linux-kernel - Re: [RESEND PATCH 5/9] arm64: dts: Add BCM4908 generic board dts

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Message-ID: <6e3bfcb2-41e8-5e67-6e17-8dc1a0dd0c07@broadcom.com>
Date:   Thu, 21 Jul 2022 11:29:37 -0700
From:   William Zhang <william.zhang@...adcom.com>
To:     Rafał Miłecki <rafal@...ecki.pl>
Cc:     Linux ARM List <linux-arm-kernel@...ts.infradead.org>,
        joel.peshkin@...adcom.com, dan.beygelman@...adcom.com,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Anand Gore <anand.gore@...adcom.com>,
        Kursad Oney <kursad.oney@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH 5/9] arm64: dts: Add BCM4908 generic board dts



On 07/20/2022 11:45 PM, Rafał Miłecki wrote:
> On 2022-07-21 02:07, William Zhang wrote:
>> Add generic bcm94908.dts file.
>>
>> Signed-off-by: William Zhang <william.zhang@...adcom.com>
>> ---
>>
>>  arch/arm64/boot/dts/broadcom/bcmbca/Makefile  |  1 +
>>  .../boot/dts/broadcom/bcmbca/bcm94908.dts     | 30 +++++++++++++++++++
>>  2 files changed, 31 insertions(+)
>>  create mode 100644 arch/arm64/boot/dts/broadcom/bcmbca/bcm94908.dts
>>
>> diff --git a/arch/arm64/boot/dts/broadcom/bcmbca/Makefile
>> b/arch/arm64/boot/dts/broadcom/bcmbca/Makefile
>> index d30fa75f0611..27741b71ba9e 100644
>> --- a/arch/arm64/boot/dts/broadcom/bcmbca/Makefile
>> +++ b/arch/arm64/boot/dts/broadcom/bcmbca/Makefile
>> @@ -4,6 +4,7 @@ dtb-$(CONFIG_ARCH_BCMBCA) += \
>>                  bcm4906-tplink-archer-c2300-v1.dtb \
>>                  bcm4908-asus-gt-ac5300.dtb \
>>                  bcm4908-netgear-raxe500.dtb \
>> +                bcm94908.dtb \
>>                  bcm4912-asus-gt-ax6000.dtb \
>>                  bcm94912.dtb \
>>                  bcm963158.dtb \
> 
> AFAIU bcm94908 is a reference board name. I think I see some
> inconsistency in naming Broadcom's reference boards DTS files.
> 
> If you take a look at in-kernel DTS files:
> find ./arch/arm*/boot/dts/ -name "*.dts"
> 99% of them are prefixed with family/SoC name. I did the same for
> bcm4908 (and Northstar) boards. So it's
> <soc>-<manufacturer>-<model>.dts
> e.g.
> bcm4908-asus-gt-ac5300.dts
> 
> To match that I *think* you should actually call your file:
> bcm4908-bcm94908 (or bcm4908-94908 depending on actual board name)
> 
> First of all: am I correct here?
> 
I do see many dts named in the format you described here and I agree it 
is very clear.  But at Broadcom we use a slight different format for 
reference boards that we started from day 1: bcm9<soc>-<ref board 
model>.dts such as bcm963138REF.dts. And there are many in the kernel as 
well if you search "bcm9*.dts".  Many of them are Broadcom reference 
boards and some are actual consumer product.

> Secondly: could you do that? I know many DTS files named ignoring SoC/
> family prefix. Still maybe we could change it as some (this) point?
I actually was thinking to ask you if we can change all the 4908 boards 
to use bcm94908- prefix to be consistent with Broadcom board name 
convention. But at the second thought, I didn't ask because it does not 
make much benefit other than a uniform name, unless you agree and I can 
make that change. Otherwise, I would rather keep them as they are now 
because we have ton of reference boards here and we don't want to make 
that changes to remove the 9 (which will definitive cause big confusing 
internally) and there are no rule in linux for the name as far as I 
know.   What I can do is update the bcmbca.yaml to put bcmbca board name 
rule bcm9<soc>-<ref board model>.dts  for broadcom reference board and 
bcm<soc>-<manufacturer>-<model>.dts for customer board,  if that sounds 
good to you.

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