Hello, This RFC patch series implements support for the Frame Compression Processor (FCP) modules found in the Renesas R-Car Gen3 SoCs. The FCP is a companion module for various video processing modules in the Gen3 family SoCs. It provides data compression and decompression, data caching and conversion of AXI transaction in order to reduce the memory bandwidth. In simpler terms it handles data memory accesses on behalf of a video processing module. In the simplest case the FCP is completely transparent to the video processing module for which it handles memory accesses, with one caveat: the FCP functional clock and power domain must be enabled whenever it has to handle a memory access. The approach taken in this series is to describe the FCPs in DT as device nodes with registers, clocks and power domains. They are referenced from the associated video processing module DT node. On the driver side, a new rcar-fcp driver handles registration of FCP instances as they are probed, and offers an API to video processing module drivers to lookup FCP instances and enable and disable them. The FCP driver currently doesn't access the FCP registers, is for the FCPV (FCP for VSP) instances no FCP parameter needs to be configured. Other FCP variants (FCP for FDP and possiblye FCP for Codec) will require software configuration which will be implemented later. This patch series enables FCPV support for the r8a7795 SoC. In order to provide enough context for review I've included patches that add FCP support in the VSP driver, as well as DT patches to enable VSP and DU. Only patches 1/9, 3/9 and 6/9 are relevant for the FCP. Patches 5/9 and 7/9 show how the FCP API is used in the VSP driver. Patches 2/9, 4/9, 8/9 and 9/9 are only needed to test FCP + VSP operation on r8a7795 and are otherwise out of scope for this RFC (reviews would of course still be appreciated). The series applies on top of two previously posted patch series for the vsp1 and rcar-du-drm drivers. For review and testing convenience I've pushed the result to git://linuxtv.org/pinchartl/media.git drm/du/vsp1-kms/boards Laurent Pinchart (9): clk: shmobile: r8a7795: Add FCP clocks clk: shmobile: r8a7795: Add LVDS module clock v4l: Add Renesas R-Car FCP driver v4l: vsp1: VSPD instances have no LUT on Gen3 v4l: vsp1: Add FCP support ARM64: renesas: r8a7795: Add FCPV nodes ARM64: renesas: r8a7795: Add VSP instances ARM64: renesas: r8a7795: Add DU device to DT ARM64: renesas: salvator-x: Enable DU .../devicetree/bindings/media/renesas,fcp.txt | 24 +++ .../devicetree/bindings/media/renesas,vsp1.txt | 5 + MAINTAINERS | 10 + arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts | 44 ++++ arch/arm64/boot/dts/renesas/r8a7795.dtsi | 237 +++++++++++++++++++++ drivers/clk/shmobile/r8a7795-cpg-mssr.c | 16 ++ drivers/media/platform/Kconfig | 14 ++ drivers/media/platform/Makefile | 1 + drivers/media/platform/rcar-fcp.c | 176 +++++++++++++++ drivers/media/platform/vsp1/vsp1.h | 2 + drivers/media/platform/vsp1/vsp1_drv.c | 26 ++- include/media/rcar-fcp.h | 34 +++ 12 files changed, 587 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/media/renesas,fcp.txt create mode 100644 drivers/media/platform/rcar-fcp.c create mode 100644 include/media/rcar-fcp.h -- Regards, Laurent Pinchart
