[00/18] Add perf support to the rockchip-dfi driver

This series adds perf support to the Rockchip DFI driver.

The DFI is a unit for measuring DRAM performance. Its driver is
currently located under drivers/devfreq/event/ as it serves as an event
driver for DRAM frequency scaling. With this series it can also be used
as a perf driver for measuring DRAM throughput. Usage looks like:

perf stat -a -e rockchip_ddr/cycles/,\
                rockchip_ddr/read-bytes/,\
                rockchip_ddr/write-bytes/,\
                rockchip_ddr/bytes/ sleep 1

 Performance counter stats for 'system wide':

        1582524826      rockchip_ddr/cycles/
           1802.25 MB   rockchip_ddr/read-bytes/
           1793.72 MB   rockchip_ddr/write-bytes/
           3595.90 MB   rockchip_ddr/bytes/

       1.014369709 seconds time elapsed

My target SoC is RK3568 which is not yet supported by the driver, so the
series starts with some cleanups and preparations, then RK3568 support
is added and finally perf support.

The driver is tested on both a RK3568 board and a RK3399 board, the
latter with dual channel memory. The measured values look sane,
read-bytes plus write-bytes is equal to totally transferred bytes, the
values reported by perf are slightly higher than the values my copy
from/to RAM test tool reports, as expected.

Sascha

Sascha Hauer (18):
  PM / devfreq: rockchip-dfi: Embed desc into private data struct
  PM / devfreq: rockchip-dfi: use consistent name for private data
    struct
  PM / devfreq: rockchip-dfi: Make pmu regmap mandatory
  PM / devfreq: rockchip-dfi: Add SoC specific init function
  PM / devfreq: rockchip-dfi: dfi store raw values in counter struct
  PM / devfreq: rockchip-dfi: Use free running counter
  PM / devfreq: rockchip-dfi: introduce channel mask
  PM / devfreq: rk3399_dmc,dfi: generalize DDRTYPE defines
  PM / devfreq: rockchip-dfi: Clean up DDR type register defines
  PM / devfreq: rockchip-dfi: Add RK3568 support
  PM / devfreq: rockchip-dfi: Handle LPDDR2 correctly
  PM / devfreq: rockchip-dfi: Handle LPDDR4X
  PM / devfreq: rockchip-dfi: Pass private data struct to internal
    functions
  PM / devfreq: rockchip-dfi: Prepare for multiple users
  PM / devfreq: rockchip-dfi: Add perf support
  arm64: dts: rockchip: rk3399: Enable DFI
  arm64: dts: rockchip: rk356x: Add DFI
  dt-bindings: devfreq: event: convert Rockchip DFI binding to yaml

 .../bindings/devfreq/event/rockchip-dfi.txt   |  18 -
 .../bindings/devfreq/event/rockchip-dfi.yaml  |  38 +
 arch/arm64/boot/dts/rockchip/rk3399.dtsi      |   1 -
 arch/arm64/boot/dts/rockchip/rk356x.dtsi      |   6 +
 drivers/devfreq/event/rockchip-dfi.c          | 659 +++++++++++++++---
 drivers/devfreq/rk3399_dmc.c                  |  10 +-
 include/soc/rockchip/rk3399_grf.h             |   9 +-
 include/soc/rockchip/rk3568_grf.h             |  13 +
 include/soc/rockchip/rockchip_grf.h           |  16 +
 9 files changed, 638 insertions(+), 132 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt
 create mode 100644 Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.yaml
 create mode 100644 include/soc/rockchip/rk3568_grf.h
 create mode 100644 include/soc/rockchip/rockchip_grf.h