Date: Wed, 29 Feb 2012 10:08:10 +0000
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Greg KH <gregkh@linuxfoundation.org>, linux-kernel@vger.kernel.org,
        Paul Walmsley <paul@pwsan.com>, linux-arm-kernel@lists.infradead.org,
        Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>,
        Samuel Ortiz <sameo@linux.intel.com>,
        Mattias NILSSON <mattias.i.nilsson@stericsson.com>,
        Rickard ANDERSSON <rickard.andersson@stericsson.com>,
        Mark Brown <broonie@opensource.wolfsonmicro.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Nicolas Pitre <nicolas.pitre@linaro.org>
Subject: Re: RFC: what do we do with system controllers?
Message-ID: <20120229100810.GH18045@n2100.arm.linux.org.uk>
References: <CACRpkdY1W-RGE0JL4Sx5UcPY-EGieu8vo7H0fp9xyXtegpaaKw@mail.gmail.com> <20120228083833.GB18045@n2100.arm.linux.org.uk> <CACRpkdaTJFL0A3caA4mNjxHTuXLC5u87OZ2yR=1ChiCFQL7c2A@mail.gmail.com>
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On Wed, Feb 29, 2012 at 10:59:23AM +0100, Linus Walleij wrote:
> On Tue, Feb 28, 2012 at 9:38 AM, Russell King - ARM Linux
> <linux@arm.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.

MCP = Multimedia Communication Port.  It is designed to work with the
UCB1200 and UCB1300 codec devices, which have two parts to them: a
telecom / pots interface and an audio interface.

The host side needs to be programmed with the appropriate sample rate -
it's the host side which controls the sample rate not the codec.
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