On 02/28/14 14:47, Philipp Zabel wrote:
Am Freitag, den 28.02.2014, 13:57 +0100 schrieb Sebastian Hesselbarth:
On 02/28/14 13:20, Tomi Valkeinen wrote:
This series is a re-send of
http://article.gmane.org/gmane.linux.drivers.devicetree/61739
...
Shortly about the display components in the series, in the order of probable
public interest:
* Analog TV, DVI and HDMI Connectors represent a respective connector on the
board. They don't do much, but they do mark the end of the video pipeline (from
the board's pov), and they should also in the future offer ways to handle
things like the +5V pin on DVI and HDMI connector and HPD pin.
* MIPI DPI panel and MIPI DSI CM panels represent bindings for simple panels
using the respective video bus.
* Sony acx565akm is an SPI controlled panel using flatlink video bus.
* TFP410 is a DPI to DVI encoder.
* TPD12S015 is a HDMI companion chip, used on OMAP boards.
Tomi,
Out of curiosity, will there be DT nodes for pull-up resistors soon,
too? ;)
Honestly, TPD12S015 is a level shifter, there is nothing in it that
would justify a DT node nor a driver.
Above you already note, that connector nodes should offer HPD in the
future, but I guess the binding should represent that now already.
I will be a DT stub anyway, the corresponding video sink driver will
have to look it up.
Looking through the bindings for DVI and HDMI, I guess HPD gpio is
better kept in those nodes. From the relevant (DT) properties DVI and
HDMI connectors are in no way different.
I like the idea of adding actual connector nodes to the board device
trees. A TV encoder driver for example could this way detect from the
device tree whether it is connected to a VGA, Composite, or S-Video
connector (or maybe to both Composite and S-Video connectors at the same
time).
I agree that different connectors help providing a better
user-experienced view of board layout. But I doubt that besides the
differentiation (HDMI, DVI, VGA, SVideo, ...) and the endpoint there
should be anything more in that node.
Sebastian
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