clk: meson: add a sub EMMC clock controller support

This driver will add a MMC clock controller driver support.
The original idea about adding a clock controller is during the
discussion in the NAND driver mainline effort[1].

This driver is tested in the S400 board (AXG platform) with NAND driver.

Changes since v9 [10]
 - use clk_parent_data instead of parent_names

Changes since v8 [9]
 - use MESON_SCLK_ONE_BASED instead of CLK_DIVIDER_ONE_BASED
 - use struct_size to caculate onecell_data
 - add clk-phase-delay.h
 - define CLK_DELAY_STEP_PS_GX and CLK_DELAY_STEP_PS_AXG

Changes since v7 [8]
 - move meson_clk_get_phase_delay_data() from header to driver
 - CONFIG sclk-div with COMMON_CLK_AMLOGIC instead of COMMON_CLK_AMLOGIC_AUDIO
 - remove onecell date and ID for internal MUX clk
 - use helper for functions for ONE_BASED in sclk-div
 - add ONE_BASED support for duty cycle

Changes since v6 [7]:
 - add one based support for sclk divier
 - alloc sclk in probe for multiple instance
 - fix coding styles

Changes since v5 [6]:
 - remove divider ops with .init and use sclk_div instead
 - drop CLK_DIVIDER_ROUND_CLOSEST in mux and div
 - drop the useless type cast 

Changes since v4 [5]:
 - use struct parm in phase delay driver
 - remove 0 delay releted part in phase delay driver
 - don't rebuild the parent name once again
 - add divider ops with .init

Changes since v3 [4]:
 - separate clk-phase-delay driver
 - replace clk_get_rate() with clk_hw_get_rate()
 - collect Rob's R-Y
 - drop 'meson-' prefix from compatible string

 Changes since v2 [3]:
 - squash dt-binding clock-id patch
 - update license
 - fix alignment
 - construct a clk register helper() function

Changes since v1 [2]:
 - implement phase clock
 - update compatible name
 - adjust file name
 - divider probe() into small functions, and re-use them

[1] https://lkml.kernel.org/r/20180628090034.0637a062@xps13
[2] https://lkml.kernel.org/r/20180703145716.31860-1-yixun.la...
[3] https://lkml.kernel.org/r/20180710163658.6175-1-yixun.lan...
[4] https://lkml.kernel.org/r/20180712211244.11428-1-yixun.la...
[5] https://lkml.kernel.org/r/20180809070724.11935-4-yixun.la...
[6] https://lkml.kernel.org/r/1539839245-13793-1-git-send-ema...
[7] https://lkml.kernel.org/r/1541089855-19356-1-git-send-ema...
[8] https://lkml.kernel.org/r/1544457877-51301-1-git-send-ema...
[9] https://lkml.kernel.org/r/1545063850-21504-1-git-send-ema...
[10] https://lore.kernel.org/all/20220113115745.45826-1-liang....
Liang Yang (4):
  clk: meson: add one based divider support for sclk
  clk: meson: add emmc sub clock phase delay driver
  clk: meson: add DT documentation for emmc clock controller
  clk: meson: add sub MMC clock controller driver

 .../bindings/clock/amlogic,mmc-clkc.yaml      |  64 ++++
 drivers/clk/meson/Kconfig                     |  18 ++
 drivers/clk/meson/Makefile                    |   2 +
 drivers/clk/meson/clk-phase-delay.c           |  69 ++++
 drivers/clk/meson/clk-phase-delay.h           |  20 ++
 drivers/clk/meson/mmc-clkc.c                  | 302 ++++++++++++++++++
 drivers/clk/meson/sclk-div.c                  |  59 ++--
 drivers/clk/meson/sclk-div.h                  |   3 +
 include/dt-bindings/clock/amlogic,mmc-clkc.h  |  14 +
 9 files changed, 529 insertions(+), 22 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.yaml
 create mode 100644 drivers/clk/meson/clk-phase-delay.c
 create mode 100644 drivers/clk/meson/clk-phase-delay.h
 create mode 100644 drivers/clk/meson/mmc-clkc.c
 create mode 100644 include/dt-bindings/clock/amlogic,mmc-clkc.h

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2.34.1