linux-kernel - Re: musb-hdrc: "Vbus off, timeout 1100 msec" message does not belong in sysfs

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Message-ID: <20150709214610.GA20890@amd>
Date:	Thu, 9 Jul 2015 23:46:10 +0200
From:	Pavel Machek <pavel@....cz>
To:	Greg KH <greg@...ah.com>, balbi@...com, bigeasy@...utronix.de,
	george.cherian@...com, tony@...mide.com, varkabhadram@...il.com,
	linux-kernel@...r.kernel.org
Cc:	pali.rohar@...il.com, sre@...ian.org, sre@...g0.de,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com
Subject: Re: musb-hdrc: "Vbus off, timeout 1100 msec" message does not belong
 in sysfs

On Thu 2015-07-09 23:39:22, Pavel Machek wrote:
> Hi!
> 
> sysfs should contain one value per file. This one has at least two,
> with nice english sentence as a bonus.
> 
> root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
> cat vbus
> Vbus off, timeout 1100 msec
> 
> :-(.

Plus, documentation for this is nowhere to be seen:

pavel@amd:/data/l/linux-n900$ grep -ri musb Documentation/ABI/
pavel@amd:/data/l/linux-n900$

..which is a shame, because it is not really clear how to use this
one:

root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
cat mode
b_idle
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
echo a_suspend > mode
-bash: echo: write error: Invalid argument
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
echo a > mode
-bash: echo: write error: Invalid argument
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
echo a_host > mode
-bash: echo: write error: Invalid argument
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
echo b_host > mode
-bash: echo: write error: Invalid argument
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
echo a_idle > mode
-bash: echo: write error: Invalid argument
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#
echo b_wait_acon > mode
-bash: echo: write error: Invalid argument
root@...0:/sys/devices/platform/68000000.ocp/480ab000.usb_otg_hs/musb-hdrc.0.auto#


									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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