linux-kernel - Re: [PATCH 4/6] phy: twl4030-usb: add ABI documentation

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Message-ID: <20150418083402.5b626011@notabene.brown>
Date:	Sat, 18 Apr 2015 08:34:02 +1000
From:	NeilBrown <neilb@...e.de>
To:	Pavel Machek <pavel@....cz>
Cc:	NeilBrown <neil@...wn.name>,
	Kishon Vijay Abraham I <kishon@...com>,
	Tony Lindgren <tony@...mide.com>,
	GTA04 owners <gta04-owner@...delico.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] phy: twl4030-usb: add ABI documentation

On Sat, 18 Apr 2015 00:14:36 +0200 Pavel Machek <pavel@....cz> wrote:

> On Thu 2015-04-16 18:03:04, NeilBrown wrote:
> > From: NeilBrown <neilb@...e.de>
> > 
> > This driver device one local attribute: vbus.
> > Describe that in Documentation/ABI/testing/sysfs-platform/twl4030-usb.
> > 
> > Signed-off-by: NeilBrown <neil@...wn.name>
> > ---
> >  .../ABI/testing/sysfs-platform-twl4030-usb         |    8 ++++++++
> >  1 file changed, 8 insertions(+)
> >  create mode 100644 Documentation/ABI/testing/sysfs-platform-twl4030-usb
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-platform-twl4030-usb b/Documentation/ABI/testing/sysfs-platform-twl4030-usb
> > new file mode 100644
> > index 000000000000..512c51be64ae
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/sysfs-platform-twl4030-usb
> > @@ -0,0 +1,8 @@
> > +What: /sys/bus/platform/devices/*twl4030-usb/vbus
> > +Description:
> > +	Read-only status reporting if VBUS (approx 5V)
> > +	is being supplied by the USB bus.
> > +
> > +	Possible values: "on", "off".
> 
> Would bit be better to have values "0" and "1"? Kernel usually does
> that for booleans...

1/ The code  already uses "on" and "off", so changing would be an ABI
breakage.

2/ No it doesn't.
 For modules params, the kernel uses "Y" and "N"

  git grep '? "on" : "off"'  | wc

 find 172 matches.

NeilBrown

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