[PATCH v2 1/2] dt-bindings: drm/msm/a6xx: Document interconnect properties for GPU

[Rob Herring]

On Tue, Dec 18, 2018 at 12:07 PM Jordan Crouse <jcrouse at codeaurora.org> wrote:
>
> On Tue, Dec 18, 2018 at 11:22:01AM -0600, Rob Herring wrote:
> > On Fri, Dec 14, 2018 at 03:16:39PM -0700, Jordan Crouse wrote:
> > > Add documentation for the interconnect and interconnect-names bindings
> > > for the GPU node as detailed by bindings/interconnect/interconnect.txt.
> > >
> > > Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
> > > ---
> > >  Documentation/devicetree/bindings/display/msm/gpu.txt | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/msm/gpu.txt b/Documentation/devicetree/bindings/display/msm/gpu.txt
> > > index 8d9415180c22..19b5ae459fdb 100644
> > > --- a/Documentation/devicetree/bindings/display/msm/gpu.txt
> > > +++ b/Documentation/devicetree/bindings/display/msm/gpu.txt
> > > @@ -19,6 +19,9 @@ Required properties:
> > >    * "mem_iface"
> > >  - iommus: optional phandle to an adreno iommu instance
> > >  - operating-points-v2: optional phandle to the OPP operating points
> > > +- interconnect: optional phandle to a interconnect provider.  See
> > > +  ../interconnect/interconnect.txt for details.
> > > +- interconnect-names: Name string for the interconnects.
> > >  - qcom,gmu: For a6xx and newer targets a phandle to the GMU device that will
> > >    control the power for the GPU
> > >
> > > @@ -68,6 +71,9 @@ Example a6xx (with GMU):
> > >
> > >             operating-points-v2 = <&gpu_opp_table>;
> > >
> > > +           interconnects = <&rsc_hlos MASTER_GFX3D &rsc_hlos SLAVE_EBI1>;
> > > +           interconnect-names = "gfx-mem";
> >
> > There's not really any point to having *-names when there is only 1
> > value.
>
> For the moment we can only look up the path from the DT by name. I guess we
> could add an lookup by index but I'm not sure if that had already been
> considered and rejected.

You don't have to support lookup by index, just support a NULL name.

Rob