| Message ID | 20200412182012.27515-4-sam@ravnborg.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dt-bindings: DT Schema variants of atmel lcdc, hlcdc | expand |
On Sun, Apr 12, 2020 at 08:20:11PM +0200, Sam Ravnborg wrote: > The wiring property is used to describe the wiring between > the connector and the panel. The property can be used when the > wiring is used to change the mode from for example > BGR to RGB. The first users are the at91sam9 family where > such a wiring trick is sometimes used. > The possilbe values are so far limited to what is required > by the at91sam9 family, but using "text" allows us to extend > this in the future. > > There exists similar properties today: > - display/tilcdc/tilcdc.txt: blue-and-red-wiring > - display/atmel,lcdc.txt: atmel,lcd-wiring-mode > > Neither of the above are defined as endpoint properties. > > The new property "wiring" has a more general name and > is defined as an endpoint property. > It will replace atmel,lcd-wiring-mode and may replace > blue-and-red-wiring. > > Signed-off-by: Sam Ravnborg <sam@ravnborg.org> > Cc: Mauro Carvalho Chehab <mchehab@kernel.org> > Cc: Rob Herring <robh@kernel.org> > Cc: Hans Verkuil <hverkuil@xs4all.nl> > Cc: linux-media@vger.kernel.org > --- > Documentation/devicetree/bindings/media/video-interfaces.txt | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt > index f884ada0bffc..c3bb87c5c9a9 100644 > --- a/Documentation/devicetree/bindings/media/video-interfaces.txt > +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt > @@ -141,6 +141,9 @@ Optional endpoint properties > - link-frequencies: Allowed data bus frequencies. For MIPI CSI-2, for > instance, this is the actual frequency of the bus, not bits per clock per > lane value. An array of 64-bit unsigned integers. > +- wiring: Wiring of data lines to display. > + "straight" - normal wiring. Don't really need a property to express this... > + "red-blue-reversed" - red and blue lines reversed. For a common property, I think this needs to be looked at in terms of formats and some of the format negotiation work Boris was doing. Rob
Hi Rob. On Tue, Apr 14, 2020 at 02:40:54PM -0500, Rob Herring wrote: > On Sun, Apr 12, 2020 at 08:20:11PM +0200, Sam Ravnborg wrote: > > The wiring property is used to describe the wiring between > > the connector and the panel. The property can be used when the > > wiring is used to change the mode from for example > > BGR to RGB. The first users are the at91sam9 family where > > such a wiring trick is sometimes used. > > The possilbe values are so far limited to what is required > > by the at91sam9 family, but using "text" allows us to extend > > this in the future. > > > > There exists similar properties today: > > - display/tilcdc/tilcdc.txt: blue-and-red-wiring > > - display/atmel,lcdc.txt: atmel,lcd-wiring-mode > > > > Neither of the above are defined as endpoint properties. > > > > The new property "wiring" has a more general name and > > is defined as an endpoint property. > > It will replace atmel,lcd-wiring-mode and may replace > > blue-and-red-wiring. > > > > Signed-off-by: Sam Ravnborg <sam@ravnborg.org> > > Cc: Mauro Carvalho Chehab <mchehab@kernel.org> > > Cc: Rob Herring <robh@kernel.org> > > Cc: Hans Verkuil <hverkuil@xs4all.nl> > > Cc: linux-media@vger.kernel.org > > --- > > Documentation/devicetree/bindings/media/video-interfaces.txt | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt > > index f884ada0bffc..c3bb87c5c9a9 100644 > > --- a/Documentation/devicetree/bindings/media/video-interfaces.txt > > +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt > > @@ -141,6 +141,9 @@ Optional endpoint properties > > - link-frequencies: Allowed data bus frequencies. For MIPI CSI-2, for > > instance, this is the actual frequency of the bus, not bits per clock per > > lane value. An array of 64-bit unsigned integers. > > +- wiring: Wiring of data lines to display. > > + "straight" - normal wiring. > > Don't really need a property to express this... > > > + "red-blue-reversed" - red and blue lines reversed. > > For a common property, I think this needs to be looked at in terms of > formats and some of the format negotiation work Boris was doing. OK, I will bite the bullet and try to understand this good enough to come up with a proposal. I will delay the conversion a bit, but we are in no hurry. Sam
diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt index f884ada0bffc..c3bb87c5c9a9 100644 --- a/Documentation/devicetree/bindings/media/video-interfaces.txt +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt @@ -141,6 +141,9 @@ Optional endpoint properties - link-frequencies: Allowed data bus frequencies. For MIPI CSI-2, for instance, this is the actual frequency of the bus, not bits per clock per lane value. An array of 64-bit unsigned integers. +- wiring: Wiring of data lines to display. + "straight" - normal wiring. + "red-blue-reversed" - red and blue lines reversed. - lane-polarities: an array of polarities of the lanes starting from the clock lane and followed by the data lanes in the same order as in data-lanes. Valid values are 0 (normal) and 1 (inverted). The length of the array
The wiring property is used to describe the wiring between the connector and the panel. The property can be used when the wiring is used to change the mode from for example BGR to RGB. The first users are the at91sam9 family where such a wiring trick is sometimes used. The possilbe values are so far limited to what is required by the at91sam9 family, but using "text" allows us to extend this in the future. There exists similar properties today: - display/tilcdc/tilcdc.txt: blue-and-red-wiring - display/atmel,lcdc.txt: atmel,lcd-wiring-mode Neither of the above are defined as endpoint properties. The new property "wiring" has a more general name and is defined as an endpoint property. It will replace atmel,lcd-wiring-mode and may replace blue-and-red-wiring. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Rob Herring <robh@kernel.org> Cc: Hans Verkuil <hverkuil@xs4all.nl> Cc: linux-media@vger.kernel.org --- Documentation/devicetree/bindings/media/video-interfaces.txt | 3 +++ 1 file changed, 3 insertions(+)