From: Sunyun Yang <syyang@lontium.com>
The LT7911EXC is an I2C-controlled bridge that receives eDP1.4
and output mipi dsi. This series introduces:
- A device tree binding YAML file describing the hardware
- A new DRM bridge driver implementing the basic functionality
Signed-off-by: Sunyun Yang<syyang@lontium.com>
---
Change in v7:
- dt-binding:
1. fix commit message typos(Receiver、signal) [sashiko-bot]
2. remove the ambiguity caused by "signal/dual".
- drm/bridge:
1. using devm_regulator_get_enable avoids power leaks. [sashiko-bot]
2. set reset gpio is low after cutting off power in lt7911exc_remove function, avoid backpowering.
3. synchronous request_firmware() call cause a permanent probe failure if the driver is built-in,
probe executes before the root filesystem is mounted, which would cause this to fail with -ENOENT,
we have removed this functionality. Use trigger to upgrade.
4. add `depends on I2C` and `select REGMAP_I2C` in Kconfig.
5. add return value of `devm_drm_bridge_add()` in `probe()`.
6. add directly header files (linux/slab.h, linux/delay.h, linux/regulator/consumer.h)
- Link to v6: https://lore.kernel.org/lkml/20260508134702.4713-1-syyang@lontium.com/
Change in v6:
- dt-binding:
- drm/bridge:
1. use #define FW_FILE "Lontium/lt7911exc_fw.bin" to match linux-firmware
- Link to v5: https://lore.kernel.org/lkml/20260506013153.2240-1-syyang@lontium.com/
Change in v5:
- dt-binding:
- drm/bridge:
1. Change "mipi" to "mipi dsi" in the commit message. [Dmitry]
2. Change "eDP/MIPI" to "eDP/MIPI DSI" in Kconfig.
- Link to v4: https://lore.kernel.org/lkml/20260430094612.3408174-1-syyang@lontium.com/
Change in v4:
- dt-binding:
1. Fix the missing spaces on the "subject". [Krzysztof]
2. Fix the error descriptions for port@0 and port@1.
- drm/bridge:
- Link to v3: https://lore.kernel.org/lkml/20260429040541.3404116-1-syyang@lontium.com/
Change in v3:
- dt-binding:
- drm/bridge:
1. already submit lt7911exc_fw.bin to linux-firmware. [Dmitry]
2. remove lt7911exc_remove function.
3. drop the "lontium, " in lt7911exc_i2c_table.
- Link to v2: https://lore.kernel.org/lkml/20260428063224.3316655-1-syyang@lontium.com/
Change in v2:
- dt-binding:
1. reset pins use active low. [Dmitry]
- drm/bridge:
1. use atomic_* callbacks. [Quentin]
2. fix the incorrect formatting and spaces.
3. add the required header files. [Dmitry]
4. remove "enabled" flag.
5. remove *fw from the lt7911exc struct.
6. .max_register and .range_max use actual range.
7. regulator use bulk interface.
8. use dev_err_probe, devm_mutex_init and devm_drm_bridge_add.
9. Replace GPL v2 with GPL.
- Link to v1: https://lore.kernel.org/lkml/20260420023354.1192642-1-syyang@lontium.com/
---
Sunyun Yang (2):
dt-bindings: bridge: Add Lontium LT7911EXC eDP to MIPI DSI bridge
drm/bridge: Add Lontium LT7911EXC eDP to MIPI DSI bridge
.../display/bridge/lontium,lt7911exc.yaml | 89 +++
drivers/gpu/drm/bridge/Kconfig | 15 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/lontium-lt7911exc.c | 514 ++++++++++++++++++
4 files changed, 619 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt7911exc.yaml
create mode 100644 drivers/gpu/drm/bridge/lontium-lt7911exc.c
--
2.34.1