netdev - Re: [PATCH net-next v2 3/8] net: phy: dp83867: Add ability to disable output clock

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Message-ID: <20190522185108.GA7281@lunn.ch>
Date:   Wed, 22 May 2019 20:51:08 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Trent Piepho <tpiepho@...inj.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net-next v2 3/8] net: phy: dp83867: Add ability to
 disable output clock

On Wed, May 22, 2019 at 06:43:22PM +0000, Trent Piepho wrote:
> Generally, the output clock pin is only used for testing and only serves
> as a source of RF noise after this.  It could be used to daisy-chain
> PHYs, but this is uncommon.  Since the PHY can disable the output, make
> doing so an option.  I do this by adding another enumeration to the
> allowed values of ti,clk-output-sel.
> 
> The code was not using the value DP83867_CLK_O_SEL_REF_CLK as one might
> expect: to select the REF_CLK as the output.  Rather it meant "keep
> clock output setting as is", which, depending on PHY strapping, might
> not be outputting REF_CLK.
> 
> Change this so DP83867_CLK_O_SEL_REF_CLK means enable REF_CLK output.
> Omitting the property will leave the setting as is (which was the
> previous behavior in this case).
> 
> Out of range values were silently converted into
> DP83867_CLK_O_SEL_REF_CLK.  Change this so they generate an error.
> 
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: Heiner Kallweit <hkallweit1@...il.com>
> Signed-off-by: Trent Piepho <tpiepho@...inj.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew