Re: [PATCH v11 00/10] RISC-V Kendryte K210 support improvements

[Damien Le Moal <Damien.LeMoal@wdc.com>]

On 2021/01/12 9:58, Damien Le Moal wrote:
> This series of patches improves support for boards based on the Canaan
> Kendryte K210 RISC-V dual core SoC. Minimal support for this SoC is
> already included in the kernel. These patches complete it, enabling
> support for most peripherals present on the SoC as well as introducing
> device trees for the various K210 boards available on the market today
> from SiPeed and Kendryte.
> 
> The patches here are the remaining patches of the series not applied
> yet. Patch 1 adds the SoC clock driver and patch 2 adds the pinctrl
> driver.

I screwed up with my git-send-email setup and patch 1 and 2 went only to Palmer
and the riscv list. I resent these eparately to Stephen/linux-clk and
Linus/linux-gpio respectively (suppress-cc and other related cc&to control
options interactions are a bit obscure to me...).

My apologies for the mess. Please let me know if I should resend correctly the
entire series.

> 
> Patches 3 to 8 update the existing K210 device tree and add new
> device tree files for several K210 based boards: MAIX Bit, MAIXDUINO,
> MAIX Dock and MAIX Go boards from SiPeed and the KD233 development
> board from Canaan.
> 
> Finally the last two patches updates the k210 nommu defconfig to include
> the newly implemented drivers and provide a new default configuration
> file enabling SD card support.
> 
> A lot of the work on the device tree and on the K210 drivers come from
> the work by Sean Anderson for the U-Boot project support of the K210
> SoC. Sean also helped with debugging many aspects of this series.
> 
> A tree with all patches applied is available here:
> https://github.com/damien-lemoal/linux, k210-sysctl-v24 branch.
> A demonstration of this series used on a SiPeed MAIX Dock
> board together with an I2C servo controller can be seen here:
> https://damien-lemoal.github.io/linux-robot-arm/#example
> 
> This tree was used to build userspace busybox environment image that is
> then copied onto an SD card formatted with ext2:
> https://github.com/damien-lemoal/buildroot
> Of note is that running this userspace environment requires a revert of
> commit 2217b982624680d19a80ebb4600d05c8586c4f96 introduced during the
> 5.9 development cycle. Without this revert, execution of the init
> process fails. A problem with the riscv port of elf2flt is suspected but
> not confirmed. I am now starting to investigate this problem.
> 
> Reviews and comments are as always much welcome.
> 
> Changes from v10:
> * Rebased on riscv tree fixes+for-next branches. Patches already applied
>   to these branches were removed from this series.
> * Fixed the clock driver and pinctrl driver patch titles to indicate the
>   correct target sub-components.
> * Applied reviewed-by tags from Anup.
> 
> Changes from v9:
> * Added patch 6 to avoid DTS compilation errors after patch 9 is
>   applied and until patch 16 is applied.
> 
> Changes from v8:
> * Addressed Rob's comments on the sysctl driver bindings documentation
> * Fixed a typo in the fpios driver bindings documentation
> 
> Changes from v7:
> * Removed the __init annotation for the drivers reset, pinctrl and
>   sysctl drivers probe functions as suggested by Geert. Also removed
>   the __refdata annotation for the struct platform_driver variables of
>   these drivers.
> 
> Changes from v6:
> * Annotate struct platform_driver variables with __refdata to avoid
>   section mismatch compilation errors
> * Add empty sentinel entry to of_device_id tables of the sysctl, reset
>   and pinctrl drivers.
> 
> Changes from v5:
> * Addressed Philipp's comment on the reset controller driver
> * Added patch 6 to reduce the size of the clock driver patch
>   (now patch 12).
> 
> Changes from v4:
> * Simplified reset controller driver using of_xlate callback as
>   suggested by Philipp
> * Fixed compilation error when using other configs than one of the
>   nommu_k210 defconfigs.
> * Addressed most clock driver comments from Stephen.
> * Removed CONFIG_GPIO_SYSFS from defconfigs
> * Rebased on 5.10-rc7
> 
> Changes from V3:
> * Add one entry per driver in MAINTAINERS file
> 
> Changes from V2:
> * Add MAINTAINERS file entry for the SoC support, listing myself as
>   maintainer.
> * Removed use of postcore_initcall() for declaring the drivers, using
>   the regular builtin_platform_driver() instead.
> * Fixed fpio pinctrl driver bindings documentation as commented by
>   Geert: removed input-schmitt and added input-schmitt-disable, fixed
>   typo and added input-disable and output-disable.
> * Fixed device tree to have cs-gpios active low, as per the default, as
>   active high necessity was an artifact of the gpio level double
>   inversion bug fixed recently.
> * Removed CONFIG_VT from defconfigs to reduce the kernel image size as
>   suggested by Geert.
> 
> Changes from v1:
> * Improved DT bindings documentation
> * SPI and GPIO patches removed from this series (and being processed
>   directly through the relevant subsystems directly)
> * Improved device trees
> * Various cleanup and improvments of the drivers
> 
> Damien Le Moal (10):
>   clk: Add RISC-V Canaan Kendryte K210 clock driver
>   pinctrl: Add RISC-V Canaan Kendryte K210 FPIOA driver
>   riscv: Update Canaan Kendryte K210 device tree
>   riscv: Add SiPeed MAIX BiT board device tree
>   riscv: Add SiPeed MAIX DOCK board device tree
>   riscv: Add SiPeed MAIX GO board device tree
>   riscv: Add SiPeed MAIXDUINO board device tree
>   riscv: Add Kendryte KD233 board device tree
>   riscv: Update Canaan Kendryte K210 defconfig
>   riscv: Add Canaan Kendryte K210 SD card defconfig
> 
>  MAINTAINERS                                   |    8 +
>  arch/riscv/Kconfig.socs                       |    3 +-
>  arch/riscv/boot/dts/canaan/canaan_kd233.dts   |  178 +++
>  arch/riscv/boot/dts/canaan/k210.dts           |   23 -
>  arch/riscv/boot/dts/canaan/k210.dtsi          |  551 ++++++++-
>  arch/riscv/boot/dts/canaan/k210_generic.dts   |   46 +
>  .../riscv/boot/dts/canaan/sipeed_maix_bit.dts |  227 ++++
>  .../boot/dts/canaan/sipeed_maix_dock.dts      |  229 ++++
>  arch/riscv/boot/dts/canaan/sipeed_maix_go.dts |  237 ++++
>  .../boot/dts/canaan/sipeed_maixduino.dts      |  201 ++++
>  arch/riscv/configs/nommu_k210_defconfig       |   44 +-
>  .../riscv/configs/nommu_k210_sdcard_defconfig |   92 ++
>  drivers/clk/Kconfig                           |    8 +
>  drivers/clk/Makefile                          |    1 +
>  drivers/clk/clk-k210.c                        | 1005 +++++++++++++++++
>  drivers/pinctrl/Kconfig                       |   13 +
>  drivers/pinctrl/Makefile                      |    1 +
>  drivers/pinctrl/pinctrl-k210.c                |  985 ++++++++++++++++
>  drivers/soc/canaan/Kconfig                    |   18 +-
>  drivers/soc/canaan/Makefile                   |    2 +-
>  drivers/soc/canaan/k210-sysctl.c              |  205 +---
>  include/dt-bindings/clock/k210-clk.h          |    1 -
>  include/soc/canaan/k210-sysctl.h              |    2 +
>  23 files changed, 3844 insertions(+), 236 deletions(-)
>  create mode 100644 arch/riscv/boot/dts/canaan/canaan_kd233.dts
>  delete mode 100644 arch/riscv/boot/dts/canaan/k210.dts
>  create mode 100644 arch/riscv/boot/dts/canaan/k210_generic.dts
>  create mode 100644 arch/riscv/boot/dts/canaan/sipeed_maix_bit.dts
>  create mode 100644 arch/riscv/boot/dts/canaan/sipeed_maix_dock.dts
>  create mode 100644 arch/riscv/boot/dts/canaan/sipeed_maix_go.dts
>  create mode 100644 arch/riscv/boot/dts/canaan/sipeed_maixduino.dts
>  create mode 100644 arch/riscv/configs/nommu_k210_sdcard_defconfig
>  create mode 100644 drivers/clk/clk-k210.c
>  create mode 100644 drivers/pinctrl/pinctrl-k210.c
> 
> Cc: Stephen Boyd <sboyd@kernel.org>
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: linux-clk@vger.kernel.org
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: linux-gpio@vger.kernel.org
> 


-- 
Damien Le Moal
Western Digital Research