linux-kernel - Re: [PATCH v3 1/3] dt-bindings: pwm: imx: Add optional clock '32k'

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Message-ID: <a34ae0b8-ff5c-415c-9d36-1f94fba99243@denx.de>
Date: Wed, 11 Sep 2024 23:14:15 +0200
From: Marek Vasut <marex@...x.de>
To: Frank Li <Frank.li@....com>
Cc: Uwe Kleine-König <ukleinek@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Philipp Zabel <p.zabel@...gutronix.de>,
 linux-pwm@...r.kernel.org, devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 pratikmanvar09@...il.com, francesco@...cini.it,
 Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: pwm: imx: Add optional clock '32k'

On 9/11/24 11:10 PM, Frank Li wrote:
> On Wed, Sep 11, 2024 at 10:28:52PM +0200, Marek Vasut wrote:
>> On 9/10/24 9:07 PM, Frank Li wrote:
>>> The pwm in imx8qxp mipi subsystem require one extra '32k' clock. So
>>> increase maxItems for clock and clock-names.
>>
>> This mentions MIPI subsystem, but the IP in question here is PWM.
> 
> Here, mipi just name of subsystem, not related MIPI IP at all.
> 
> There are many IP in i.MX8QXP mipi subsystem, such as i2c, PWM, MIPI PHY,
> MIPI controller, PLL, clock-gate, ...
> 
>>
>> Are you sure the clock are assigned to the correct IP ?
>>
>> Shouldn't the clock be assigned to some MIPI IP instead ?
>>
> 
> Are both question still validate if treat 'mipi' just name of subsystem.
> 
>> Could you please clarify this in the commit message ?
> 
> 'mipi' just name of subsystem because the major ip is for MIPI. is word
> 'mipi-subsystem' better?
Let's find out.

What is the 32kHz clock used for in the PWM block ?