linux-kernel - Re: [PATCH v2 3/3] net: ethernet: fec: fix refclk enable for SMSC LAN8710/20

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Message-ID: <CAMuHMdWPQiXRnj2a71Q7VafftBtAcyc+HUEAgze9=UDdBpmLug@mail.gmail.com>
Date:   Mon, 20 Nov 2017 14:40:13 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Richard Leitner <richard.leitner@...data.com>
Cc:     Andy Duan <fugang.duan@....com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Richard Leitner <dev@...l1n.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH v2 3/3] net: ethernet: fec: fix refclk enable for SMSC LAN8710/20

Hi Richard,

On Mon, Nov 20, 2017 at 2:21 PM, Richard Leitner
<richard.leitner@...data.com> wrote:
> On 11/20/2017 02:13 PM, Geert Uytterhoeven wrote:
>> On Mon, Nov 20, 2017 at 1:55 PM, Richard Leitner
>> <richard.leitner@...data.com> wrote:
>>> On 11/20/2017 11:35 AM, Andy Duan wrote:
>>>> 3. add reset gpio descriptor for common phy device driver.
>>>
>>> ... if I understood it correctly the patch called "Teach phylib
>>> hard-resetting devices" by Geert and Sergei is exactly doing this:
>>>         https://patchwork.ozlabs.org/cover/828503/
>>>         https://lkml.org/lkml/2017/10/20/166
>>>
>>> So I'll implement the phy_reset_after_clk_enable function atop of this
>>> patch-set and add a note that my patch-series depends on it. Would that
>>> be OK?
>>
>> I will update and respin that patch series after the merge window has closed.
>
> Ok. Thank you for the quick response an this information.
>
> For the Freescale Fast Ethernet Controller (FEC) there are currently (in
> addition to the reset gpio) two additional optional dt properties for
> the reset:
>  - phy-reset-duration : Reset duration in milliseconds.
>  - phy-reset-post-delay : Post reset delay in milliseconds.
>
> IMHO it would make sense to include them also in the phylib
> implementation. What do you think about it? Should I include it in my
> patch-series?

Sure, you can always extend phylib, building on top of our simple reset
implementation.

BTW, I think phy-reset-{duration,post-delay} should be moved to the
phy node as well, dropping the "phy-" prefix in the process.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds