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 [thread overview]
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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next prev parent reply other threads:[~2020-06-30 15:25 UTC|newest]
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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