Re: [PATCH] dmaengine: usb-dmac: Document SoC specific bindings

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Hi Rob,

On Wed, Nov 25, 2015 at 09:20:32AM +0900, Simon Horman wrote:
> On Tue, Nov 24, 2015 at 02:16:55PM -0600, Rob Herring wrote:
> > On Tue, Nov 24, 2015 at 11:20:41AM +0900, Simon Horman wrote:
> > > In general Renesas hardware is not documented to the extent where the
> > > relationship between IP blocks on different SoCs can be assumed although
> > > they may appear to operate the same way. Furthermore the documentation
> > > typically does not specify a version for individual IP blocks. For these
> > > reasons a convention of using the SoC name in place of a version and
> > > providing SoC-specific compat strings has been adopted.
> > > 
> > > Although not universally liked this convention is used in the bindings for
> > > most drivers for Renesas hardware. The purpose of this patch is to
> > > update the Renesas USB DMA Controller driver to follow this convention.
> > > 
> > > Cc: devicetree@xxxxxxxxxxxxxxx
> > > Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > > Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
> > > 
> > > ---
> > > * r8a7792 (R-Car V2H) is omitted as my reading of the documentation
> > >   is that Renesas USB-DMAC does not exist on that SoC
> > > * r8a7795 (R-Car H2) is omitted as its unclear to me on the compatibility
> > >   of USB-DMAC that SoC
> > > 
> > > * Once this has been merged I intend to provide follow-up patches
> > >   to use these new compat strings in the relevant dtsi files.
> > > ---
> > >  Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt | 9 +++++++--
> > >  1 file changed, 7 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt b/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt
> > > index 040f365954cc..3bb624e10615 100644
> > > --- a/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt
> > > +++ b/Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt
> > > @@ -1,7 +1,12 @@
> > >  * Renesas USB DMA Controller Device Tree bindings
> > >  
> > >  Required Properties:
> > > -- compatible: must contain "renesas,usb-dmac"
> > > +- compatible: "renesas,usb-dmac-<soctype>", "renesas,usb-dmac" as fallback.
> > > +	      Examples with soctypes are:
> > > +		- "renesas,usb-dmac-r8a7790" (R-Car H2)
> > > +		- "renesas,usb-dmac-r8a7791" (R-Car M2-W)
> > > +		- "renesas,usb-dmac-r8a7793" (R-Car M2-N)
> > > +		- "renesas,usb-dmac-r8a7794" (R-Car E2)
> > 
> > Weren't you changing the order of SoC and block names on new bindings? 
> 
> Could you clarify what the desired order is?
> My intention is for these bindings to use the preferred order.

ping
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