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Message-ID: <b6d782ef-b375-1e73-a384-1ff37c1548a7@kernel.org>
Date: Wed, 8 Feb 2023 10:32:53 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Russell King <linux@...linux.org.uk>,
Heiner Kallweit <hkallweit1@...il.com>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Mark Lee <Mark-MC.Lee@...iatek.com>,
John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Matthias Brugger <matthias.bgg@...il.com>,
DENG Qingfang <dqfext@...il.com>,
Landen Chao <Landen.Chao@...iatek.com>,
Sean Wang <sean.wang@...iatek.com>,
Paolo Abeni <pabeni@...hat.com>,
Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Vladimir Oltean <olteanv@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Jianhui Zhao <zhaojh329@...il.com>,
Bjørn Mork <bjorn@...k.no>
Subject: Re: [PATCH v2 03/11] dt-bindings: arm: mediatek: add
'mediatek,pn_swap' property
On 07/02/2023 19:00, Daniel Golle wrote:
> Hi Krzysztof,
>
> On Tue, Feb 07, 2023 at 06:38:23PM +0100, Krzysztof Kozlowski wrote:
>> On 07/02/2023 15:19, Daniel Golle wrote:
>>> Add documentation for the newly introduced 'mediatek,pn_swap' property
>>> to mediatek,sgmiisys.txt.
>>>
>>
>> Please use scripts/get_maintainers.pl to get a list of necessary people
>> and lists to CC. It might happen, that command when run on an older
>> kernel, gives you outdated entries. Therefore please be sure you base
>> your patches on recent Linux kernel.
>>
>>> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
>>> ---
>>> .../devicetree/bindings/arm/mediatek/mediatek,sgmiisys.txt | 4 ++++
>>> 1 file changed, 4 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,sgmiisys.txt b/Documentation/devicetree/bindings/arm/mediatek/mediatek,sgmiisys.txt
>>> index d2c24c277514..b38dd0fde21d 100644
>>> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,sgmiisys.txt
>>> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,sgmiisys.txt
>>> @@ -14,6 +14,10 @@ Required Properties:
>>> - "mediatek,mt7986-sgmiisys_1", "syscon"
>>> - #clock-cells: Must be 1
>>>
>>> +Optional Properties:
>>> +
>>> +- mediatek,pn_swap: Invert polarity of the SGMII data lanes.
>>
>> No:
>> 1. No new properties for TXT bindings,
>
> So I'll have to convert the bindings to YAML, right?
Yes, please.
>
>> 2. Underscore is not allowed.
>
> Ack, will change the name of the property.
>
>> 3. Does not look like property of this node. This is a clock controller
>> or system controller, not SGMII/phy etc.
>
> The register range referred to by this node *does* represent also an
> SGMII phy. These sgmiisys nodes also carry the 'syscon' compatible, and
> are referenced in the node of the Ethernet core, and then used by
> drivers/net/ethernet/mediatek/mtk_sgmii.c using syscon_node_to_regmap.
> (This is the current situation already, and not related to the patchset
> now adding only a new property to support hardware which needs that)
Just because a register is located in syscon block, does not mean that
SGMII configuration is a property of this device.
>
> So: Should I introduce a new binding for the same compatible strings
> related to the SGMII PHY features? Or is it fine in this case to add
> this property to the existing binding?
The user of syscon should configure it. I don't think you need new
binding. You just have to update the user of this syscon.
Best regards,
Krzysztof
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