Add ITE IT6162 MIPI DSI to HDMI bridge driver

This patch series adds support for the ITE IT6162 MIPI DSI to HDMI
bridge chip. The IT6162 is an I2C-controlled bridge that receives MIPI
DSI input and outputs HDMI signals.

The device supports the following configurations:
  - Single MIPI DSI input: up to 4K @ 30Hz
  - Dual MIPI DSI input (combined): up to 4K @ 60Hz

This series introduces:
  - dt-bindings: Add YAML binding document for ITE IT6162
  - drm/bridge: Add ITE IT6162 MIPI DSI to HDMI bridge driver

Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
Changes in v4:
- Documentation/devicetree/bindings/display/bridge/ite,it6162.yaml:
  * Drop ite,support-hdcp
  * Drop endpoint properties already in video-interfaces.yaml
  * Fix data-lanes in example with <0 1 2 3>
  * Add blanking line in example before endpoint subnode starts
  * Add reset-gpio and power controls to required

- drivers/gpu/drm/bridge/ite-it6162.c:
  * Drop struc it6162_audio
  * Add HDCP_AUTO in enum hdcp_ver{}, FW enable HDCP by sink capability.
  * Call drm_atomic_helper_connector_hdmi_clear_audio_infoframe()
    in it6162_bridge_hdmi_audio_shutdown()
  * Drop it6162_bridge_hdmi_audio_startup()
  * Add hdmi_clear_hdmi_infoframe and hdmi_write_hdmi_infoframe
  * Drop it6162_parse_dt() due to "ite,support-hdcp" is removed from DT.
  * add DRM_BRIDGE_OP_HDMI to it6162->bridge.ops

- Link to v3: https://lore.kernel.org/r/20260313-upstream-6162-v3-0-849...

Changes in v3:
- Documentation/devicetree/bindings/display/bridge/ite,it6162.yaml:  
  * Fix lane-polarities: remove $ref redefinition, allow via video-interfaces.yaml
  * Improve ite,support-hdcp description to clarify FW-based HDCP behavior
  * Remove descriptions repeating schema constraints
  * Remove stray comment in ports required section
  * Fix data-lanes spacing in example: <1 2 3 4>
  * Add missing newline at end of file
  * Add missing change log  that Reviewed-by tag was removed when V1->V2

- drivers/gpu/drm/bridge/ite-it6162.c:
  * Fix OFFSET_VERSION_H register offset from 0x03 to 0x05
  * Add MIPI_PORT_EN_MASK macro combining MIPI_PORT1_EN_MASK and MIPI_PORT0_EN_MASK
  * Rename HDCP enums: NO_HDCP -> HDCP_DISABLE, NO_HDCP_STATE -> HDCP_STATE_IDLE,
    AUTH_DONE -> HDCP_STATE_AUTH_DONE, AUTH_FAIL -> HDCP_STATE_AUTH_FAIL
  * Rename it6162_infoblock_complete() to it6162_wait_command_complete()
  * Rename it6162_infoblock_host_set() to it6162_infoblock_trigger() 
  * Remove it6162_infoblock_mipi_config() and it6162_infoblock_write_msg()
    wrappers, inline into it6162_reset_init() and
    it6162_mipi_set_video_timing() respectively
  * Remove it6162_set_default_config() wrapper, inline into
    it6162_reset_init()  
  * Fix typo: hdcp_encyption -> hdcp_encryption
  * Fix typo: it6162_hdcp_read_infomation -> it6162_hdcp_read_information
  * Remove dev_err_probe() usage outside of probe path
  * Remove verbose success-path dev_info/dev_dbg logging throughout
  * Replace __func__ usage in error messages with descriptive strings
  * Fix double error printing in probe for it6162_init_pdata failure path
  * Fix uninitialized variable warning: initialize cp_status to
    DRM_MODE_CONTENT_PROTECTION_DESIRED at declaration; move
    drm_hdcp_update_content_protection() inside the state-change block
  * Fix audio sample width mapping: case 20 now maps to WORD_LENGTH_20BIT,
    case 24 to WORD_LENGTH_24BIT
  * Remove stray drm_dbg("it6162_bridge_atomic_disable") call
  * Remove drm_dbg() calls from it6162_display_mode_to_settings()
  * Drop unused struct it6162 * parameter from it6162_avi_to_video_setting()
    and it6162_display_mode_to_settings()
  * Fold it6162_set_default_config() body directly into it6162_reset_init(),
    removing the wrapper
  * it6162_infoblock_request_data(): split command complete polling and
    buffer status check into two steps; use wait_event_timeout() for
    data_buf_sts since it is updated asynchronously by the interrupt
    handler; add wait_queue_head_t data_buf_wait to struct it6162 and
    wake_up() in interrupt handler

- Link to v2: https://lore.kernel.org/r/20260309-upstream-6162-v2-0-deb...

Changes in v2:
- dt-bindings:
  * Drop Reviewed-by tag due to below changes
  * Add property "ite,spport-hdcp" to enable HDCP
  * Add property "lane-polarities" and "clock-noncontinuous" for DSI
    setting

- drm/bridge:
  * Drop unused element in struct it6162
  * Remove regmap wrappers
  * Use FIELD_PREP for bitfield operations
  * Update HDCP status with drm_hdcp_update_content_protection()
  * Add AVI, AUDIO, and SPD infoframe control
  * Remove conversion from drm_display_mode to videomode
  * Fix regulator/gpio error handling in it6162_init_pdata() to return proper error codes

- MAINTAINERS
  * squash to driver patch

- Link to v1: https://lore.kernel.org/r/20260223-upstream-6162-v1-0-ebc...

---
Hermes Wu (2):
      dt-bindings: display: bridge: Add ITE IT6162 MIPI DSI to HDMI bridge
      drm/bridge: Add ITE IT6162 MIPI DSI to HDMI bridge driver

 .../bindings/display/bridge/ite,it6162.yaml        |  169 ++
 MAINTAINERS                                        |    7 +
 drivers/gpu/drm/bridge/Kconfig                     |   17 +
 drivers/gpu/drm/bridge/Makefile                    |    1 +
 drivers/gpu/drm/bridge/ite-it6162.c                | 1628 ++++++++++++++++++++
 5 files changed, 1822 insertions(+)
---
base-commit: 2622649ad6cdbb3e77bfafc8c0fe686090b77f70
change-id: 20260223-upstream-6162-3751e78dfcad

Best regards,
-- 
Hermes Wu <Hermes.wu@ite.com.tw>