linux-kernel - Re: [PATCH v2 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332 platform

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Message-ID: <a4f566c2-17bd-480b-be72-fef808f0be43@quicinc.com>
Date: Wed, 20 Dec 2023 18:11:34 +0800
From: Jie Luo <quic_luoj@...cinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Conor Dooley
	<conor@...nel.org>
CC: <agross@...nel.org>, <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <robert.marko@...tura.hr>, <linux-arm-msm@...r.kernel.org>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_srichara@...cinc.com>
Subject: Re: [PATCH v2 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332
 platform



On 12/20/2023 3:28 PM, Krzysztof Kozlowski wrote:
> On 16/12/2023 16:37, Jie Luo wrote:
>>>
>>> I'm surprised you didn't pick up on this, but there are actually _2_
>>> internal references, which I have just noticed while double checking the
>>> binding patch.
>>
>> i noticed this, the reference clock source can be supported by clocks as
>> you suggested here, it is really helpful.
>>>
>>> What is the impact of using the 48 MHz or 96 MHz internal reference?
>> They works on the different IPQ platform, 96MHZ internal reference is
>> used on IPQ5018, the internal 48MHZ is used on the IPQ5332, that is
> 
> So the binding is just incorrect. Why do you even consider configuring
> 96 MHz internal reference on IPQ5332?
> 
> 
> Best regards,
> Krzysztof
> 

Normally there is the fix reference clock source used per each IPQ
platform, but we should keep it configurable, the CMN PLL block is
same among the supported IPQ platforms, Maybe there is special case
to switch the reference clock in the future.
i will also update the dtbinding doc to limit the reference clock based
on the compatible string.