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| author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2016-08-24 08:46:37 +0300 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2016-09-19 08:07:24 +0200 |
| commit | 3efc2fa3b777e65e344a7612d38a8278e78a0514 (patch) | |
| tree | 2ebd3d55285160f4e724cb2a8cfd46eeeb6b7896 /Documentation/devicetree | |
| parent | 9f04a1f2b389a656486c1f9f918a3305569fba6a (diff) | |
| download | linux-stable-3efc2fa3b777e65e344a7612d38a8278e78a0514.tar.gz linux-stable-3efc2fa3b777e65e344a7612d38a8278e78a0514.tar.bz2 linux-stable-3efc2fa3b777e65e344a7612d38a8278e78a0514.zip | |
drm: bridge/dw_hdmi: add dw hdmi i2c bus adapter support
The change adds support of internal HDMI I2C master controller, this
subdevice is used by default, if "ddc-i2c-bus" DT property is omitted.
The main purpose of this functionality is to support reading EDID from
an HDMI monitor on boards, which don't have an I2C bus connected to
DDC pins.
The current implementation does not support "I2C Master Interface
Extended Read Mode" to read data addressed by non-zero segment
pointer, this means that if EDID has more than 1 extension blocks,
EDID reading operation won't succeed, in my practice all tested HDMI
monitors have at maximum one extension block.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt b/Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt index dc1452f0d5d8..5e9a84d6e5f1 100644 --- a/Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt +++ b/Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt @@ -19,7 +19,9 @@ Required properties: Optional properties - reg-io-width: the width of the reg:1,4, default set to 1 if not present -- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing +- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing, + if the property is omitted, a functionally reduced I2C bus + controller on DW HDMI is probed - clocks, clock-names: phandle to the HDMI CEC clock, name should be "cec" Example: |