linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: Add Freescale i.MX8qm Mixel LVDS PHY binding

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Date:   Mon, 20 Jun 2022 12:38:53 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Liu Ying <victor.liu@....com>, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     kishon@...com, vkoul@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com
Subject: Re: [PATCH 1/2] dt-bindings: phy: Add Freescale i.MX8qm Mixel LVDS
 PHY binding

On 20/06/2022 09:56, Liu Ying wrote:
> On Mon, 2022-06-20 at 09:35 +0200, Krzysztof Kozlowski wrote:
>> On 20/06/2022 05:06, Liu Ying wrote:
>>> On Sun, 2022-06-19 at 14:11 +0200, Krzysztof Kozlowski wrote:
>>>> On 18/06/2022 11:22, Liu Ying wrote:
>>>>> This patch adds bindings for Mixel LVDS PHY found on
>>>>> Freescale i.MX8qm SoC.
>>>>>
>>>>> Signed-off-by: Liu Ying <victor.liu@....com>
>>>>> ---
>>>>>  .../bindings/phy/mixel,lvds-phy.yaml          | 64
>>>>> +++++++++++++++++++
>>>>>  1 file changed, 64 insertions(+)
>>>>>  create mode 100644
>>>>> Documentation/devicetree/bindings/phy/mixel,lvds-phy.yaml
>>>>> diff --git a/Documentation/devicetree/bindings/phy/mixel,lvds-
>>>>> phy.yaml b/Documentation/devicetree/bindings/phy/mixel,lvds-
>>>>> phy.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..de964ffb9356
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/phy/mixel,lvds-phy.yaml
>>>>> @@ -0,0 +1,64 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: 
>>>>>
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fphy%2Fmixel%2Clvds-phy.yaml%23&amp;data=05%7C01%7Cvictor.liu%40nxp.com%7Cc7d6216ac12148ec95d008da528f78eb%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637913073407696040%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=m588CiXOaJhWFbpEal3MjZaHtvOTUOVIujydIdPxSHg%3D&amp;reserved=0
>>>>> +$schema: 
>>>>>
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=05%7C01%7Cvictor.liu%40nxp.com%7Cc7d6216ac12148ec95d008da528f78eb%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637913073407696040%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=IGn5f05QrzyX05k%2FKgTitdq6OYN2FmdpsO6qHXun55Y%3D&amp;reserved=0
>>>>> +
>>>>> +title: Mixel LVDS PHY for Freescale i.MX8qm SoC
>>>>
>>>> If Mixel is a vendor, it needs it's vendor prefix documented and
>>>> used
>>>> in
>>>> compatible. Filename should match compatible. If it is not a
>>>> vendor,
>>>> then filename should be "fsl,imx8qm-lvds-phy.yaml"
>>>
>>> Mixel is a vendor. I'll document the vendor prefix and set
>>> 'fsl,imx8qm-lvds-phy' and 'mixel,lvds-phy' as compatible's enum.
>>> I'll keep the filename as-is.
>>
>> mixel,lvds-phy is not a good compatible (and filename) because it is
>> not
>> specific about component version. Please use specific compatibles
>> only
>> thus also specific filename (filename should match first compatible).
> 
> All the information about component version I can find in the PHY IP's
> data sheet is '28FDSOI-LVDS-1250-8CH-TX-PLL'. '28FDSOI' looks like the
> technology name. Do you think the compatible name can be
> 'mixel,lvds-1250-8ch-tx-pll'? Or, any better option?
> 
> If the compatible name is ok, does the below compabitle property look
> ok?
> 
> ===================8<==============
>   compatible:
>     enum:
>       - mixel,lvds-1250-8ch-tx-pll
>       - fsl,imx8qm-lvds-phy
> ===================8<==============

https://mixel.com/wp-content/mixel/pdf/2018/MXL-LVDS-1250-8CH-TX-PLL_SS_28FDSOI.pdf

mentions entire name as a device name, so with 28FDSOI, but your choice
is also good.


Best regards,
Krzysztof