[PATCH v6 0/3] media: rockchip: add driver for the rockchip mipi csi-2 receiver

[Michael Riesch via B4 Relay <devnull+michael.riesch.collabora.com@kernel.org>]

Habidere,

This series adds support for the Rockchip MIPI CSI-2 Receiver that is
integrated into recent Rockchip SoCs, such as the RK3568 and the RK3588.

According to Rockchip, this core is NOT the Synopsys MIPI CSI-2 Host, but
it features a compatible register layout (thanks Chaoyi for the
clarification).

As pointed out by Frank, we should thus rename the driver and place it
under drivers/media/platform/synopsys to facilitate re-use of this code
for similar IP cores.

As has been discussed in [0], it would be beneficial to add support 
for the split mode (a feature of the Rockchip CSI-2 DPHY) before
integrating the MIPI CSI-2 Receiver into the respective SoC device tree
includes. However, we can readily add the DT binding and the driver
as I am positive they will not need to be changed significantly when this
feature is introduced.

This constitutes a small step towards mainline video capture and camera
support on the Rockchip RK3588.

Looking forward to your comments!

Signed-off-by: Michael Riesch <michael.riesch@collabora.com>

[0] https://lore.kernel.org/r/20240220-rk3568-vicap-v14-0-b38b6da0fc80@collabora.com

---
Changes in v6:
- renamed driver to dw-mipi-csi2rx (Sakari)
- fixed return value of v4l2_get_link_freq (this time, really) (Sakari)
- Link to v5: https://lore.kernel.org/r/20251114-rockchip-mipi-receiver-v5-0-45aa117f190a@collabora.com

Changes in v5:
- fixed indentation in struct platform_driver ... (Sakari)
- fixed return value in case v4l2_get_link_freq returns 0 (Sakari)
- switched from pm_runtime_put_sync() to pm_runtime_put() (Sakari)
- Link to v4: https://lore.kernel.org/r/20251114-rockchip-mipi-receiver-v4-0-a9c86fecd052@collabora.com

Changes in v4:
- moved driver to drivers/media/platform/synopsys and renamed it (Frank)
- addresse review comments by Sakari
- Link to v3: https://lore.kernel.org/r/20251114-rockchip-mipi-receiver-v3-0-16e83aa7f395@collabora.com

Changes in v3:
- rebased onto v6.19/recent media-committers/next
- Link to v2: https://lore.kernel.org/r/20251114-rockchip-mipi-receiver-v2-0-eb9b43377fc4@collabora.com

Changes in v2:
- dropped one R-b by Bryan, as there were two of them on the same patch
  (Krzysztof)
- Link to v1: https://lore.kernel.org/r/20251114-rockchip-mipi-receiver-v1-0-d13086e810dd@collabora.com

---
Michael Riesch (3):
      media: dt-bindings: add rockchip mipi csi-2 receiver
      media: synopsys: add driver for the designware mipi csi-2 receiver
      arm64: defconfig: enable designware mipi csi-2 receiver

 .../bindings/media/rockchip,rk3568-mipi-csi2.yaml  | 141 ++++
 MAINTAINERS                                        |   7 +
 arch/arm64/configs/defconfig                       |   1 +
 drivers/media/platform/synopsys/Kconfig            |   1 +
 drivers/media/platform/synopsys/Makefile           |   1 +
 .../media/platform/synopsys/dw-mipi-csi2/Kconfig   |  17 +
 .../media/platform/synopsys/dw-mipi-csi2/Makefile  |   2 +
 .../synopsys/dw-mipi-csi2/dw-mipi-csi2rx.c         | 737 +++++++++++++++++++++
 8 files changed, 907 insertions(+)
---
base-commit: dc6c52205bdaddf1dc259497a958402b35c01fe2
change-id: 20251114-rockchip-mipi-receiver-0baf244c9c8e

Best regards,
-- 
Michael Riesch <michael.riesch@collabora.com>