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Date: Tue, 15 Dec 2020 14:02:19 -0600
From: Rob Herring <robh@...nel.org>
To: József Horváth <info@...istro.hu>
Cc: 'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
'Jiri Slaby' <jirislaby@...nel.org>,
linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] Serial: silabs si4455 serial driver
On Tue, Dec 15, 2020 at 07:20:07AM +0000, József Horváth wrote:
> This is a serial port driver for
> Silicon Labs Si4455 Sub-GHz transciver.
>
> The goal of this driver is to removing wires
> between central(linux) device and remote serial devices/sensors,
> but keeping the original user software.
> It represents regular serial interface for the user space.
>
> Datasheet: https://www.silabs.com/documents/public/data-sheets/Si4455.pdf
>
> changes v1:
> - fixed: drivers: serial: si4455: coding style
> - fixed: drivers: serial: si4455: error checking and order
> - fixed: drivers: serial: si4455: remove unnecessary compatibility
> strings from si4455_dt_ids
> - fixed: dt-bindings: rename sdn-gpios to shutdown-gpios
>
> changes v2:
> - fixed: drivers: serial: si4455: coding style
>
> changes v3:
> - fixed: drivers: serial: si4455: coding style
> - fixed: drivers: serial: si4455: replace device configuration procedure
> (SI4455_IOC_SEZC ioctl call) with request_firmware(...).
> The firmware name comes from dt (silabs,ez-config)
> - fixed: drivers: serial: si4455: replace transmit/receive channel
> select (SI4455_IOC_STXC/SI4455_IOC_SRXC ioctl calls)
> with sysfs entries (tx_channel, rx_channel).
> Initial values comes from dt (silabs,tx-channel and silabs,rx-channel)
> - fixed: drivers: serial: si4455: replace package size setting
> (SI4455_IOC_SSIZ ioctl call) with sysfs entry (package_size).
> Initial value comes from dt (silabs,package-size)
> - fixed: drivers: serial: si4455: replace getting last rssi
> (SI4455_IOC_GRSSI ioctl call) with sysfs entry (current_rssi)
> - fixed: drivers: serial: si4455: remove si4455_api.h
> and custom ioctl definitions
> - fixed: dt-bindings: silabs,si4455: more detailed description
> - added: dt-bindings: silabs,si4455: properties silabs,package-size,
> silabs,tx-channel, silabs,rx-channel, silabs,ez-config
>
> changes v4:
> - fixed: dt-bindings: silabs,si4455: $id
> from http://devicetree.org/schemas/serial/silabs,si4455.yaml
> to http://devicetree.org/schemas/staging/serial/silabs,si4455.yaml
>
> changes v5:
> - fixed: drivers: serial: si4455: coding style
> - fixed: drivers: serial: si4455: remove struct si4455_one,
> members moved to struct si4455_port
> - fixed: drivers: serial: si4455: fix line endings in dev_err and
> dev_dbg messages
> - fixed: drivers: serial: si4455: remove unnecessary else { ... }
> - fixed: drivers: serial: si4455: refactor si4455_do_work(...),
> xmit circular buffer handling and start tx moved to
> si4455_start_tx_xmit(...)
> - fixed: drivers: serial: si4455: refactor si4455_configure
> - fixed: drivers: serial: si4455: refactor interrupt handling,
> remove unnecessary wrapper
> - fixed: drivers: serial: si4455: modem line(si4455_get_mctrl)
> and tx buffer status(si4455_tx_empty) conditions and signaling
> - fixed: drivers: serial: si4455: remove unsafe int to pointer conversion
> - fixed: dt-bindings: silabs,si4455: $id
> from http://devicetree.org/schemas/staging/serial/silabs,si4455.yaml
> to http://devicetree.org/schemas/serial/silabs,si4455.yaml
> - fixed: dt-bindings: silabs,si4455: serial.yaml reference added
The revision history should be after the '---' so it is not in the git
history when applied.
> Signed-off-by: József Horváth <info@...istro.hu>
> ---
> .../bindings/serial/silabs,si4455.yaml | 98 ++
Please make the binding a separate patch.
> MAINTAINERS | 6 +
> drivers/tty/serial/Kconfig | 8 +
> drivers/tty/serial/Makefile | 1 +
> drivers/tty/serial/si4455.c | 1372 +++++++++++++++++
> 5 files changed, 1485 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/serial/silabs,si4455.yaml
> create mode 100644 drivers/tty/serial/si4455.c
>
> diff --git a/Documentation/devicetree/bindings/serial/silabs,si4455.yaml b/Documentation/devicetree/bindings/serial/silabs,si4455.yaml
> new file mode 100644
> index 000000000000..ddff67e6a667
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/silabs,si4455.yaml
> @@ -0,0 +1,98 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/serial/silabs,si4455.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Silicon Labs Si4455 device tree bindings
> +
> +maintainers:
> + - József Horváth <info@...istro.hu>
> +
> +description:
> + This document is for describing the required device tree parameters for si4455 serial driver.
> + The si4455 driver tries to represent the Silicon Labs Si4455 sub-GHz transceiver device
> + like a serial port. The required parameters for proper operation are described below.
> + https://www.silabs.com/documents/public/data-sheets/Si4455.pdf
> +
> +allOf:
> + - $ref: "serial.yaml#"
> +
> +properties:
> + compatible:
> + const: silabs,si4455
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + spi-max-frequency:
> + description: maximum clock frequency on SPI port
> + maximum: 500000
> +
> + shutdown-gpios:
> + description: gpio pin for SDN
> + maxItems: 1
> +
> + silabs,package-size:
> + description:
> + Radio payload length, variable packet length is not supported by driver.
> + This value should equal with EZConfig payload length.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + maximum: 64
> + minimum: 1
> +
> + silabs,tx-channel:
> + description:
> + Radio transmit channel selection.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + maximum: 255
> + minimum: 0
> +
> + silabs,rx-channel:
> + description:
> + Radio receive channel selection.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + maximum: 255
> + minimum: 0
> +
> + silabs,ez-config:
> + description:
> + Radio configuration data file name.
> + $ref: /schemas/types.yaml#/definitions/string
> + items:
> + pattern: ^[0-9a-z\._\-]{1,255}$
We use 'firmware-name' property for this purpose.
Looks good otherwise.
> +
> +required:
> + - reg
> + - interrupts
> + - spi-max-frequency
> + - shutdown-gpios
> + - silabs,package-size
> + - silabs,tx-channel
> + - silabs,rx-channel
> + - silabs,ez-config
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + spi {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + si4455_0: serial@0 {
> + compatible = "silabs,si4455";
> + reg = <0>;
> + interrupt-parent = <&gpio>;
> + interrupts = <7 2>;
> + shutdown-gpios = <&gpio 26 1>;
> + spi-max-frequency = <300000>;
> + silabs,package-size = <30>;
> + silabs,tx-channel = <1>;
> + silabs,rx-channel = <2>;
> + silabs,ez-config = "si4455_spi0_0.ez.bin";
> + };
> + };
> +...
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