[RFC v2 1/4] dt-bindings: drm/mediatek: Add Mediatek display subsystem dts binding
Philipp Zabel
p.zabel at pengutronix.de
Thu Oct 1 01:59:10 PDT 2015
Am Mittwoch, den 30.09.2015, 11:57 -0500 schrieb Rob Herring:
> On Wed, Sep 30, 2015 at 10:30 AM, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> > Am Freitag, den 18.09.2015, 15:33 -0500 schrieb Rob Herring:
> >> On Fri, Sep 18, 2015 at 11:11 AM, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> >> > From: CK Hu <ck.hu at mediatek.com>
> >> >
> >> > Add device tree binding documentation for the display subsystem in
> >> > Mediatek MT8173 SoCs.
> >> >
> >> > Signed-off-by: CK Hu <ck.hu at mediatek.com>
> >> > Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
> >> > ---
> >> > .../bindings/drm/mediatek/mediatek,disp.txt | 131 +++++++++++++++++++++
> >> > .../bindings/drm/mediatek/mediatek,dsi.txt | 29 +++++
> >> > 2 files changed, 160 insertions(+)
> >> > create mode 100644 Documentation/devicetree/bindings/drm/mediatek/mediatek,disp.txt
> >> > create mode 100644 Documentation/devicetree/bindings/drm/mediatek/mediatek,dsi.txt
> >> >
> >> > diff --git a/Documentation/devicetree/bindings/drm/mediatek/mediatek,disp.txt b/Documentation/devicetree/bindings/drm/mediatek/mediatek,disp.txt
> >> > new file mode 100644
> >> > index 0000000..a3811bd
> >> > --- /dev/null
> >> > +++ b/Documentation/devicetree/bindings/drm/mediatek/mediatek,disp.txt
> >> > @@ -0,0 +1,131 @@
> >> > +Mediatek display subsystem
> >> > +==========================
> >> > +
> >> > +The Mediatek display subsystem consists of various DISP function blocks in the
> >> > +MMSYS register space. The connections between them can be configured by output
> >> > +and input selectors in the MMSYS_CONFIG register space and register updates can
> >> > +be synchronized to video frame boundaries with help of a DISP_MUTEX function
> >> > +block.
> >> > +
> >> > +The display-subsystem node binds together all individual device nodes that
> >> > +comprise the DISP subsystem.
> >> > +
> >> > +Required properties:
> >> > +
> >> > +- compatible: "mediatek,<chip>-disp"
> >>
> >> > +- components: Should contain a list of phandles pointing to the DISP function
> >> > + block device nodes.
> >> > +- component-names: Should contain the name of the function block pointed to
> >> > + by the components phandle of the same index.
> >>
> >> NAK. Group these nodes under a parent node, use of-graph or just don't
> >> put this into DT. Don't invent a new way.
> >
> > If I connect the DISP nodes using of-graph bindings, the full graph will
> > look somewhat like this (including the currently unused function blocks,
> > all properties but ports and endpoints removed for brevity):
> >
> > ovl0 at 1400c000 {
> > port {
> > ovl0_to_color0: endpoint at 0 {
> > remote-endpoint = <&color0_from_ovl0>;
> > };
> >
> > ovl0_to_wdma0: endpoint at 1 {
> > remote-endpoint = <&wdma0_from_ovl0>;
> > };
> > };
> > };
> >
> > ovl1 at 1400d000 {
> > port {
> > ovl1_to_color1: endpoint at 0 {
> > remote-endpoint = <&color1_from_ovl1>;
> > };
> >
> > ovl1_to_wdma1: endpoint at 1 {
> > remote-endpoint = <&wdma1_from_ovl1>;
> > };
> > };
> > };
> >
> > rdma0 at 1400e000 {
> > port at 0 {
> > rdma0_from_od: endpoint {
> > remote-endpoint = <&od_to_rdma0>;
> > };
> > };
> >
> > port at 1 {
> > rdma0_to_ufoe: endpoint at 0 {
> > remote-endpoint = <&ufoe_from_rdma0>;
> > };
> >
> > rdma0_to_split0: endpoint at 1 {
> > remote-endpoint = <&split0_from_rdma0>;
> > };
> >
> > rdma0_to_color0: endpoint at 2 {
> > remote-endpoint = <&color0_from_rdma0>;
> > };
> > };
> > };
> >
> > rdma1 at 1400f000 {
> > port at 0 {
> > rdma1_from_gamma: endpoint {
> > remote-endpoint = <&gamma_to_rdma1>;
> > };
> > };
> >
> > port at 1 {
> > rdma1_to_dsi0: endpoint at 0 {
> > remote-endpoint = <&dsi0_from_rdma1>;
> > };
> >
> > rdma1_to_dsi1: endpoint at 1 {
> > remote-endpoint = <&dsi1_from_rdma1>;
> > };
> >
> > rdma1_to_dpi0: endpoint at 2 {
> > remote-endpoint = <&dpi0_from_rdma1>;
> > };
> >
> > rdma1_to_color1: endpoint at 3 {
> > remote-endpoint = <&color1_from_rdma1>;
> > };
> > };
> > };
> >
> > rdma2 at 14010000 {
> > port {
> > rdma2_to_dsi1: endpoint at 0 {
> > remote-endpoint = <&dsi1_from_rdma2>;
> > };
> >
> > rdma2_to_dpi0: endpoint at 1 {
> > remote-endpoint = <&dpi0_from_rdma2>;
> > };
> > };
> > };
> >
> > wdma0 at 14011000 {
> > port {
> > wdma0_from_ovl0: endpoint at 0 {
> > remote-endpoint = <&ovl0_to_wdma0>;
> > };
> >
> > wdma0_from_od: endpoint at 1 {
> > remote-endpoint = <&od_to_wdma0>;
> > };
> >
> > wdma0_from_ufoe: endpoint at 2 {
> > remote-endpoint = <&ufoe_to_wdma0>;
> > };
> > };
> > };
> >
> > wdma1 at 14012000 {
> > port {
> > wdma1_from_ovl1: endpoint at 0 {
> > remote-endpoint = <&ovl1_to_wdma1>;
> > };
> >
> > wdma1_from_gamma: endpoint at 1 {
> > remote-endpoint = <&gamma_to_wdma1>;
> > };
> > };
> > };
> >
> > color0 at 14013000 {
> > port at 0 {
> > color0_from_rdma0: endpoint at 0 {
> > remote-endpoint = <&rdma0_to_color0>;
> > };
> >
> > color0_from_ovl0: endpoint at 1 {
> > remote-endpoint = <&ovl0_to_color0>;
> > };
> > };
> >
> > port at 1 {
> > color0_to_aal: endpoint at 0 {
> > remote-endpoint = <&aal_from_color0>;
> > };
> >
> > color0_to_merge: endpoint at 1 {
> > remote-endpoint = <&merge_from_color0>;
> > };
> > };
> > };
> >
> > color1 at 14014000 {
> > port at 0 {
> > color1_from_rdma1: endpoint at 0 {
> > remote-endpoint = <&rdma1_to_color1>;
> > };
> >
> > color1_from_ovl1: endpoint at 1 {
> > remote-endpoint = <&ovl1_to_color1>;
> > };
> > };
> >
> > port at 1 {
> > color1_to_gamma: endpoint at 0 {
> > remote-endpoint = <&gamma_from_color1>;
> > };
> >
> > color1_to_merge: endpoint at 1 {
> > remote-endpoint = <&merge_from_color1>;
> > };
> > };
> > };
> >
> > aal at 14015000 {
> > port at 0 {
> > aal_from_color0: endpoint at 0 {
> > remote-endpoint = <&color0_to_aal>;
> > };
> >
> > aal_from_merge: endpoint at 1 {
> > remote-endpoint = <&merge_to_aal>;
> > };
> > };
> >
> > port at 1 {
> > aal_to_od: endpoint {
> > remote-endpoint = <&od_from_aal>;
> > };
> > };
> > };
> >
> > gamma at 14016000 {
> > port at 0 {
> > gamma_from_color1: endpoint {
> > remote-endpoint = <&color1_to_gamma>;
> > };
> > };
> >
> > port at 1 {
> > gamma_to_rdma1: endpoint at 0 {
> > remote-endpoint = <&rdma1_from_gamma>;
> > };
> >
> > gamma_to_dsi0: endpoint at 1 {
> > remote-endpoint = <&dsi0_from_gamma>;
> > };
> >
> > gamma_to_dsi1: endpoint at 2 {
> > remote-endpoint = <&dsi1_from_gamma>;
> > };
> >
> > gamma_to_dpi0: endpoint at 3 {
> > remote-endpoint = <&dpi0_from_gamma>;
> > };
> >
> > gamma_to_wdma1: endpoint at 4 {
> > remote-endpoint = <&wdma1_from_gamma>;
> > };
> > };
> > };
> >
> > merge at 14017000 {
> > port at 0 {
> > merge_from_color0: endpoint {
> > remote-endpoint = <&color0_to_merge>;
> > };
> > };
> >
> > port at 1 {
> > merge_from_color1: endpoint {
> > remote-endpoint = <&color1_to_merge>;
> > };
> > };
> >
> > port at 2 {
> > merge_to_aal: endpoint {
> > remote-endpoint = <&aal_from_merge>;
> > };
> > };
> > };
> >
> > split0 at 14018000 {
> > port at 0 {
> > split0_from_rdma0: endpoint at 0 {
> > remote-endpoint = <&rdma0_to_split0>;
> > };
> >
> > split0_from_od: endpoint at 1 {
> > remote-endpoint = <&od_to_split0>;
> > };
> > };
> >
> > port at 1 {
> > split0_to_ufoe: endpoint {
> > remote-endpoint = <&ufoe_from_split0>;
> > };
> > };
> >
> > port at 2 {
> > split0_to_dsi0: endpoint at 0 {
> > remote-endpoint = <&dsi0_from_split0>;
> > };
> >
> > split0_to_dsi1: endpoint at 1 {
> > remote-endpoint = <&dsi1_from_split0>;
> > };
> >
> > split0_to_dpi0: endpoint at 2 {
> > remote-endpoint = <&dpi0_from_split0>;
> > };
> > };
> > };
> >
> > split1 at 14019000 {
> > port at 0 {
> > split1_from_ufoe: endpoint {
> > remote-endpoint = <&ufoe_to_split1>;
> > };
> > };
> >
> > port at 1 {
> > split1_to_dsi0: endpoint {
> > remote-endpoint = <&dsi0_from_split1>;
> > };
> > };
> >
> > port at 2 {
> > split1_to_dsi1: endpoint {
> > remote-endpoint = <&dsi1_from_split1>;
> > };
> > };
> > };
> >
> > ufoe at 1401a000 {
> > port at 0 {
> > ufoe_from_rdma0: endpoint at 0 {
> > remote-endpoint = <&rdma0_to_ufoe>;
> > };
> >
> > ufoe_from_od: endpoint at 1 {
> > remote-endpoint = <&od_to_ufoe>;
> > };
> >
> > ufoe_from_split0: endpoint at 2 {
> > remote-endpoint = <&split0_to_ufoe>;
> > };
> > };
> >
> > port at 1 {
> > ufoe_to_dsi0: endpoint at 0 {
> > remote-endpoint = <&dsi0_from_ufoe>;
> > };
> >
> > ufoe_to_split1: endpoint at 1 {
> > remote-endpoint = <&split1_from_ufoe>;
> > };
> >
> > ufoe_to_dpi0: endpoint at 2 {
> > remote-endpoint = <&dpi0_from_ufoe>;
> > };
> >
> > ufoe_to_wdma0: endpoint at 3 {
> > remote-endpoint = <&wdma0_from_ufoe>;
> > };
> >
> > ufoe_to_dsi1: endpoint at 4 {
> > remote-endpoint = <&dsi1_from_ufoe>;
> > };
> > };
> > };
> >
> > dsi0: dsi0 at 1401b000 {
> > port at 0 {
> > dsi0_from_ufoe: endpoint at 0 {
> > remote-endpoint = <&ufoe_to_dsi0>;
> > };
> >
> > dsi0_from_split1: endpoint at 1 {
> > remote-endpoint = <&split1_to_dsi0>;
> > };
> >
> > dsi0_from_rdma1: endpoint at 2 {
> > remote-endpoint = <&rdma1_to_dsi0>;
> > };
> >
> > dsi0_from_gamma: endpoint at 3 {
> > remote-endpoint = <&gamma_to_dsi0>;
> > };
> >
> > dsi0_from_split0: endpoint at 4 {
> > remote-endpoint = <&split0_to_dsi0>;
> > };
> > };
> > };
> >
> > dsi1: dsi1 at 1401c000 {
> > port at 0 {
> > dsi1_from_split1: endpoint at 0 {
> > remote-endpoint = <&split1_to_dsi1>;
> > };
> >
> > dsi1_from_rdma1: endpoint at 1 {
> > remote-endpoint = <&rdma1_to_dsi1>;
> > };
> >
> > dsi1_from_gamma: endpoint at 2 {
> > remote-endpoint = <&gamma_to_dsi1>;
> > };
> >
> > dsi1_from_split0: endpoint at 3 {
> > remote-endpoint = <&split0_to_dsi1>;
> > };
> >
> > dsi1_from_rdma2: endpoint at 4 {
> > remote-endpoint = <&rdma2_to_dsi1>;
> > };
> >
> > dsi1_from_ufoe: endpoint at 5 {
> > remote-endpoint = <&ufoe_to_dsi1>;
> > };
> > };
> > };
> >
> > dpi0: dpi0 at 1401d000 {
> > port at 0 {
> > dpi0_from_ufoe: endpoint at 0 {
> > remote-endpoint = <&ufoe_to_dpi0>;
> > };
> >
> > dpi0_from_rdma1: endpoint at 1 {
> > remote-endpoint = <&rdma1_to_dpi0>;
> > };
> >
> > dpi0_from_gamma: endpoint at 2 {
> > remote-endpoint = <&gamma_to_dpi0>;
> > };
> >
> > dpi0_from_split0: endpoint at 3 {
> > remote-endpoint = <&split0_to_dpi0>;
> > };
> >
> > dpi0_from_rdma2: endpoint at 4 {
> > remote-endpoint = <&rdma2_to_dpi0>;
> > };
> > };
> > };
> >
> > od at 14023000 {
> > port at 0 {
> > od_from_aal: endpoint {
> > remote-endpoint = <&aal_to_od>;
> > };
> > };
> >
> > port at 1 {
> > od_to_rdma0: endpoint at 0 {
> > remote-endpoint = <&rdma0_from_od>;
> > };
> >
> > od_to_ufoe: endpoint at 1 {
> > remote-endpoint = <&ufoe_from_od>;
> > };
> >
> > od_to_split0: endpoint at 2 {
> > remote-endpoint = <&split0_from_od>;
> > };
> >
> > od_to_wdma0: endpoint at 3 {
> > remote-endpoint = <&wdma0_from_od>;
> > };
> > };
> > };
> >
> > Adding the graph to the mediatek oak-rev3 device tree increases the size
> > from currently 33 KiB to 41.5 KiB.
> > As a proponent of the of-graph bindings I certainly like to describe the
> > hardware connections using DT, but I'm not sure if maybe this is a bit
> > verbose.
>
> We need a graph visualizer...
Yes :)
> I think there has to be a balance with how much is put into the DT. If
> the relationship between blocks is pretty fixed then it doesn't really
> help much to put all this into DT. If every SOC or board can have
> differing combinations of blocks or connections between blocks then
> the graph makes sense.
I expect the graph to be constant for a given SoC like MT8173.
regards
Philipp
More information about the dri-devel
mailing list