linux-kernel - Re: [PATCH v2 05/11] net: stmmac: dwmac-rk: Add internal phy support

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Date:   Wed, 2 Aug 2017 11:46:57 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     "David.Wu" <david.wu@...k-chips.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Mark Rutland <mark.rutland@....com>,
        Tao Huang <huangtao@...k-chips.com>, hwg@...k-chips.com,
        Heiko Stübner <heiko@...ech.de>,
        Arnd Bergmann <arnd@...db.de>,
        devicetree <devicetree@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        netdev <netdev@...r.kernel.org>, Olof Johansson <olof@...om.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        David Miller <davem@...emloft.net>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        alexandre.torgue@...com
Subject: Re: [PATCH v2 05/11] net: stmmac: dwmac-rk: Add internal phy support

Hi David, Florian, Andrew

(resent in plain text)

On Fri, Jul 28, 2017 at 2:56 PM, David.Wu <david.wu@...k-chips.com> wrote:
>
> Hi Florian,
>
> 在 2017/7/28 0:54, Florian Fainelli 写道:
>>
>> - if you need knowledge about this PHY connection type prior to binding
>> the PHY device and its driver (that is, before of_phy_connect()) we
>> could add a boolean property e.g: "phy-is-internal" that allows us to
>> know that, or we can have a new phy-mode value, e.g: "internal-rmii"
>> which describes that, either way would probably be fine, but the former
>> scales better
>>
>
> Using "phy-is-internal" is very helpful, but it is easy to confuse with
> the real internal PHY, may we use the other words like phy is inlined.

If "internal" is confusing, would "phy-is-integrated" in the MAC node work?

Either way we would like to have a definitive solution to this. Our
dwmac-sun8i driver is already in v4.13-rc1, with a somewhat flaky
method of knowing whether the internal PHY is used (phy-mode = "mii").

We really want a fix for this release, otherwise we would be force
to revert either the internal PHY part or the whole driver.

ChenYu

>
>> Then again, using phy-mode = "internal" even though this is Reduced MII
>> is not big of a deal IMHO as long as there is no loss of information and
>> that internal de-facto means internal reduced MII for instance.
>> --
>
>
>
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> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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