linux-kernel - Re: [RFC PATCH net v2 2/3] dt: bindings: add ethernet phy eee-disable-advert option documentation

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Date:   Mon, 21 Nov 2016 17:47:33 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Kevin Hilman <khilman@...libre.com>,
        linux-kernel@...r.kernel.org, Andre Roth <neolynx@...il.com>,
        linux-amlogic@...ts.infradead.org, Carlo Caione <carlo@...one.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH net v2 2/3] dt: bindings: add ethernet phy
 eee-disable-advert option documentation

> What I did not realize when doing this patch for the realtek driver is
> that there is already 6 valid modes defined in the kernel
> 
> #define MDIO_EEE_100TX		MDIO_AN_EEE_ADV_100TX	/*
> 100TX EEE cap */
> #define MDIO_EEE_1000T		MDIO_AN_EEE_ADV_1000T	/*
> 1000T EEE cap */
> #define MDIO_EEE_10GT		0x0008	/* 10GT EEE cap */
> #define MDIO_EEE_1000KX		0x0010	/* 1000KX EEE cap
> */
> #define MDIO_EEE_10GKX4		0x0020	/* 10G KX4 EEE cap
> */
> #define MDIO_EEE_10GKR		0x0040	/* 10G KR EEE cap
> */
> 
> I took care of only 2 in the case of realtek.c since it only support
> MDIO_EEE_100TX and MDIO_EEE_1000T.
> 
> Defining a property for each is certainly doable but it does not look
> very nice either. If it extends in the future, it will get even more
> messier, especially if you want to disable everything.

Yes, agreed.
 
> What do you think about keeping a single mask value but use the define
> above in the DT ? It would be more readable than hex and easy to
> extend, don't you think ?
> 
> These defines are already part of the uapi so I guess we can use those
> in the DT bindings ?

I don't think they are accessible from the dtc include path. You will
need to make a copy, in include/dt-bindings/net/phy.h

But yes, using these defines is a good idea.

     Andrew