This series adds a device tree overlay that enables the VGA output on Apalis iMX6, which is driven from a parallel RGB interface passing through a non-programmable video DAC.
The video DAC is a simple resistor network gated by an active-low data-enable signal. For the bridge to work properly, this series also changes the following in the dt-bindings and simple-bridge driver: - dt-bindings: Add a new compatible for the bridge in the simple-bridge binding. This is necessary because the existing dumb-vga-dac compatible doesn't describe a data-enable signal polarity. - simple-bridge: Add the VGA bridge match-table entry and timings struct, setting the DRM_BUS_FLAG_DE_LOW flag for the bridge. This change depends on another patch, and should be applied after it: - https://lore.kernel.org/all/20261002-v1-simple-bridge-atomic-check-v1-1-ef5d8332b...@toradex.com/T/#u Adds the atomic_check function to the simple-bridge driver, which allows the data-enable bus flag to be propagated through the DRM pipeline. This is necessary for the VGA to work correctly on the Apalis iMX6. Signed-off-by: Leonardo Costa <[email protected]> --- Leonardo Costa (3): dt-bindings: display: bridge: simple: Add the Toradex Apalis iMX6 VGA DAC bridge drm/bridge: simple-bridge: Add Toradex RGB to VGA DAC bridge ARM: dts: imx6q-apalis: Add VGA overlay .../bindings/display/bridge/simple-bridge.yaml | 1 + arch/arm/boot/dts/nxp/imx/Makefile | 21 ++++++ .../boot/dts/nxp/imx/imx6q-apalis-eval-vga.dtso | 79 ++++++++++++++++++++++ drivers/gpu/drm/bridge/simple-bridge.c | 10 +++ 4 files changed, 111 insertions(+) --- base-commit: f5f84daefcd92d7a630066635ecea1433ed5eac7 change-id: 20260928-v1-apalis-imx6-enable-vga-5c7ba6b358fe Best regards, -- Leonardo Costa <[email protected]>
