From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arnd Bergmann <arnd@arndb.de>
Subject: Re: [RFC PATCHv1 1/2] Export SoC info through sysfs
Date: Thu, 10 Mar 2011 16:02:18 +0100
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Cc: ext Nishanth Menon <nm@ti.com>, ext Tony Lindgren <tony@atomide.com>, Peter De-Schrijver <Peter.De-Schrijver@nokia.com>, Ambresh <a0393775@ti.com>, Saravana Kannan <skannan@codeaurora.org>, Jouni Hogander <jouni.hogander@nokia.com>, Lee Jones <Lee.Jones@linaro.org>, Rabin VINCENT <rabin.vincent@stericsson.com>, Russell King <linux@arm.linux.org.uk>, Jonas ABERG <jonas.aberg@stericsson.com>, ext Kevin Hilman <khilman@deeprootsystems.com>, David Brown <davidb@codeaurora.org>, Maxime Coquelin <maxime.coquelin-nonst@stericsson.com>, "linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>, Loic PALLARDY <loic.pallardy@stericsson.com>, "eduardo.valentin@nokia.com" <eduardo.valentin@nokia.com>, maxime_coquelin@yahoo.fr, Ryan Mallon <ryan@bluewatersys.com>, Linux-OMAP <linux-omap@vger.kernel.org>, Daniel Walker <dwalker@codeaurora.org>, Linus Walleij <linus.ml.wallei>
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On Thursday 10 March 2011, Mark Brown wrote:
> Most of the devices doing that on ARMs tend to be devices where there's
> no bus that it's meaningful to expose to software - they'll typically be
> hanging off an AHB or APB bus which has either no real software control
> or control which is very heavily tied into the overall system control
> and so is better treated over the whole SoC rather than the bus.

I can accept that it's reasonable to put all devices under
/sys/devices/platform/ that are on the same top-level AHB or APB bus,
although I also don't see a reason against making that bus a single
device.

The one thing that really doesn't belong in /sys/devices/platform/
however are devices that are clearly children of some other
device, e.g. a UART behind MFD behind I2C behind AHB.

	Arnd