[PATCH 5/7] ARM: dts: Add nodes for missing omap4 interconnect target modules

[sre@kernel.org (Sebastian Reichel)]

Hi Peter,

On Wed, Oct 11, 2017 at 06:54:04PM +0300, Peter Ujfalusi wrote:
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> 
> On 09/30/2017 01:34 AM, Tony Lindgren wrote:
> > On omap4 we are missing dts nodes for several interconnect target
> > modules that we are idling on init. This currently works with the
> > legacy platform data still around.
> > 
> > To fix this, let's add the interconnect target modules so we can
> > idle the unused interconnect target module on init.
> > 
> > Also note that adding the interconnect target module node does not
> > necessarily mean that there is a driver available for the child IP
> > block, or that the child IP block is even functional.
> > 
> > In the SGX case, the PowerVR driver is closed source. And McASP on
> > omap4 has at least the TX path disabled and is not supported by the
> > davinci-mcasp driver.
> 
> RX path is disabled, TX is supposed to work.
> 
> ...
> 
> > +		target-module at 40128000 {
> > +			compatible = "ti,sysc-mcasp";
> > +			ti,hwmods = "mcasp";
> > +			reg = <0x40128004 0x4>;
> > +			reg-names = "sysc";
> > +			#address-cells = <1>;
> > +			#size-cells = <1>;
> > +			ranges = <0x00000000 0x40128000 0x1000>, /* MPU */
> > +				 <0x49028000 0x49028000 0x1000>; /* L3 */
> > +
> > +			/*
> > +			 * Child device unsupported by davinci-mcasp. At least
> > +			 * TX path is disabled for omap4, and only DIT mode
> 
> s/TX/RX
> 
> > +			 * works with no I2S. See also old Android kernel
> > +			 * omap-mcasp driver for more information.
> 
> I'll look at the schema of PandaBoard to see if I can route out the McASP
> lines to somewhere then I can add support for this revision to davinci-mcasp
> driver.

Not sure if this is helpful information:

Motorola Droid 4 is OMAP4430 based and has McASP lines routed
to the audio codec (either McASP or McBSP can be used). Codec
is a custom one, which is not yet supported mainline, but
patches are WIP (*):

https://lkml.org/lkml/2017/7/12/368

(*) My patches use McBSP instead of McASP, since McASP looked
mostly unsupported. Motorola's kernel uses McASP.

-- Sebastian
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