linux-kernel - Re: [PATCH v2 3/4] phy: fsl-imx8mq-usb: support alternate reference clock

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Message-ID: <spkl2zc4h2zzzp3c72ln4lorhzmejljjbso26wigifccl6uydv@4wd64dd2iggg>
Date: Tue, 14 Oct 2025 18:20:42 +0800
From: Xu Yang <xu.yang_2@....com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...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>, Li Jun <jun.li@....com>, 
	Abel Vesa <abelvesa@...nel.org>, Peng Fan <peng.fan@....com>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, linux-phy@...ts.infradead.org, devicetree@...r.kernel.org, 
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, 
	Frank Li <Frank.Li@....com>
Subject: Re: [PATCH v2 3/4] phy: fsl-imx8mq-usb: support alternate reference
 clock

On Mon, Oct 13, 2025 at 07:58:12AM +0200, Alexander Stein wrote:
> Am Freitag, 10. Oktober 2025, 13:01:12 CEST schrieb Xu Yang:
> > This phy supports both 24MHz and 100MHz clock inputs. By default it's
> > using XTAL 24MHz and the 100MHz clock is a alternate reference clock.
> > Add supports to use alternate reference clock in case 24MHz clock
> > can't work well.
> 
> This driver supports imx8mx and imx8mp as well. Do these SoC also support
> the alternative clock?

imx8mp support the alternative clock too. Note that for imx8mp,
GPR_REG0.USB_PHY_REF_CLK_SEL needs also to be set if alternative clock is
necessary. However, it's not implemented for now. 

Thanks,
Xu Yang

> 
> Best regards
> Alexander
>