Merge /home/v4l/v4l/patchwork

Merge /home/v4l/v4l/patchwork

* /home/v4l/v4l/patchwork: (76 commits)
  [media] cxd2820r: silence compiler warning
  [media] media: s5p-hdmi: add HPD GPIO to platform data
  [media] s5p-mfc: Set vfl_dir for encoder
  [media] s5p-mfc: Update MFC v4l2 driver to support MFC6.x
  [media] s5p-mfc: MFCv6 register definitions
  [media] s5p-mfc: Add MFC variant data to device context
  [media] s5p-mfc: Update MFCv5 driver for callback based architecture
  [media] s5p-mfc: Prepare driver for callback based re-architecture
  [media] v4l: Add control definitions for new H264 encoder features
  [media] v4l: Add fourcc definitions for new formats
  [media] s5p-csis: Allow to specify pixel clock's source through platform data
  [media] s5p-fimc: Remove unused platform data structure fields
  [media] s5p-csis: Replace phy_enable platform data callback with direct call
  [media] ARM: EXYNOS: Change MIPI-CSIS device regulator supply names
  [media] s5p-csis: Change regulator supply names
  [media] ARM: samsung: Change __s5p_mipi_phy_control() function signature
  [media] ARM: samsung: Remove unused fields from FIMC and CSIS platform data
  [media] DocBook: various updates w.r.t. v4l2_buffer and multiplanar
  [media] v4l2-ioctl.c: handle PREPARE_BUF like QUERYBUF
  [media] videobuf2-core: fill in length field for multiplanar buffers
  ...