linux-kernel - Re: [PATCH V2] dt-bindings: clock: add i.MX8M Anatop

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Message-ID: <a56aad01-222d-5637-7757-2a1afeed945d@linaro.org>
Date:   Fri, 16 Sep 2022 10:59:37 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Peng Fan <peng.fan@....com>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "abelvesa@...nel.org" <abelvesa@...nel.org>,
        "abel.vesa@...aro.org" <abel.vesa@...aro.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>
Cc:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] dt-bindings: clock: add i.MX8M Anatop

On 14/09/2022 01:11, Peng Fan wrote:
>> Subject: Re: [PATCH V2] dt-bindings: clock: add i.MX8M Anatop
>>
>> On 13/09/2022 11:29, Peng Fan (OSS) wrote:
>>> From: Peng Fan <peng.fan@....com>
>>>
>>> i.MX8M Family features an anatop module the produces PLL to clock
>>> control module(CCM) root clock. Add the missing yaml file.
>>>
>>> Signed-off-by: Peng Fan <peng.fan@....com>
>>> ---
>>>
>>> V2:
>>>  Drop syscon, use clock-controller
>>>  Add fsl vendor prefix
>>>  Add interrupt property
>>>
>>>  dts update not included, so there will be dtbs_check fail.
>>>
>>>  .../bindings/clock/fsl,imx8m-anatop.yaml      | 46 +++++++++++++++++++
>>>  1 file changed, 46 insertions(+)
>>>  create mode 100644
>>> Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
>>> b/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
>>> new file mode 100644
>>> index 000000000000..2c0efa58d898
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
>>> @@ -0,0 +1,46 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
>>> +---
>>> +$id:
>>>
>> +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
>>> +cetree.org%2Fschemas%2Fclock%2Ffsl%2Cimx8m-
>> anatop.yaml%23&amp;data=05
>>>
>> +%7C01%7Cpeng.fan%40nxp.com%7Ca3a47985f9d9452744af08da9590fe79
>> %7C686ea
>>>
>> +1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637986747221860721%7CU
>> nknown%7C
>>>
>> +TWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWw
>> iLCJXV
>>>
>> +CI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=I4LSaFBDMZv%2FcgFyIR1w
>> m2Irc%2F%2F
>>> +Z9eKChPCJY7XMfDo%3D&amp;reserved=0
>>> +$schema:
>>>
>> +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
>>> +cetree.org%2Fmeta-
>> schemas%2Fcore.yaml%23&amp;data=05%7C01%7Cpeng.fan%
>>>
>> +40nxp.com%7Ca3a47985f9d9452744af08da9590fe79%7C686ea1d3bc2b4c6
>> fa92cd9
>>>
>> +9c5c301635%7C0%7C0%7C637986747221860721%7CUnknown%7CTWFpb
>> GZsb3d8eyJWI
>>>
>> +joiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7
>> C3000%
>>>
>> +7C%7C%7C&amp;sdata=dm5exAJpmPmY%2B0vCuZtpzt7k8GHeKZKtitSvep0
>> 5G%2Bw%3D
>>> +&amp;reserved=0
>>> +
>>> +title: NXP i.MX8M Family Anatop Module
>>> +
>>> +maintainers:
>>> +  - Peng Fan <peng.fan@....com>
>>> +
>>> +description: |
>>> +  NXP i.MX8M Family anatop PLL module which generates PLL to CCM root.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    oneOf:
>>> +      - enum:
>>> +          - fsl,imx8mm-anatop
>>> +          - fsl,imx8mq-anatop
>>> +      - items:
>>> +          - enum:
>>> +              - fsl,imx8mn-anatop
>>> +              - fsl,imx8mp-anatop
>>> +          - const: fsl,imx8mm-anatop
>>
>> You dropped syscon which solves part of my previous comment. I suggested
>> to make it proper clock provider, so you would need clock-cells. Any reason
>> it is no a real clock provider?
> 
> oh. I overlooked this point. The current i.MX8M linux clk driver directly
> search the node to get anatop base:
> https://elixir.bootlin.com/linux/v6.0-rc5/source/drivers/clk/imx/clk-imx8mp.c#L416
> 
> Not take it as a real clock provider from linux view.
> 
> I will add clock-cells in v3.

Why the Linux driver appeared before bindings? Broken implementation is
not a valid reason to push such bindings. :/


Best regards,
Krzysztof