[v3,0/7] Add PLL clocks driver for StarFive JH7110 SoC

This patch serises are to add PLL clocks driver and providers by writing
and reading syscon registers for the StarFive JH7110 RISC-V SoC. And add
documentation to describe StarFive System Controller(syscon) Registers.

PLL are high speed, low jitter frequency synthesizers in JH7110.
Each PLL clocks work in integer mode or fraction mode by some dividers,
and the dividers are set in several syscon registers.
The formula for calculating frequency is: 
Fvco = Fref * (NI + NF) / M / Q1

The first patch adds docunmentation to describe PLL clock bindings,
and the second patch adds driver to support PLL clocks for JH7110.
The patch 3 modifies the SYSCRG dibindings and adds PLL clock inputs.
The patch 4 modifies the system clock driver and changes PLL clock source
from PLL clock controller instead of the fixed factor clocks. The patch 5
adds documentation to decribe syscon registers. And the patch 6 adds the
stg/sys/aon syscon nodes for JH7110 SoC. The last patch adds PLL 
clock node and modifies the syscrg node in JH7110 dts file.

This patchset should be applied after these patchset about JH7110 basic
clock drivers(Accepted and will merged in v6.4)[1].
[1] https://lore.kernel.org/all/20230401111934.130844-1-hal.feng@starfivetech.com/

Changes since v2:
- Rebased on latest JH7110 basic clock drivers.
- Added the complete documentation to describe syscon register.
- Added syscon node in JH7110 dts file.
- Modified the clock rate selection to match the closest rate in
  PLL driver when setting rate.

v2: https://lore.kernel.org/all/20230316030514.137427-1-xingyu.wu@starfivetech.com/

Changes since v1: 
- Changed PLL clock node to be child of syscon node in dts.
- Modifed the definitions and names of function in PLL clock driver.
- Added commit to update syscon and syscrg dt-bindings.

v1: https://lore.kernel.org/all/20230221141147.303642-1-xingyu.wu@starfivetech.com/

William Qiu (2):
  dt-bindings: soc: starfive: Add StarFive syscon module
  riscv: dts: starfive: jh7110: Add syscon nodes

Xingyu Wu (5):
  dt-bindings: clock: Add StarFive JH7110 PLL clock generator
  clk: starfive: Add StarFive JH7110 PLL clock driver
  dt-bindings: clock: jh7110-syscrg: Add PLL clock inputs
  clk: starfive: jh7110-sys: Modify PLL clocks source
  riscv: dts: starfive: jh7110: Add PLL clock node and modify syscrg
    node

 .../bindings/clock/starfive,jh7110-pll.yaml   |  46 ++
 .../clock/starfive,jh7110-syscrg.yaml         |  20 +-
 .../soc/starfive/starfive,jh7110-syscon.yaml  |  58 +++
 MAINTAINERS                                   |  12 +
 arch/riscv/boot/dts/starfive/jh7110.dtsi      |  29 +-
 drivers/clk/starfive/Kconfig                  |   9 +
 drivers/clk/starfive/Makefile                 |   1 +
 .../clk/starfive/clk-starfive-jh7110-pll.c    | 427 ++++++++++++++++++
 .../clk/starfive/clk-starfive-jh7110-pll.h    | 293 ++++++++++++
 .../clk/starfive/clk-starfive-jh7110-sys.c    |  31 +-
 .../dt-bindings/clock/starfive,jh7110-crg.h   |   6 +
 11 files changed, 903 insertions(+), 29 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/starfive,jh7110-pll.yaml
 create mode 100644 Documentation/devicetree/bindings/soc/starfive/starfive,jh7110-syscon.yaml
 create mode 100644 drivers/clk/starfive/clk-starfive-jh7110-pll.c
 create mode 100644 drivers/clk/starfive/clk-starfive-jh7110-pll.h


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