linux-kernel - Re: [RFC PATCH 2/9] dt-bindings: arm: amlogic: add X96-AIR bindings

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Date:   Wed, 8 Dec 2021 08:44:40 +0400
From:   Christian Hewitt <christianshewitt@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Benoit Masson <yahoo@...enite.com>
Subject: Re: [RFC PATCH 2/9] dt-bindings: arm: amlogic: add X96-AIR bindings


> On 8 Dec 2021, at 1:21 am, Rob Herring <robh@...nel.org> wrote:
> 
> On Tue, Nov 30, 2021 at 06:05:16AM +0000, Christian Hewitt wrote:
>> Add board bindings for the Amediatech X96-AIR STB which ships with
>> model variants distiguished by Ethernet configuration: models using
>> internal 10/100 PHY have a -100 suffix, while models using external
>> Gigabit PHY have a -1000 suffix.
> 
> Isn't the phy described in DT? Why do you need to describe this 1 
> difference at the top level?

Users who purchase Android STBs as a cheap Linux media device (or are
reimiaging an existing device when they give up on Android) generally
have no idea what a PHY is, so reading a device-tree file to pick the
correct one is beyond them. Most people blindly try all dtb files for
a class of device until they find one that works, so top-level naming
is simply to hint the process and reduce guesswork. It’s not perfect,
but it does appear to reduce the quantity of “Ethernet doesn’t work!”
posts seen in support forums.

Christian

>> Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
>> ---
>> Documentation/devicetree/bindings/arm/amlogic.yaml | 2 ++
>> 1 file changed, 2 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/arm/amlogic.yaml b/Documentation/devicetree/bindings/arm/amlogic.yaml
>> index 36081734f720..e9ab0ffe8be7 100644
>> --- a/Documentation/devicetree/bindings/arm/amlogic.yaml
>> +++ b/Documentation/devicetree/bindings/arm/amlogic.yaml
>> @@ -170,6 +170,8 @@ properties:
>>       - description: Boards with the Amlogic Meson SM1 S905X3/D3/Y3 SoC
>>         items:
>>           - enum:
>> +              - amediatech,x96-air-100
>> +              - amediatech,x96-air-1000
>>               - bananapi,bpi-m5
>>               - hardkernel,odroid-c4
>>               - hardkernel,odroid-hc4
>> -- 
>> 2.17.1
>> 
>>