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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 <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Chen-Yu Tsai 2017-07-18 12:02:01 +08:00 committed by Maxime Ripard
parent 9cbcbdbaff
commit 9181b5bbdf
1 changed files with 26 additions and 8 deletions
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34
Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
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@ -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.
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.
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.
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
------------