linux-kernel - Re: [PATCH 2/2] net: ethernet: fsl: add phy reset after clk enable option

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Message-ID: <20170706135557.GC8810@lunn.ch>
Date:   Thu, 6 Jul 2017 15:55:57 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Richard Leitner <richard.leitner@...data.com>
Cc:     fugang.duan@....com, robh+dt@...nel.org, mark.rutland@....com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dev@...l1n.net
Subject: Re: [PATCH 2/2] net: ethernet: fsl: add phy reset after clk enable
 option

Hi Richard

> diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt
> index 6f55bdd..1766579 100644
> --- a/Documentation/devicetree/bindings/net/fsl-fec.txt
> +++ b/Documentation/devicetree/bindings/net/fsl-fec.txt
> @@ -23,6 +23,9 @@ Optional properties:
>  - phy-handle : phandle to the PHY device connected to this device.
>  - fixed-link : Assume a fixed link. See fixed-link.txt in the same directory.
>    Use instead of phy-handle.
> +- phy-reset-after-clk-enable : If present then a phy reset and configuration
> +  will be performed everytime after the clocks are enabled. This is required
> +  for some PHYs to work properly.

It sounds like this issue will apply to any LAN8710 which has its
clock fiddled with. So this should be a centrally documented property,
which any MAC driver can implement. Please move the above text to
ethernet.txt, and instead have:

 - phy-reset-after-clk-enable : See ethernet.txt

 Thanks
	 Andrew