[PATCH v3 00/12] riscv: Add Sipeed Maix support

[Sean Anderson <seanga2@gmail.com>]

This patch series adds support for Sipeed Maix boards and the
Kendryte K210 CPU. Currently, only the Maix Bit V2.0 is supported,
however other models are similar. This series depends on
<https://patchwork.ozlabs.org/patch/1215327/>
(clk: Include missing headers for linux/clk-provider.h).
In addition, there are optional dependencies on
<https://patchwork.ozlabs.org/project/uboot/list/?series=156377>
<https://patchwork.ozlabs.org/project/uboot/list/?series=156381> and
<https://patchwork.ozlabs.org/patch/1232422/>
(wdt: Add DM support for Designware WDT)
(riscv: Try to get cpu frequency from device tree)
(serial: Set baudrate on boot)

To flash u-boot to a maix bit, run
kflash -tp /dev/<your tty here> -B bit_mic u-boot-dtb.bin

Boot output should look like the following:

U-Boot 2020.01-00455-gad03fd83e1 (Jan 15 2020 - 17:10:24 -0500)

DRAM:  8 MiB
MMC:   spi at 52000000:slot at 0: 0
In:    serial at 38000000
Out:   serial at 38000000
Err:   serial at 38000000
=> 

Note that spi does not work! I am trying to figure out what the problem is, but
for the moment the only way to boot something is to transfer it over serial.

Changes for v3:
  Remove patch to set RV64I as default.
  Remove patch for a separate sysctl driver.
  Split off cpu frequency patch into its own series.
  Reorder support/devicetree patches to come last.
  Add patch for reset driver.
  Add simple-pm-bus for busses with their own clocks.
  Add additional documentation.
  Reword mcounteren patch to refer to the RISC-V priv spec 1.9.1.
  Many devicetree changes
  Switch to "make savedefconfig" to generate the config

Changes for v2:
  Many bugfixes for the device tree.
  Modify the config to build without errors.
  Add support for keeping internal PLL frequencies in-range.
  Fix several rebase-induced artifacts.

Sean Anderson (12):
  clk: Always use the supplied struct clk
  clk: Check that ops of composite clock components exist before calling
  clk: Unconditionally recursively en-/dis-able clocks
  reset: Add generic reset driver
  dm: Add support for simple-pm-bus
  riscv: Add headers for asm/global_data.h
  riscv: Add option to support RISC-V privileged spec 1.9.1
  riscv: Allow use of reset drivers
  riscv: Add K210 pll support
  riscv: Add K210 clock support
  riscv: Add device tree for K210
  riscv: Add initial Sipeed Maix support

 arch/riscv/Kconfig                            |  14 +
 arch/riscv/cpu/cpu.c                          |   6 +
 arch/riscv/dts/Makefile                       |   1 +
 arch/riscv/dts/k210-maix-bit.dts              |  42 ++
 arch/riscv/dts/k210.dtsi                      | 496 ++++++++++++++
 arch/riscv/include/asm/csr.h                  |   6 +
 arch/riscv/include/asm/global_data.h          |   2 +
 arch/riscv/lib/reset.c                        |   2 +
 board/sipeed/maix/Kconfig                     |  51 ++
 board/sipeed/maix/MAINTAINERS                 |  10 +
 board/sipeed/maix/Makefile                    |   5 +
 board/sipeed/maix/maix.c                      |   9 +
 configs/sipeed_maix_bitm_defconfig            |  10 +
 doc/board/index.rst                           |   1 +
 doc/board/kendryte/index.rst                  |   9 +
 doc/board/kendryte/k210.rst                   |  46 ++
 .../bus/simple-pm-bus.txt                     |  44 ++
 .../reset/syscon-reset.txt                    |  36 ++
 doc/imx/clk/ccf.txt                           |  63 +-
 drivers/clk/Kconfig                           |   1 +
 drivers/clk/Makefile                          |   1 +
 drivers/clk/clk-composite.c                   |  65 +-
 drivers/clk/clk-divider.c                     |   6 +-
 drivers/clk/clk-fixed-factor.c                |   3 +-
 drivers/clk/clk-gate.c                        |   6 +-
 drivers/clk/clk-mux.c                         |  12 +-
 drivers/clk/clk-uclass.c                      |  58 +-
 drivers/clk/imx/clk-gate2.c                   |   4 +-
 drivers/clk/kendryte/Kconfig                  |  12 +
 drivers/clk/kendryte/Makefile                 |   1 +
 drivers/clk/kendryte/clk.c                    | 390 +++++++++++
 drivers/clk/kendryte/clk.h                    |  27 +
 drivers/clk/kendryte/pll.c                    | 607 ++++++++++++++++++
 drivers/clk/kendryte/pll.h                    |  38 ++
 drivers/core/simple-bus.c                     |  57 +-
 drivers/reset/Kconfig                         |   6 +-
 drivers/reset/Makefile                        |   1 +
 drivers/reset/reset-syscon.c                  |  79 +++
 include/configs/sipeed-maix.h                 |  19 +
 include/dt-bindings/clock/k210-sysctl.h       |  53 ++
 include/dt-bindings/mfd/k210-sysctl.h         |  38 ++
 include/dt-bindings/reset/k210-sysctl.h       |  38 ++
 42 files changed, 2266 insertions(+), 109 deletions(-)
 create mode 100644 arch/riscv/dts/k210-maix-bit.dts
 create mode 100644 arch/riscv/dts/k210.dtsi
 create mode 100644 board/sipeed/maix/Kconfig
 create mode 100644 board/sipeed/maix/MAINTAINERS
 create mode 100644 board/sipeed/maix/Makefile
 create mode 100644 board/sipeed/maix/maix.c
 create mode 100644 configs/sipeed_maix_bitm_defconfig
 create mode 100644 doc/board/kendryte/index.rst
 create mode 100644 doc/board/kendryte/k210.rst
 create mode 100644 doc/device-tree-bindings/bus/simple-pm-bus.txt
 create mode 100644 doc/device-tree-bindings/reset/syscon-reset.txt
 create mode 100644 drivers/clk/kendryte/Kconfig
 create mode 100644 drivers/clk/kendryte/Makefile
 create mode 100644 drivers/clk/kendryte/clk.c
 create mode 100644 drivers/clk/kendryte/clk.h
 create mode 100644 drivers/clk/kendryte/pll.c
 create mode 100644 drivers/clk/kendryte/pll.h
 create mode 100644 drivers/reset/reset-syscon.c
 create mode 100644 include/configs/sipeed-maix.h
 create mode 100644 include/dt-bindings/clock/k210-sysctl.h
 create mode 100644 include/dt-bindings/mfd/k210-sysctl.h
 create mode 100644 include/dt-bindings/reset/k210-sysctl.h

-- 
2.25.0