[PATCH v2 0/8] Add T-Head TH1520 SoC pin control

[Emil Renner Berthing]

This adds a pin control driver for the T-Head TH1520 RISC-V SoC used on
the Lichee Pi 4A and BeagleV Ahead boards and updates the device trees
to make use of it.

It can be easily tested using my th1520 branch at

  https://github.com/esmil/linux.git

..which also adds the MMC, PWM, ethernet and USB drivers that have
been posted but are not upstream yet.

Jisheng: I've added this driver to the generic TH1520 entry in
MAINTAINERS like you did with your USB driver. Let me know if that's not
ok and I'll create a separate entry for this driver with me as
maintainer.

Drew: The last patch is purely based on reading the schematics. It'd be
great if you could give it a spin on real hardware.

Changes since v1
- Keep pinmux data for each pin so we can mux by type instead of directly
  using the mux index. Eg. use function = "uart" etc. (Linus)
- Drop the strong pull-up property and prevent Linux from combining the strong
  pull-up with the regular pull up/down. This also means we can't report such
  usage if it set up by earlier stages, but that problem is deferred until we
  encounter it (Linus)
- Reference pinmux-node.yaml properly (Rob)
- Specify valid pin names for each group (Rob)
- Enable bus clock (Emil)
- Implement gpio_request_enable() and gpio_set_direction() for automatic
  GPIO handling (Emil)
- Drop patch adding gpio-ranges to the gpio-dwapb bindings that is
  merged in gpio/for-next. (Emil)
- Patch 6/8 adding GPIO line names for the Lichee Pi 4M module (Emil)
- Various code nits (Andy)

/Emil

Emil Renner Berthing (8):
  dt-bindings: pinctrl: Add thead,th1520-pinctrl bindings
  pinctrl: Add driver for the T-Head TH1520 SoC
  riscv: dts: thead: Add TH1520 pin control nodes
  riscv: dts: thead: Add TH1520 GPIO ranges
  riscv: dts: thead: Adjust TH1520 GPIO labels
  riscv: dts: thead: Add Lichee Pi 4M GPIO line names
  riscv: dts: thead: Add TH1520 pinctrl settings for UART0
  riscv: dtb: thead: Add BeagleV Ahead LEDs

 .../pinctrl/thead,th1520-pinctrl.yaml         | 372 ++++++++
 MAINTAINERS                                   |   1 +
 .../boot/dts/thead/th1520-beaglev-ahead.dts   |  87 ++
 .../dts/thead/th1520-lichee-module-4a.dtsi    |  43 +
 .../boot/dts/thead/th1520-lichee-pi-4a.dts    |  28 +
 arch/riscv/boot/dts/thead/th1520.dtsi         |  62 +-
 drivers/pinctrl/Kconfig                       |   9 +
 drivers/pinctrl/Makefile                      |   1 +
 drivers/pinctrl/pinctrl-th1520.c              | 891 ++++++++++++++++++
 9 files changed, 1478 insertions(+), 16 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml
 create mode 100644 drivers/pinctrl/pinctrl-th1520.c

-- 
2.43.0