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

[Kenneth Heitke]

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@xxxxxxxxxxxxxx>
> >
> > 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

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