v2 introduces two new patches that could be likely squashed in later to deprecate the g_mbus_config() operation in documentation and expand the newly introduced function documentation by popular demand. Will report again the use cases I'm trying to address here: ------------------------------------------------------------------------------ Quoting: https://patchwork.kernel.org/cover/10855919/ "The use case this series cover is the following one: the Gen-3 R-Car boards include an ADV748x HDMI/CVBS to CSI-2 converter connected to its CSI-2 receivers. The ADV748x chip has recently gained support for routing both HDMI and analogue video streams through its 4 lanes TXA transmitter, specifically to support the Ebisu board that has a single CSI-2 receiver, compared to all other Gen-3 board where the ADV748x TXes are connected to different CSI-2 receivers, and where analogue video is streamed out from the ADV748x single lane TXB transmitter. To properly support transmission of analogue video through TXA, the number of data lanes shall be dynamically reduced to 1, in order to comply with the MIPI CSI-2 minimum clock frequency requirements" During the discussion of the RFC, Dave reported another use case for media bus parameter negotiation on his platform: https://patchwork.kernel.org/patch/10855923/#22569149 Another possible use case is for parallel bus multiplexing, where multiple image sensor share the parallel bus lines and they get activated alternatively through an enable signal. While this might not be most clever design, it's often seen in the wild, and this operation allow receivers to re-configure their bus parameter in between streaming session. Hyun is now using this series to configure GMSL devices. ------------------------------------------------------------------------------ v1->v2: - Address Sakari's comment to use unsigned int in place of bools - Add two new patches to address documentation - Adjust rcar-csi2 patch as much as possible according to Niklas comments - Add Niklas's tags Jacopo Mondi (6): media: v4l2-subdv: Introduce get_mbus_config pad op media: v4l2-subdev: Deprecate g_mbus_config video op media: v4l2-subdev: Expand get_mbus_config doc media: i2c: adv748x: Adjust TXA data lanes number media: i2c: adv748x: Implement get_mbus_config media: rcar-csi2: Negotiate data lanes number drivers/media/i2c/adv748x/adv748x-core.c | 31 ++++++-- drivers/media/i2c/adv748x/adv748x-csi2.c | 15 ++++ drivers/media/i2c/adv748x/adv748x.h | 1 + drivers/media/platform/rcar-vin/rcar-csi2.c | 53 ++++++++++++- include/media/v4l2-subdev.h | 82 ++++++++++++++++++++- 5 files changed, 171 insertions(+), 11 deletions(-) -- 2.26.0
