[PATCH 0/3] tty: serial: Add Cortina-Access UART driver and platform support

[Jason Li]

This series adds Linux kernel support for the UART controller integrated
in Cortina-Access SoCs, with CA8289 (Venus) as the first supported device.

Patch 1 adds the DT binding schema for the UART controller and the
top-level ARM board binding document for the Cortina-Access SoC family,
along with the vendor prefix.

Patch 2 introduces the serial driver (serial_cortina-access.c).  The
UART IP has a simple FIFO-based design with a single interrupt line.
The driver uses uart_port_tx() for TX, handles earlycon initialisation
when the bootloader leaves the UART disabled, and provides a TX FIFO
kick-start in start_tx() to work around edge-triggered interrupt
behaviour.  Clock frequency is obtained exclusively via the clk
framework.

Patch 3 adds the device tree sources for the CA8289 SoC and its
engineering board, covering the minimal hardware description needed to
boot a kernel with an INITRD rootfs.

Tested on CA8289 engineering board; console and earlycon both verified
at 115200 baud.

Jason Li (3):
  dt-bindings: serial: Add binding for Cortina-Access UART
  tty: serial: Add UART driver for Cortina-Access platform
  arm64: dts: cortina-access: Add DTS for CA8289 SoC and Venus board

 .../bindings/arm/cortina-access.yaml          |  29 +
 .../serial/cortina-access,serial.yaml         |  46 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 MAINTAINERS                                   |  14 +
 arch/arm64/Kconfig.platforms                  |  10 +
 arch/arm64/boot/dts/Makefile                  |   1 +
 arch/arm64/boot/dts/cortina-access/Makefile   |   2 +
 .../dts/cortina-access/ca8289-engboard.dts    |  31 +
 .../boot/dts/cortina-access/ca8289-soc.dtsi   | 118 +++
 drivers/tty/serial/Kconfig                    |  21 +
 drivers/tty/serial/Makefile                   |   1 +
 drivers/tty/serial/serial_cortina-access.c    | 755 ++++++++++++++++++
 12 files changed, 1030 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/cortina-access.yaml
 create mode 100644 Documentation/devicetree/bindings/serial/cortina-access,serial.yaml
 create mode 100644 arch/arm64/boot/dts/cortina-access/Makefile
 create mode 100644 arch/arm64/boot/dts/cortina-access/ca8289-engboard.dts
 create mode 100644 arch/arm64/boot/dts/cortina-access/ca8289-soc.dtsi
 create mode 100644 drivers/tty/serial/serial_cortina-access.c

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2.39.5