netdev - RE: [EXT] Re: [PATCH v5 3/3] ARM: imx6plus: optionally enable internal routing of clk_enet

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Date:   Mon, 6 Jul 2020 05:30:22 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Sven Van Asbroeck <thesven73@...il.com>
CC:     Fabio Estevam <festevam@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v5 3/3] ARM: imx6plus: optionally enable
 internal routing of clk_enet_ref

From: Sven Van Asbroeck <thesven73@...il.com> Sent: Sunday, July 5, 2020 11:34 PM
> 
>   ext phy---------| \
>                   |  |
>   enet_ref-o------|M |----pad------| \
>            |      |_/              |  |
>            |                       |M |----mac_gtx
>            |                       |  |
>            o-----------------------|_/
> 
> 
> How do we tell the clock framework that clk_pad has a mux that can be
> connected to _any_ external clock? and also enet_ref?

The clock depends on board design, HW refer guide can describe the clk
usage in detail and customer select one clk path as their board design.

To make thing simple, we can just control the second "M" that is controlled
by gpr bit.