From 3efc2fa3b777e65e344a7612d38a8278e78a0514 Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Wed, 24 Aug 2016 08:46:37 +0300 Subject: 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 Acked-by: Rob Herring Tested-by: Philipp Zabel Signed-off-by: Philipp Zabel --- Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'Documentation/devicetree/bindings/display/bridge') 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: -- cgit v1.2.3