linux-kernel - Re: RFC: what do we do with system controllers?

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Message-ID: <CACRpkdaTJFL0A3caA4mNjxHTuXLC5u87OZ2yR=1ChiCFQL7c2A@mail.gmail.com>
Date:	Wed, 29 Feb 2012 10:59:23 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
	Paul Walmsley <paul@...an.com>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mattias NILSSON <mattias.i.nilsson@...ricsson.com>,
	Rickard ANDERSSON <rickard.andersson@...ricsson.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
Subject: Re: RFC: what do we do with system controllers?

On Tue, Feb 28, 2012 at 9:38 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Tue, Feb 28, 2012 at 06:48:12AM +0100, Linus Walleij wrote:
>> Mainly addressed to Greg but anyone is welcome to join the
>> discussion...
>>
>> Several ARM platforms have system controllers. In this I
>> include all custom terminology such as:
>>
>> - System Control
>> - Chip Controller
>> - Core Module control registers
>> - Power Reset Control Management Units
>> - Multimedia Communications Port
>
> Why do you include this?  If you include this, you should include things
> like SSP/SPI ports, I2C and other such buses.

Mainly because it has these specific MCP controller oddity
functions:

mcp_set_telecom_divisor()
mcp_set_audio_divisor()

i.e. it has some "strangeness" of system controller type
(telecom? que?) But it's quite little and no big deal, drop
it off the list.

Thanks,
Linus Walleij
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