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From: Sven Van Asbroeck <thesven73@gmail.com>
To: Andy Duan <fugang.duan@nxp.com>
Cc: Fabio Estevam <festevam@gmail.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	dl-linux-imx <linux-imx@nxp.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Shawn Guo <shawnguo@kernel.org>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [EXT] Re: [PATCH v4 2/2] ARM: imx6plus: enable internal routing of clk_enet_ref where possible
Date: Tue, 30 Jun 2020 11:23:45 -0400
Message-ID: <CAGngYiV9HqxSLV=PCPg10vqVC-SaayF5wakcWs2gBbXxgcUEPQ@mail.gmail.com> (raw)
In-Reply-To: <AM6PR0402MB36077C422DABCB4F2EA650A0FF6F0@AM6PR0402MB3607.eurprd04.prod.outlook.com>

Andy, Fabio,

On Tue, Jun 30, 2020 at 2:36 AM Andy Duan <fugang.duan@nxp.com> wrote:
>
> Sven, no matter PHY supply 125Mhz clock to pad or not,  GPR5[9] is to select RGMII
> gtx clock source from:
> - 0 Clock from pad
> - 1 Clock from PLL
>
> Since i.MX6QP can internally supply clock to MAC, we can set GPR5[9] bit by default.

That's true. But on the sabresd I notice that the PHY's ref_clk output
is from CLK_25M.
The default ref_clk freq for that PHY is 25 MHz, and I don't see anyone change
the default in the devicetree. I also see that a 25 MHz crystal is fitted, which
also suggests 25 Mhz output.

On the imx6, the default ref_clk frequency from ANATOP is 50Mhz. I don't
see anyone change that default in the devicetree either.

So is it possible that, when we switch GPR5[9] on, the external 25MHz clock
is replaced by the internal 50MHz clock? If so, I'm not sure it'll work...?

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  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-25 14:01 [PATCH v4 1/2] ARM: imx: mach-imx6q: Search for fsl, imx6q-iomuxc-gpr earlier Sven Van Asbroeck
2020-06-25 14:01 ` [PATCH v4 2/2] ARM: imx6plus: enable internal routing of clk_enet_ref where possible Sven Van Asbroeck
2020-06-28  5:05   ` [EXT] " Andy Duan
2020-06-29 13:09   ` Fabio Estevam
2020-06-29 13:40     ` Sven Van Asbroeck
2020-06-29 14:04       ` Fabio Estevam
2020-06-29 14:25       ` Fabio Estevam
2020-06-29 14:37         ` Sven Van Asbroeck
2020-06-30  6:36           ` [EXT] " Andy Duan
2020-06-30 11:49             ` Fabio Estevam
2020-07-01  1:31               ` Andy Duan
2020-06-30 15:23             ` Sven Van Asbroeck [this message]
2020-07-01  3:18               ` Andy Duan
2020-07-01  3:39                 ` Fabio Estevam
2020-07-01  3:42                   ` Andy Duan
2020-07-01  3:45                     ` Fabio Estevam
2020-07-01 13:51                       ` Sven Van Asbroeck
2020-07-01 15:30                         ` Andy Duan
2020-07-01 16:03                           ` Sven Van Asbroeck
2020-07-01 16:39                             ` Fabio Estevam
2020-06-30  2:24         ` Andy Duan

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