linux-kernel - Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

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Message-ID: <4E497DA0.7030408@codeaurora.org>
Date:	Mon, 15 Aug 2011 14:12:16 -0600
From:	Kenneth Heitke <kheitke@...eaurora.org>
To:	Russell King <rmk@....linux.org.uk>
CC:	Jean Delvare <khali@...ux-fr.org>, Ben Dooks <ben-linux@...ff.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	davidb@...eaurora.org, bryanh@...eaurora.org,
	linux-arm-msm@...r.kernel.org,
	Sagar Dharia <sdharia@...eaurora.org>, rdunlap@...otime.net,
	john.stultz@...aro.org, arnd@...db.de, akpm@...ux-foundation.org,
	ohad@...ery.com, gregkh@...e.de, stefanr@...6.in-berlin.de,
	lethal@...ux-sh.org, linville@...driver.com, zajec5@...il.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

On 08/15/2011 01:37 PM, Russell King wrote:
> On Wed, Aug 10, 2011 at 05:31:28PM -0600, Kenneth Heitke wrote:
>> From: Sagar Dharia<sdharia@...eaurora.org>
>>
>> SLIMbus (Serial Low Power Interchip Media Bus) is a specification
>> developed by MIPI (Mobile Industry Processor Interface) alliance.
>> SLIMbus is a 2-wire implementation, which is used to communicate with
>> peripheral components like audio. Commonly used digital audio
>> interfaces such as I2S, PCM are intended for point-to-point connection
>> between application processor and single audio device and support one
>> or two channels. Adding more channels or functions is difficult
>> without increasing number of bus structures and hence pin count.
>> In parallel to audio channels, control buses such as I2C are typically
>> used for low-bandwidth control tasks.
>> SLIMbus replaces many digital audio buses and control buses by
>> providing flexible and dynamic bus-bandwidth between data-functions
>> and control-functions.
>>
>> The framework supports message APIs, channel scheduling for SLIMbus.
>> Message APIs are used for status/control type of communication with a
>> device. Data Channel APIs are used for setting data channels between
>> SLIMbus devices.
>>
>> Framework supports multiple busses (1 controller per bus) and multiple
>> clients/slave devices per controller.
>
> This looks like another bus doing the same thing as SPI and I2C.
>
...
>
> I heard of another bus type at the recent Linaro conference which sounds
> like it's going to do yet again a similar thing.  So it sounds like we're
> heading for about four of these things.
>
> Is there any way to consolidate this before we end up with four ways of
> solving the same problem?
>

I agree and am certainly open to suggestions.  SPMI is another MIPI 
standard bus that is likely going to fall into the same category.

thanks,
Ken

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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