Hello, This patch series replaces the custom external encoders support implementation in the R-Car DU driver with code based on the DRM bridge API. While the overall diffstat isn't impressive, the rcar-du-drm driver gets notably thinner in the process: 9 files changed, 57 insertions(+), 374 deletions(-) This is offset by a reusable driver for LVDS encoders along with the corresponding DT bindings (+ 204 lines). Patches 1/9 and 2/9 add DT bindings for LVDS encoders with a corresponding driver. It supports "dumb" LVDS encoders only, similarly to the dumb-vga-dac driver. One notable difference, though, is that LVDS encoders can't be purely passive, and thus require at least one power supply (and usually multiple of them) and have a few control GPIOs (most notably to control reset, power down, clock polarity and/or LVDS slew rate). However, on many systems those encoders are integrated in such a way that the control pins are pulled up or down appropriately and the power supplies are either always on or shared with other display components that make them operate as if they were always on. For that reason a common drivers for those systems is useful, with simple DT bindings that don't try to cover any device-specific control pin or power supply. To ensure backward compatibility most LVDS encoders should *not* use the common simple "lvds-encoder" compatible string, but should instead define a device-specific compatible string that can then be added to the lvds-encoder driver (patch 4/9). This way, when the need to control pins or supplies will arise, a new driver can be developed matching on the device-specific compatible string, which will then be removed from the simple driver. Existing systems will migrate transparently without requiring a change to their device tree. A similar reasoning applies to VGA DACs, leading to the addition of the "adi,adv7123" compatible string to the dumb-vga-dac driver's OF match table in patch 3/9. Patch 5/9 adds a new type field to the drm_bridge structure to inform bridge users of the bridge type. This is useful for display driver to create a DRM encoder of the appropriate type without having to resort to heuristics. Patches 6/9 and 7/9 update all bridge drivers to initialize the new field to the appropriate value. Patches 8/9 and 9/9 finally migrate the rcar-du-drm driver to the DRM bridge API, removing the custom VGA DAC implementation in patch 8/9 and the table of bridge compatible strings used to find the encoder type in patch 9/9. Compared to v1, - The patches have been rebased on top of the "[PATCH v2 00/13] R-Car DU: Add support for LVDS mode selection" series. - The LVDS encoder DT bindings have been split from the LVDS encoder driver into a separate patch. - The wording of the DRM bridge documentation new property has been updated. Laurent Pinchart (9): drm: bridge: Add LVDS encoder DT bindings drm: bridge: Add LVDS encoder driver drm: bridge: vga-dac: Add adi,adv7123 compatible string drm: bridge: lvds-encoder: Add thine,thc63lvdm83d compatible string drm: Add encoder_type field to the drm_bridge structure drm: bridge: Set bridges' encoder type drm: Set on-chip bridges' encoder type drm: rcar-du: Replace manual bridge implementation with DRM bridge drm: rcar-du: Initialize encoder's type based on the bridge's type .../bindings/display/bridge/lvds-transmitter.txt | 64 +++++++ drivers/gpu/drm/bridge/Kconfig | 8 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 1 + drivers/gpu/drm/bridge/analogix-anx78xx.c | 1 + drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 1 + drivers/gpu/drm/bridge/dumb-vga-dac.c | 2 + drivers/gpu/drm/bridge/dw-hdmi.c | 2 + drivers/gpu/drm/bridge/lvds-encoder.c | 204 +++++++++++++++++++++ drivers/gpu/drm/bridge/nxp-ptn3460.c | 2 + drivers/gpu/drm/bridge/parade-ps8622.c | 2 + drivers/gpu/drm/bridge/sii902x.c | 2 + drivers/gpu/drm/bridge/tc358767.c | 2 + drivers/gpu/drm/exynos/exynos_drm_mic.c | 2 + drivers/gpu/drm/mediatek/mtk_hdmi.c | 2 + drivers/gpu/drm/rcar-du/Kconfig | 6 - drivers/gpu/drm/rcar-du/Makefile | 5 +- drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 103 ++++++----- drivers/gpu/drm/rcar-du/rcar_du_encoder.h | 3 - drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c | 137 -------------- drivers/gpu/drm/rcar-du/rcar_du_hdmienc.h | 35 ---- drivers/gpu/drm/rcar-du/rcar_du_kms.c | 37 +--- drivers/gpu/drm/rcar-du/rcar_du_vgacon.c | 82 --------- drivers/gpu/drm/rcar-du/rcar_du_vgacon.h | 23 --- drivers/gpu/drm/sti/sti_dvo.c | 2 + include/drm/drm_bridge.h | 8 + 26 files changed, 363 insertions(+), 374 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt create mode 100644 drivers/gpu/drm/bridge/lvds-encoder.c delete mode 100644 drivers/gpu/drm/rcar-du/rcar_du_hdmienc.c delete mode 100644 drivers/gpu/drm/rcar-du/rcar_du_hdmienc.h delete mode 100644 drivers/gpu/drm/rcar-du/rcar_du_vgacon.c delete mode 100644 drivers/gpu/drm/rcar-du/rcar_du_vgacon.h -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
