Basic StarFive JH7100 RISC-V SoC support for 5.17

The following changes since commit fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf:

Linux 5.16-rc1 (2021-11-14 13:56:52 -0800)

are available in the Git repository at:

https://github.com/esmil/linux.git tags/jh7100-for-5.17

for you to fetch changes up to a43676272a6e0b398781bc5337ca4cc187ba923d:

RISC-V: Add BeagleV Starlight Beta device tree (2021-12-16 17:24:23 +0100)

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Basic StarFive JH7100 RISC-V SoC support

This adds support for the StarFive JH7100 RISC-V SoC. The SoC has many devices that need non-coherent DMA operations to work which isn't upstream yet[1], so this just adds basic support to boot up, get a serial console, blink an LED and reboot itself. Unlike the Allwinner D1 this chip doesn't use any extra pagetable bits, but instead the DDR RAM appears twice in the memory map, with and without the cache.

The JH7100 is a test chip for the upcoming JH7110 and about 300 BeagleV Starlight Beta boards were sent out with them as part of a now cancelled BeagleBoard.org project. However StarFive has produced more of the JH7100s and will be selling VisionFive boards with them soon[2].

[1]: https://lore.kernel.org/linux-riscv/[email protected]/
[2]: https://www.cnx-software.com/2021/12/09/starfive-visionfive-single-board-computer-for-sale-accelerating-risc-v-ecosystem-development/

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Changes since pull request v1:
- Added Stephen Boyds Acked-by to clock patches
- Use signed tag with a description

Changes since v4:
- The reset driver now always uses 64bit read/write on registers even on 32bit architectures as requested by Andy.

Changes since v3:
- The reset driver now uses 64bit read/write on the registers so we can use the regular bitmap macros. Requested by Andy.
- The pinctrl driver no longer resets the GPIO irq handler to handle_bad_irq on errors, uses reverse xmas tree order where possible and other nits by Andy.

Changes since v2:
- Ahmad and Geert agreed to switch the license of the clock and reset dt headers to GPL-2.0 OR MIT, so that both headers and device tree files can all use the same license.
Bindings are still GPL-2.0-only OR BSD-2-Clause as recommended.
- Clock and reset drivers now set .suppress_bind_attrs = true and use builtin_platform_driver_probe to make sure the probe function is only called at init time so we can use __init and __initconst.
- The clock driver now uses devm_clk_hw_register and .parent_data when registering clocks. This way we can use the dt clock indexes rather than strings for parent lists and decrease the amount of static data needed considerably.
- Various dt binding cleanups from Rob
- Reworked description in the pinctrl dt binding.
- Pinctrl driver now depends on CONFIG_OF again since it uses pinconf_generic_parse_dt_config which is otherwise not defined.
- Pinctrl no longer devm_kfree's data that won't be referenced if dt pinconf parsing fails before registering groups and function, and other nits by Andy.
- The dw8250 quirk no longer needs a skip_clk_set_rate bit, but sets port->set_termios to the function called after clk_set_rate.

Changes since v1:
- Let SOC_STARFIVE select RESET_CONTROLLER but drop SERIAL_8250_DW
- Add missing Signed-of-by to clock dt-binding header
- Use builtin_platform_driver macro for the clock driver, add explicit comment to the determine_rate callback and other small nits from Andy
- Use reset-controller for node names in documentation and device tree
- Use readl_poll_timeout in reset driver to avoid hanging forever if a driver leaves the associated clock gated and sort Kconfig and Makefile entries properly.
- In the pinctrl driver align register names with documentation, remove invalid __init tag from probe function, use of_property_* functions to parse device tree, hoist pinmux unpacking into helper function to better document what's going on, bail on invalid signal group in device tree and fix many other nits from Andy.
- Refactor and rebase 8250_dw quirk on tty-next

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Emil Renner Berthing (12):
RISC-V: Add StarFive SoC Kconfig option
dt-bindings: timer: Add StarFive JH7100 clint
dt-bindings: interrupt-controller: Add StarFive JH7100 plic
dt-bindings: reset: Add Starfive JH7100 reset bindings
reset: starfive-jh7100: Add StarFive JH7100 reset driver
dt-bindings: pinctrl: Add StarFive pinctrl definitions
dt-bindings: pinctrl: Add StarFive JH7100 bindings
pinctrl: starfive: Add pinctrl driver for StarFive SoCs
dt-bindings: serial: snps-dw-apb-uart: Add JH7100 uarts
serial: 8250_dw: Add StarFive JH7100 quirk
RISC-V: Add initial StarFive JH7100 device tree
RISC-V: Add BeagleV Starlight Beta device tree

Geert Uytterhoeven (4):
dt-bindings: clock: starfive: Add JH7100 clock definitions
dt-bindings: clock: starfive: Add JH7100 bindings
clk: starfive: Add JH7100 clock generator driver
dt-bindings: reset: Add StarFive JH7100 reset definitions

 .../bindings/clock/starfive,jh7100-clkgen.yaml     |   56 +
 .../interrupt-controller/sifive,plic-1.0.0.yaml    |    1 +
 .../bindings/pinctrl/starfive,jh7100-pinctrl.yaml  |  307 +++++
 .../bindings/reset/starfive,jh7100-reset.yaml      |   38 +
 .../bindings/serial/snps-dw-apb-uart.yaml          |    5 +
 .../devicetree/bindings/timer/sifive,clint.yaml    |    1 +
 MAINTAINERS                                        |   22 +
 arch/riscv/Kconfig.socs                            |    8 +
 arch/riscv/boot/dts/Makefile                       |    1 +
 arch/riscv/boot/dts/starfive/Makefile              |    2 +
 .../boot/dts/starfive/jh7100-beaglev-starlight.dts |  164 +++
 arch/riscv/boot/dts/starfive/jh7100.dtsi           |  230 ++++
 drivers/clk/Kconfig                                |    1 +
 drivers/clk/Makefile                               |    1 +
 drivers/clk/starfive/Kconfig                       |    9 +
 drivers/clk/starfive/Makefile                      |    3 +
 drivers/clk/starfive/clk-starfive-jh7100.c         |  689 ++++++++++
 drivers/pinctrl/Kconfig                            |   17 +
 drivers/pinctrl/Makefile                           |    1 +
 drivers/pinctrl/pinctrl-starfive.c                 | 1354 ++++++++++++++++++++
 drivers/reset/Kconfig                              |    7 +
 drivers/reset/Makefile                             |    1 +
 drivers/reset/reset-starfive-jh7100.c              |  172 +++
 drivers/tty/serial/8250/8250_dw.c                  |    3 +
 include/dt-bindings/clock/starfive-jh7100.h        |  202 +++
 include/dt-bindings/pinctrl/pinctrl-starfive.h     |  275 ++++
 include/dt-bindings/reset/starfive-jh7100.h        |  126 ++
 27 files changed, 3696 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/starfive,jh7100-clkgen.yaml
 create mode 100644 Documentation/devicetree/bindings/pinctrl/starfive,jh7100-pinctrl.yaml
 create mode 100644 Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
 create mode 100644 arch/riscv/boot/dts/starfive/Makefile
 create mode 100644 arch/riscv/boot/dts/starfive/jh7100-beaglev-starlight.dts
 create mode 100644 arch/riscv/boot/dts/starfive/jh7100.dtsi
 create mode 100644 drivers/clk/starfive/Kconfig
 create mode 100644 drivers/clk/starfive/Makefile
 create mode 100644 drivers/clk/starfive/clk-starfive-jh7100.c
 create mode 100644 drivers/pinctrl/pinctrl-starfive.c
 create mode 100644 drivers/reset/reset-starfive-jh7100.c
 create mode 100644 include/dt-bindings/clock/starfive-jh7100.h
 create mode 100644 include/dt-bindings/pinctrl/pinctrl-starfive.h
 create mode 100644 include/dt-bindings/reset/starfive-jh7100.h