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

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Message-ID: <ff118521-6317-b75f-243d-bcd6bbe255d5@gmail.com>
Date:   Tue, 10 Nov 2020 14:40:43 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...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 11/10/20 2:37 PM, Vladimir Oltean wrote:
> 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?

It is necessary to silence the warnings provided in the commit message
even when the srab node is disabled, since the dt_binding_check rule
will check all of the nodes matching the pattern. If there is a better
way to do this, I would gladly do it differently.
-- 
Florian