netdev - Re: [RESEND PATCH 3/4] arm64: dts: rockchip: support gmac for rk3399

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Date:   Wed, 31 Aug 2016 14:45:40 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     Caesar Wang <wxt@...k-chips.com>, netdev@...r.kernel.org,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Brian Norris <briannorris@...omium.org>,
        Derek Basehore <dbasehore@...omium.org>,
        Roger Chen <roger.chen@...k-chips.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Xing Zheng <zhengxing@...k-chips.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Jianqun Xu <jay.xu@...k-chips.com>,
        Elaine Zhang <zhangqing@...k-chips.com>,
        David Wu <david.wu@...k-chips.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH 3/4] arm64: dts: rockchip: support gmac for rk3399

Hi,

On Wed, Aug 31, 2016 at 2:29 PM, Heiko Stübner <heiko@...ech.de> wrote:
>> IMHO it would be nice if this were broken into two patches.
>>
>> 1. First patch would be the power domain patch and that could land any
>> time.  You wouldn't actually be able to use the gmac but at least
>> you'd be able to turn off its power.  This would be a handy patch to
>> be able to backport if you happened to not need Ethernet support but
>> wanted to save power.
>>
>> 2. Second patch would actually add the gmac.
>
> according to my talk with Caesar in the real v1, the gmac even with power-
> domains should work just nicely even without the dts patches, as the driver
> core takes care of powering up the pd before probe.
>
> But I may miss some peculiarity of the dwmac?

Nothing that I'm terribly aware of.  I was just being selfish because:

1. I'm on a board where I don't need Ethernet.

2. I'm running a semi old kernel (4.4)

3. I don't want to pick back the various fixes that might be needed to
make gmac work on rk3399 to that old kernel.

4. I want it very obvious that gmac isn't really supported on this old
kernel on rk3399 (and having stmmac not in the device tree would make
it very obvious)

5. I do want the power savings of turning the power domains off for the gmac.


If this patch is broken in two then I can pick back just the power
domain patch.  :-P



-Doug