linux-kernel - Re: [PATCH] dt-bindings: mfd: Improve readability for TPS65217 interrupt sources

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Message-ID: <2502592.54T1nU6yzL@wuerfel>
Date:   Tue, 22 Nov 2016 22:08:10 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Milo Kim <woogyom.kim@...il.com>, bcousson@...libre.com,
        Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Robert Nelson <robertcnelson@...il.com>
Subject: Re: [PATCH] dt-bindings: mfd: Improve readability for TPS65217 interrupt sources

On Tuesday, November 22, 2016 4:00:13 PM CET Lee Jones wrote:
> > > diff --git a/include/dt-bindings/mfd/tps65217.h b/include/dt-bindings/mfd/tps65217.h
> > > index cafb9e6..0293fdd 100644
> > > --- a/include/dt-bindings/mfd/tps65217.h
> > > +++ b/include/dt-bindings/mfd/tps65217.h
> > > @@ -19,8 +19,8 @@
> > >  #ifndef __DT_BINDINGS_TPS65217_H__
> > >  #define __DT_BINDINGS_TPS65217_H__
> > >  
> > > -#define TPS65217_IRQ_USB   0
> > > -#define TPS65217_IRQ_AC            1
> > > -#define TPS65217_IRQ_PB            2
> > > +#define TPS65217_IRQ_USB_POWER             0       /* USB power state change */
> > > +#define TPS65217_IRQ_AC_POWER              1       /* AC power state change */
> > > +#define TPS65217_IRQ_PUSHBUTTON            2       /* Push button state change */
> > 
> > This changes the ABI.
> > 
> > It will require a DT Ack.
> 
> Tell a lie.  Sorry, I was getting false positives from my grep.  It
> looks like you use the same scheme from within include/linux.  I
> suggest that you probable don't want to do that.

Doing this change however would cause a bisection problem: you
can't rename just the constants in the header or just the driver
using those constants.

	Arnd