From 9181b5bbdff2739efa196c204cb307cc3cab210a Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Tue, 18 Jul 2017 12:02:01 +0800 Subject: [PATCH] dt-bindings: display: sunxi: Improve endpoint ID scheme readability The explanation for the endpoint ID numbering scheme is convoluted and hard to understand. This patch aims to improve the readability of it by combining the existing two paragraphs, while also providing a diagram example, and how endpoints should be numbered based on that example. Signed-off-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard --- .../bindings/display/sunxi/sun4i-drm.txt | 36 ++++++++++++++----- 1 file changed, 27 insertions(+), 9 deletions(-) diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt index b83e6018041d..2ee6ff0ef98e 100644 --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt @@ -4,15 +4,33 @@ Allwinner A10 Display Pipeline The Allwinner A10 Display pipeline is composed of several components that are going to be documented below: -For the input port of all components up to the TCON in the display -pipeline, if there are multiple components, the local endpoint IDs -must correspond to the index of the upstream block. For example, if -the remote endpoint is Frontend 1, then the local endpoint ID must -be 1. - -Conversely, for the output ports of the same group, the remote endpoint -ID must be the index of the local hardware block. If the local backend -is backend 1, then the remote endpoint ID must be 1. +For all connections between components up to the TCONs in the display +pipeline, when there are multiple components of the same type at the +same depth, the local endpoint ID must be the same as the remote +component's index. For example, if the remote endpoint is Frontend 1, +then the local endpoint ID must be 1. + + Frontend 0 [0] ------- [0] Backend 0 [0] ------- [0] TCON 0 + [1] -- -- [1] [1] -- -- [1] + \ / \ / + X X + / \ / \ + [0] -- -- [0] [0] -- -- [0] + Frontend 1 [1] ------- [1] Backend 1 [1] ------- [1] TCON 1 + +For a two pipeline system such as the one depicted above, the lines +represent the connections between the components, while the numbers +within the square brackets corresponds to the ID of the local endpoint. + +The same rule also applies to DE 2.0 mixer-TCON connections: + + Mixer 0 [0] ----------- [0] TCON 0 + [1] ---- ---- [1] + \ / + X + / \ + [0] ---- ---- [0] + Mixer 1 [1] ----------- [1] TCON 1 HDMI Encoder ------------ -- 2.20.1