linux-kernel - [PATCH v2 tty-next 0/2] serial: Add driver for National Instruments UARTs

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Message-Id: <20230410211152.94332-1-brenda.streiff@ni.com>
Date:   Mon, 10 Apr 2023 16:11:49 -0500
From:   Brenda Streiff <brenda.streiff@...com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     ilpo.jarvinen@...ux.intel.com,
        Brenda Streiff <brenda.streiff@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 tty-next 0/2] serial: Add driver for National Instruments UARTs

This patch series adds a driver for the 16550-like UARTs on National
Instruments (NI) embedded controller hardware.

These UARTs have an interface that is compatble with the TL16C550C (for
which we build on top of 8250_core) but also has extra registers for
the embedded RS-232/RS-485 tranceiver control circuitry.

Changes from v1 -> v2:
- Schema fixes:
  - Fix schema to now pass "make DT_CHECKER_FLAGS=-m dt_binding_check"
  - Rename unprefixed "transceiver" to "ni,serial-port-mode" with a
    description. Describing this as a "mode" rather than a "transceiver"
    seems more semantically correct in comparison to other DTs; other
    schemas with a "transceiver" property (isp1301, lpc32xx-udc) have
    phandle values, which is not the case here.
- Driver fixes:
  - replace C99 integer types with kernel types
  - reverse christmas tree
  - stuff PMR mode/cap masks into locals to avoid repetition
  - wrap ACPI match table in #ifdef CONFIG_ACPI to avoid build error on
    non-ACPI platforms
  - NI 16550s are only on x86 and Zynq-7000 NI devices, so constrain the
    Kconfig "depends" to only present it as an option to users on those
    architectures, to prevent it from being needlessly built on platforms
    that would not possibly have them.
  - document module name
  - add check for "ni,serial-port-mode" property; "transceiver" remains
    for sake of compatibility with _DSD ACPI objects for NI controller
    BIOSes currently in-field (but also DSD-properties-rules.rst says
    that _DSD properties don't have to be identical to DT bindings.)

Brenda Streiff (2):
  dt-bindings: serial: ni,ni16650: add bindings
  serial: 8250: add driver for NI UARTs

 .../bindings/serial/ni,ni16550.yaml           |  51 ++
 MAINTAINERS                                   |   7 +
 drivers/tty/serial/8250/8250_ni.c             | 454 ++++++++++++++++++
 drivers/tty/serial/8250/Kconfig               |  13 +
 drivers/tty/serial/8250/Makefile              |   1 +
 5 files changed, 526 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/ni,ni16550.yaml
 create mode 100644 drivers/tty/serial/8250/8250_ni.c

-- 
2.30.2