linux-kernel - Re: [RFC PATCHv2 1/4] drivers/otp: add initial support for OTP memory

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Message-Id: <201103252301.56718.arnd@arndb.de>
Date:	Fri, 25 Mar 2011 23:01:56 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Greg KH <gregkh@...e.de>
Cc:	Jamie Iles <jamie@...ieiles.com>, linux-kernel@...r.kernel.org,
	vapier@...too.org
Subject: Re: [RFC PATCHv2 1/4] drivers/otp: add initial support for OTP memory

On Friday 25 March 2011 22:12:46 Greg KH wrote:
> > Why is this a bus? You don't have any device matching code or similar,
> > and the devices typically are on an existing bus_type (e.g. platform_bus).
> > I think it would make more sense to do this as a class.
> 
> No, for new things, we want to use busses instead of classes please.
> Especially as this does create devices, which are best put on a bus
> somewhere.

I don't understand. Isn't that rather inconsistent?

I realize the same thing came up with the IIO subsystem, where I also
didn't understand it.

In my mental model of Linux drivers, a bus is something that physically
connects devices and the bus code matches devices with drivers, while a
class groups logical devices that get created by the driver itself.

	Arnd
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