vell.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, 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,
        cyuval@...vell.com
Subject: Re: [PATCH v3 1/3] arm64: dts: cn913x: add device trees for COM
 Express boards

> +#include "cn9131-db-comexpress.dtsi"
> +
> +/ {
> +	model = "Marvell Armada AC5X RD COM EXPRESS type 7 carrier board";
> +	compatible = "marvell,ac5x_rd_carrier", "marvell,cn9131", "marvell,cn9130",
> +		     "marvell,armada-ap807-quad", "marvell,armada-ap807";

This is really a question to the DT Maintainers. This is a carrier
board for a standardised Com express type 7 board. In theory, you
should be able to plug any Com Express module into it, not just
Marvells. So should the compatible list just have a compatible for the
carrier itself? Not the module which would normally be mounted in it?

Should the carrier have a .dtsi file describing it? And then we have a
.dts file which combines the module .dtsi and the carrier .dtsi?

Sorry i did not ask this earlier, i was thinking more about SolidRuns
systems, which tend to have custom SOMs and customs carriers, so you
can only really mount one particular SOM into one particular
carrier. But that is not true here.

	 Andrew