* What ist the standard way to define connector type and bus format with device tree?
@ 2021-01-12 11:41 H. Nikolaus Schaller
[not found] ` <F038EBE2-132E-4390-85E3-74AE9FB512A2@goldelico.com>
0 siblings, 1 reply; 2+ messages in thread
From: H. Nikolaus Schaller @ 2021-01-12 11:41 UTC (permalink / raw)
To: Sam Ravnborg, Thierry Reding
Cc: Paul Boddie, Linux Kernel Mailing List, ML dri-devel,
Discussions about the Letux Kernel
Hi,
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 and bus format which can only be
set by adding the same information to the panel-simple tables.
This leads to big problems because DRM can't match the
display with any lcd controller. The least issue is a
warning:
[ 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,
Nikolaus
^ permalink raw reply [flat|nested] 2+ messages in thread[parent not found: <F038EBE2-132E-4390-85E3-74AE9FB512A2@goldelico.com>]
* Q: What ist the standard way to define connector type and bus format with device tree? [not found] ` <F038EBE2-132E-4390-85E3-74AE9FB512A2@goldelico.com> @ 2021-02-28 21:10 ` H. Nikolaus Schaller 0 siblings, 0 replies; 2+ messages in thread From: H. Nikolaus Schaller @ 2021-02-28 21:10 UTC (permalink / raw) To: Sam Ravnborg, Thierry Reding, Laurent Pinchart Cc: Paul Boddie, Linux Kernel Mailing List, ML dri-devel, Discussions about the Letux Kernel 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, Nikolaus > Am 31.01.2021 um 11:54 schrieb H. Nikolaus Schaller <hns@goldelico.com>: > > ping? > >> Am 12.01.2021 um 12:41 schrieb H. Nikolaus Schaller <hns@goldelico.com>: >> >> Hi, >> 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 >> warning: >> >> [ 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, >> Nikolaus > ^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-01-12 11:41 What ist the standard way to define connector type and bus format with device tree? H. Nikolaus Schaller
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2021-02-28 21:10 ` Q: " H. Nikolaus Schaller
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