On Mon, Feb 15, 2016 at 06:30:59PM +0530, Archit Taneja wrote: > The DSI driver is currently unaware of how the DSI clock and data pins > are mapped to the logical lanes provided by the DSI controller. > > Use the generic 'lanes' DT binding provided for DSI lanes (used for DSI > in bindings/display/ti/ti,omap4-dss.txt) to get the desired mapping. > > The MSM DSI controller is restricted in terms of what all mappings > it can support. The lane polarity is fixed for all the lanes, the clock > lanes are fixed, and the data lanes can be swapped among each other only > for a few combinations. Apply these restrictions when we parse the DT > data. > > Cc: devicetree@xxxxxxxxxxxxxxx > Cc: Rob Herring <robh@xxxxxxxxxx> > Cc: Tomi Valkeinen <tomi.valkeinen@xxxxxx> > > Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx> > --- > .../devicetree/bindings/display/msm/dsi.txt | 26 +++- > drivers/gpu/drm/msm/dsi/dsi_host.c | 146 ++++++++++++++++++--- > 2 files changed, 149 insertions(+), 23 deletions(-) > > diff --git a/Documentation/devicetree/bindings/display/msm/dsi.txt b/Documentation/devicetree/bindings/display/msm/dsi.txt > index e7423be..f0d8b6f 100644 > --- a/Documentation/devicetree/bindings/display/msm/dsi.txt > +++ b/Documentation/devicetree/bindings/display/msm/dsi.txt > @@ -44,9 +44,28 @@ Optional properties: > - pinctrl-names: the pin control state names; should contain "default" > - pinctrl-0: the default pinctrl state (active) > - pinctrl-n: the "sleep" pinctrl state > -- port: DSI controller output port. This contains one endpoint subnode, with its > - remote-endpoint set to the phandle of the connected panel's endpoint. > - See Documentation/devicetree/bindings/graph.txt for device graph info. > +- port: DSI controller output port, containing one endpoint subnode. > + > + DSI Endpoint properties: > + - remote-endpoint: set to phandle of the connected panel's endpoint. > + See Documentation/devicetree/bindings/graph.txt for device graph info. > + - lanes: list of pin numbers for the DSI lanes: CLKp, CLKn, DATA0p, DATA0n, > + DATA1p, DATA1n, ... > + This provides a physical to logical mapping of the DSI lanes. The CLKp and > + CLKn pins have to be mapped to pins 0 and 1. For data lanes, there are only Then why describe the clk pins? > + a limited number of physical to logical mappings possible: > + > + "0123": Logic 0->Phys 0; Logic 1->Phys 1; Logic 2->Phys 2; Logic 3->Phys 3; > + "3012": Logic 3->Phys 0; Logic 0->Phys 1; Logic 1->Phys 2; Logic 2->Phys 3; > + "2301": Logic 2->Phys 0; Logic 3->Phys 1; Logic 0->Phys 2; Logic 1->Phys 3; > + "1230": Logic 1->Phys 0; Logic 2->Phys 1; Logic 3->Phys 2; Logic 0->Phys 3; > + "0321": Logic 0->Phys 0; Logic 3->Phys 1; Logic 2->Phys 2; Logic 1->Phys 3; > + "1032": Logic 1->Phys 0; Logic 0->Phys 1; Logic 3->Phys 2; Logic 2->Phys 3; > + "2103": Logic 2->Phys 0; Logic 1->Phys 1; Logic 0->Phys 2; Logic 3->Phys 3; > + "3210": Logic 3->Phys 0; Logic 2->Phys 1; Logic 1->Phys 2; Logic 0->Phys 3; > + > + Here, a "3012" mapping will be represented by: > + lanes = <0 1 8 9 2 3 4 5 6 7>; I'm lost here. What does 8 mean for example. The index represents? Rob -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
