[PATCH v2 00/11] 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).

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
=> 

I would really appreciate feedback! Many of the changes I had to make
for this revision were fairly trivial and could have been caught by
someone more familiar with the source code than I. In particular, there
are still some questions in individual patches which have yet to be
answered.

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 (11):
  clk: Always use the supplied struct clk
  clk: Check that ops of composite clock components exist before calling
  riscv: Add headers for asm/global_data.h
  riscv: Add an option to default to RV64I
  riscv: Add option to disable writes to mcounteren
  riscv: Fix incorrect cpu frequency on RV64
  riscv: Add initial Sipeed Maix support
  riscv: Add device tree for K210
  riscv: Add K210 sysctl support
  riscv: Add K210 pll support
  riscv: Add K210 clock support

 arch/riscv/Kconfig                      |  19 +
 arch/riscv/cpu/cpu.c                    |   2 +
 arch/riscv/dts/Makefile                 |   1 +
 arch/riscv/dts/k210-maix-bit.dts        |  42 ++
 arch/riscv/dts/k210.dtsi                | 453 ++++++++++++++++++
 arch/riscv/include/asm/global_data.h    |   2 +
 arch/riscv/include/asm/k210_sysctl.h    |  43 ++
 arch/riscv/lib/Makefile                 |   1 +
 arch/riscv/lib/k210_sysctl.c            |  21 +
 board/sipeed/maix/Kconfig               |  49 ++
 board/sipeed/maix/MAINTAINERS           |  13 +
 board/sipeed/maix/Makefile              |   5 +
 board/sipeed/maix/maix.c                |   9 +
 configs/sipeed_maix_bitm_defconfig      |  95 ++++
 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/imx/clk-gate2.c             |   4 +-
 drivers/clk/kendryte/Kconfig            |   7 +
 drivers/clk/kendryte/Makefile           |   1 +
 drivers/clk/kendryte/clk.c              | 390 ++++++++++++++++
 drivers/clk/kendryte/clk.h              |  27 ++
 drivers/clk/kendryte/pll.c              | 598 ++++++++++++++++++++++++
 drivers/clk/kendryte/pll.h              |  38 ++
 drivers/cpu/riscv_cpu.c                 |   2 +
 include/configs/sipeed-maix.h           |  19 +
 include/dt-bindings/clock/k210-sysctl.h |  54 +++
 include/dt-bindings/reset/k210-sysctl.h |  38 ++
 32 files changed, 1985 insertions(+), 42 deletions(-)
 create mode 100644 arch/riscv/dts/k210-maix-bit.dts
 create mode 100644 arch/riscv/dts/k210.dtsi
 create mode 100644 arch/riscv/include/asm/k210_sysctl.h
 create mode 100644 arch/riscv/lib/k210_sysctl.c
 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 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 include/configs/sipeed-maix.h
 create mode 100644 include/dt-bindings/clock/k210-sysctl.h
 create mode 100644 include/dt-bindings/reset/k210-sysctl.h

-- 
2.24.1