[Letux-kernel] Q: What ist the standard way to define connector type and bus format with device tree?
H. Nikolaus Schaller
hns at goldelico.com
Sun Feb 28 22:10:23 CET 2021
No expert available?
Let me refine the question:
By using the descriptions of panel-common.yaml and panel-timing.yaml it
is possible to define a simple-panel by pure DTS means.
This timing setup is done by code through:
git blame drivers/gpu/drm/panel/panel-simple.c | grep of_get_display_timing
4a1d0dbc8332231 (Sam Ravnborg 2020-02-16 19:15:13 +0100 431) ret = of_get_display_timing(np, "panel-timing", timing);
4a1d0dbc8332231 (Sam Ravnborg 2020-02-16 19:15:13 +0100 566) if (!of_get_display_timing(dev->of_node, "panel-timing", &dt))
But it seems to lack a mechanism to define the connector type and bus format
which is needed to make a panel finally work.
Are we missing something or is the code/property missing?
If it is the first, please let us know so that we can use it.
If code is missing, please let us know so that we can suggest a patch.
BR and thanks,
> Am 31.01.2021 um 11:54 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>> Am 12.01.2021 um 12:41 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>> according to bindings/display/panel/panel-common.yaml
>> and by using "panel-simple" as compatible string we
>> can define almost all properties of a DSI panel by a
>> device tree entry.
>> Except the connector type and bus format which can only be
>> set by adding the information to the panel-simple tables.
>> This leads to big problems because DRM can't match the
>> display with any lcd controller. A smaller issue is a
>> [ 0.313431] panel-simple claa070vc01: Specify missing connector_type
>> Are we missing some documentation or code that reads
>> some "connector-type" and "bus-format" property?
>> BR and thanks,
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