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[v3,0/7] usb: dwc3: Calculate REFCLKPER et. al. from reference clock

Message ID 20220127200636.1456175-1-sean.anderson@seco.com
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Series usb: dwc3: Calculate REFCLKPER et. al. from reference clock | expand

Message

Sean Anderson Jan. 27, 2022, 8:06 p.m. UTC 
This is a rework of patches 3-5 of [1]. It attempts to correctly program
REFCLKPER and REFCLK_FLADJ based on the reference clock frequency. Since
we no longer need a special property duplicating this configuration,
snps,ref-clock-period-ns is deprecated.

Please test this! Patches 3/4 in this series have the effect of
programming REFCLKPER and REFCLK_FLADJ on boards which already configure
the "ref" clock. I have build tested, but not much else.

[1] https://lore.kernel.org/linux-usb/20220114044230.2677283-1-robert.hancock@calian.com/

Changes in v3:
- Define each variable on its own line
- Rebase onto linux/master
- Update comment to notes some things mentioned during review

Changes in v2:
- Add snps,ref-clock-frequency-hz property for ACPI
- Also program GFLADJ.240MHZDECR
- Document clock members
- Don't program GFLADJ if the version is < 2.50a

Sean Anderson (7):
  dt-bindings: usb: dwc3: Deprecate snps,ref-clock-period-ns
  usb: dwc3: Get clocks individually
  usb: dwc3: Calculate REFCLKPER based on reference clock
  usb: dwc3: Program GFLADJ
  usb: dwc3: Add snps,ref-clock-frequency-hz property for ACPI
  arm64: dts: zynqmp: Move USB clocks to dwc3 node
  arm64: dts: ipq6018: Use reference clock to set dwc3 period

 .../devicetree/bindings/usb/snps,dwc3.yaml    |   7 +-
 arch/arm64/boot/dts/qcom/ipq6018.dtsi         |   3 +-
 .../arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi |   4 +-
 arch/arm64/boot/dts/xilinx/zynqmp.dtsi        |   4 +-
 drivers/usb/dwc3/core.c                       | 117 +++++++++++++++---
 drivers/usb/dwc3/core.h                       |  17 ++-
 6 files changed, 125 insertions(+), 27 deletions(-)