netdev - Re: [EXT] Re: [PATCH net 3/4] ARM: dts: imx6: update fec gpr property to match new format

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Date:   Thu, 21 May 2020 15:07:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Andy Duan <fugang.duan@....com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "martin.fuzzey@...wbird.group" <martin.fuzzey@...wbird.group>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH net 3/4] ARM: dts: imx6: update fec gpr
 property to match new format

> Andrew, patch#1 in the series will parse the property to get register offset and bit.
> Patch#2 describes the property format as below:
>        <&gpr req_gpr req_bit>.
>         gpr is the phandle to general purpose register node.
>         req_gpr is the gpr register offset for ENET stop request.
>         req_bit is the gpr bit offset for ENET stop request.
> 
> All i.MX support wake-on-lan, imx6q/dl/qp is the first platforms in upstream to support it.
> As you know, most of i.MX chips has two ethernet instances, they have different gpr bit.
> 
> gpr is used to enter/exit stop mode for soc. So it can be defined in dtsi file.
> "fsl,magic-packet;" property is define the board wakeup capability.
> 
> I am not sure whether above information is clear for you why to add the patch set.

I understand the patch. What is missing is an actual user, where you
have two interfaces, doing WOL, with different values for gpr. We
don't add new kernel APIs without a user.

    Andrew