[PATCH v4 0/2] Basic support for TI TDP158

[Marc Gonzalez]

TDP158 is an AC-coupled DVI / HDMI to TMDS level shifting Redriver.

Like the TFP410, the TDP158 can be set up in 2 different ways:
1) hard-coding its configuration settings using pin-strapping resistors
2) placing it on an I2C bus, and defer set-up until run-time

The mode is selected by pin 8 = I2C_EN
I2C_EN = 1 ==> I2C Control Mode
I2C_EN = 0 ==> Pin Strap Mode

On our board, I2C_EN is pulled high (hard-wired).

---
Changes in v4:
- Rebase series on top of v6.11-rc1
- Add blurb about I2C vs pin strap mode in cover letter
- Add blurb about I2C vs pin strap mode in binding commit message
- Add blurb about I2C mode in driver commit message
- Add comment in binding explaining when reg is required
- Add comment in binding describing Operation Enable / Reset Pin
- Link to v3: https://lore.kernel.org/r/20240627-tdp158-v3-0-fb2fbc808346@freebox.fr

Changes in v3:
- Add 'select DRM_PANEL_BRIDGE' in driver Kconfig
- Fix checkpatch errors
- log errors using dev_err (so save dev pointer)
- expand a few error messages
- expand commit messages with info from the datasheet
- mark regulators as required in the DT binding
- Link to v2: https://lore.kernel.org/r/20240625-tdp158-v2-0-a3b344707fa7@freebox.fr

Changes in v2:
- Don't overload simple-bridge, spin new minimal driver
- New driver, new binding
- Default device settings work fine for us, so we don't tweak registers
- Link to v1: https://lore.kernel.org/r/20240617-tdp158-v1-0-df98ef7dec6d@freebox.fr

- Link to v0b: https://lore.kernel.org/r/b41f2f86-0d99-4199-92a9-42cbb9d6a6d5@freebox.fr/
- Link to v0a: https://lore.kernel.org/r/d3de652f-ce89-4f57-b900-07b11f8bf8f9@free.fr/

---
Marc Gonzalez (2):
      dt-bindings: display: bridge: add TI TDP158
      drm/bridge: add support for TI TDP158

 .../bindings/display/bridge/ti,tdp158.yaml         |  57 +++++++++++
 drivers/gpu/drm/bridge/Kconfig                     |   7 ++
 drivers/gpu/drm/bridge/Makefile                    |   1 +
 drivers/gpu/drm/bridge/ti-tdp158.c                 | 108 +++++++++++++++++++++
 4 files changed, 173 insertions(+)
---
base-commit: c6072668fcfb13295b600747dbd89f00da1a4ed9
change-id: 20240617-tdp158-418200d6cc0b

Best regards,
-- 
Marc Gonzalez <mgonzalez at freebox.fr>