linux-kernel - Re: [PATCH 08/10] ARM: dts: NSP: Add a default compatible for switch node

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Date:   Wed, 11 Nov 2020 00:37:09 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM IPROC ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Rafał Miłecki <zajec5@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:BROADCOM IPROC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Kurt Kanzenbach <kurt@...-computers.de>
Subject: Re: [PATCH 08/10] ARM: dts: NSP: Add a default compatible for switch
 node

On Mon, Nov 09, 2020 at 07:31:11PM -0800, Florian Fainelli wrote:
> Provide a default compatible string which is based on the 58522 SRAB
> compatible, this allows us to have sane defaults and silences the
> following warnings:
>
>  arch/arm/boot/dts/bcm958522er.dt.yaml:
>     ethernet-switch@...00: compatible: 'oneOf' conditional failed,
> one
>     must be fixed:
>             ['brcm,bcm5301x-srab'] is too short
>             'brcm,bcm5325' was expected
>             'brcm,bcm53115' was expected
>             'brcm,bcm53125' was expected
>             'brcm,bcm53128' was expected
>             'brcm,bcm5365' was expected
>             'brcm,bcm5395' was expected
>             'brcm,bcm5389' was expected
>             'brcm,bcm5397' was expected
>             'brcm,bcm5398' was expected
>             'brcm,bcm11360-srab' was expected
>             'brcm,bcm5301x-srab' is not one of ['brcm,bcm53010-srab',
>     'brcm,bcm53011-srab', 'brcm,bcm53012-srab', 'brcm,bcm53018-srab',
>     'brcm,bcm53019-srab']
>             'brcm,bcm5301x-srab' is not one of ['brcm,bcm11404-srab',
>     'brcm,bcm11407-srab', 'brcm,bcm11409-srab', 'brcm,bcm58310-srab',
>     'brcm,bcm58311-srab', 'brcm,bcm58313-srab']
>             'brcm,bcm5301x-srab' is not one of ['brcm,bcm58522-srab',
>     'brcm,bcm58523-srab', 'brcm,bcm58525-srab', 'brcm,bcm58622-srab',
>     'brcm,bcm58623-srab', 'brcm,bcm58625-srab', 'brcm,bcm88312-srab']
>             'brcm,bcm5301x-srab' is not one of ['brcm,bcm3384-switch',
>     'brcm,bcm6328-switch', 'brcm,bcm6368-switch']
>             From schema:
>     Documentation/devicetree/bindings/net/dsa/b53.yaml
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  arch/arm/boot/dts/bcm-nsp.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/bcm-nsp.dtsi b/arch/arm/boot/dts/bcm-nsp.dtsi
> index 09fd7e55c069..8453865d1439 100644
> --- a/arch/arm/boot/dts/bcm-nsp.dtsi
> +++ b/arch/arm/boot/dts/bcm-nsp.dtsi
> @@ -386,7 +386,7 @@ ccbtimer1: timer@...00 {
>  		};
>
>  		srab: ethernet-switch@...00 {
> -			compatible = "brcm,nsp-srab";
> +			compatible = "brcm,bcm58522-srab", "brcm,nsp-srab";
>  			reg = <0x36000 0x1000>,
>  			      <0x3f308 0x8>,
>  			      <0x3f410 0xc>;
> --
> 2.25.1
>

I am not getting this.
The line:
#include "bcm-nsp.dtsi"

can be found in:

arch/arm/boot/dts/bcm988312hr.dts
arch/arm/boot/dts/bcm958625hr.dts
arch/arm/boot/dts/bcm958622hr.dts
arch/arm/boot/dts/bcm958625k.dts
arch/arm/boot/dts/bcm958522er.dts
arch/arm/boot/dts/bcm958525er.dts
arch/arm/boot/dts/bcm958623hr.dts
arch/arm/boot/dts/bcm958525xmc.dts


The pattern for the other DTS files that include this seems to be to
overwrite the compatible locally in bcm958522er.dts, like this:

&srab {
	compatible = "brcm,bcm58522-srab", "brcm,nsp-srab";
};

Is there a reason why you are choosing to put an SoC specific compatible
in the common bcm-nsp.dtsi?