linux-kernel - Re: [PATCH 3/4] dt-bindings: net: phy: mscc: vsc8531: fix missing "/bits/ 8" in example

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Message-ID: <20180731091151.mfgxxnz6kye4cvfv@qschulz>
Date:   Tue, 31 Jul 2018 11:11:51 +0200
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     f.fainelli@...il.com, davem@...emloft.net, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, alexandre.belloni@...tlin.com,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com
Subject: Re: [PATCH 3/4] dt-bindings: net: phy: mscc: vsc8531: fix missing
 "/bits/ 8" in example

Hi Andrew,

On Mon, Jul 30, 2018 at 03:58:13PM +0200, Andrew Lunn wrote:
> On Mon, Jul 30, 2018 at 03:02:35PM +0200, Quentin Schulz wrote:
> > The "vsc8531,led-N-mode" property is read as a u8 in the driver and
> > there aren't a lot of modes anyway.
> > 
> > Without the "/bits/ 8" in front of the value of the property, the
> > value is stored as an u32 resulting in of_read_property_u8 to always
> > return 0.
> 
> Hi Quentin
> 
> on big endian systems. I'm expect this worked on little endian ARM. I
> think the development work was done on a hacked RPi, if i remember
> correctly.
> 
> > 
> > Fix the example so that people using the property can actually use it.
> > 
> > Signed-off-by: Quentin Schulz <quentin.schulz@...tlin.com>
> > ---
> >  Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> > index 664d9d0543fc..4c7d1d384df0 100644
> > --- a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> > +++ b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> > @@ -63,6 +63,6 @@ Example:
> >                  compatible = "ethernet-phy-id0007.0570";
> >                  vsc8531,vddmac		= <3300>;
> >                  vsc8531,edge-slowdown	= <7>;
> > -                vsc8531,led-0-mode	= <LINK_1000_ACTIVITY>;
> > -                vsc8531,led-1-mode	= <LINK_100_ACTIVITY>;
> > +                vsc8531,led-0-mode	= /bits/ 8 <LINK_1000_ACTIVITY>;
> > +                vsc8531,led-1-mode	= /bits/ 8 <LINK_100_ACTIVITY>;
> 
> I don't know the device tree language well enough...
> 
> Would this work?
> 
> vsc8531,led-1-mode	= < /bits/ 8  LINK_100_ACTIVITY>;
> 
> If so, you can make it part of the #define.

It does not compile unfortunately. According to the documentation of
DTC[1], /bits/ 8 should prefix the value/array so I guess we're out of
luck for using the same define in the kernel and DTS if we want to
abstract this prefix.

Quentin

[1] https://git.kernel.org/pub/scm/utils/dtc/dtc.git/tree/Documentation/dts-format.txt#n46

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