From: Archit Taneja Date: Thu, 25 Jun 2015 06:13:40 +0000 (+0530) Subject: drm/msm: dsi host: Use device graph parsing to parse connected panel X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f7009d266d8b2f4b54da42399aaa536d74fe3e7c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/msm: dsi host: Use device graph parsing to parse connected panel The dsi host looks for the connected panel node by parsing for a child named 'panel'. This hierarchy isn't very flexible. The connected panel is forced to be a child to the dsi host, and hence, a mipi dsi device. This isn't suitable for dsi devices that don't use mipi dsi as their control bus. Follow the of_graph approach of creating ports and endpoints to represent the connections between the dsi host and the panel connected to it. In our case, the dsi host will only have one output port, linked to the panel's input port. Update DT binding documentation with device graph usage info. v3: - Fix return value checks of of_graph_* calls. - Don't make port a mandatory DT property - Fix defer check when no panel node specified - Rename parse_dt func to align with other dsi_host funcs Reviewed-by: Hai Li Signed-off-by: Archit Taneja Signed-off-by: Rob Clark --- diff --git a/Documentation/devicetree/bindings/drm/msm/dsi.txt b/Documentation/devicetree/bindings/drm/msm/dsi.txt index 4309f0fc4dba..d56923cd5590 100644 --- a/Documentation/devicetree/bindings/drm/msm/dsi.txt +++ b/Documentation/devicetree/bindings/drm/msm/dsi.txt @@ -41,6 +41,9 @@ 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. DSI PHY: Required properties: @@ -113,6 +116,18 @@ Example: power-supply = <...>; backlight = <...>; + + port { + panel_in: endpoint { + remote-endpoint = <&dsi0_out>; + }; + }; + }; + + port { + dsi0_out: endpoint { + remote-endpoint = <&panel_in>; + }; }; }; diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index ef60aef6e03b..dc4d3e9d93c0 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include