linux-kernel - Re: [net-next,PATCH 4/4] dt-bindings: mdio-ipq4019: add clock support

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Message-ID: <CA+HBbNGcV0H4L4gzWOUs8GDkiMEOaGdeVhAbtfcT5-PGmVJjfA@mail.gmail.com>
Date:   Thu, 2 Jul 2020 21:18:38 +0200
From:   Robert Marko <robert.marko@...tura.hr>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        robh+dt@...nel.org
Subject: Re: [net-next,PATCH 4/4] dt-bindings: mdio-ipq4019: add clock support

On Thu, Jul 2, 2020 at 3:38 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > +  clock-frequency:
> > +    default: 100000000
>
> IEEE 802.3 says the default should be 2.5MHz. Some PHYs will go
> faster, but 100MHz seems unlikely!
This MDIO controller has an internal divider, by default its set for
100MHz clock.
In IPQ4019 MDIO clock is not controllable but in IPQ6018 etc it's controllable.
That is the only combination I have currently seen used by Qualcomm.
>
>      Andrew