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Date: Thu, 8 Sep 2022 14:29:21 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Sergiu Moga <sergiu.moga@...rochip.com>, lee@...nel.org,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
claudiu.beznea@...rochip.com, richard.genoud@...il.com,
radu_nicolae.pirea@....ro, gregkh@...uxfoundation.org,
broonie@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
jirislaby@...nel.org, admin@...iphile.com,
kavyasree.kotagiri@...rochip.com, tudor.ambarus@...rochip.com
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
linux-serial@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 05/13] dt-bindings: serial: atmel,at91-usart: convert
to json-schema
On 06/09/2022 15:55, Sergiu Moga wrote:
> Convert at91 USART DT Binding for Atmel/Microchip SoCs to
> json-schema format. Furthermore, move this binding to the
> serial directory, since binding directories match hardware,
> unlike the driver subsystems which match Linux convention.
>
> Signed-off-by: Sergiu Moga <sergiu.moga@...rochip.com>
> ---
>
>
>
> v1 -> v2:
> - only do what the commit says, split the addition of other compatibles and
> properties in other patches
> - remove unnecessary "|"'s
> - mention header in `atmel,usart-mode`'s description
> - place `if:` under `allOf:`
> - respect order of spi0's DT properties: compatible, then reg then the reset of properties
>
>
>
>
>
> .../devicetree/bindings/mfd/atmel-usart.txt | 98 ----------
> .../bindings/serial/atmel,at91-usart.yaml | 183 ++++++++++++++++++
> 2 files changed, 183 insertions(+), 98 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-usart.txt
> create mode 100644 Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml
>
> diff --git a/Documentation/devicetree/bindings/mfd/atmel-usart.txt b/Documentation/devicetree/bindings/mfd/atmel-usart.txt
> deleted file mode 100644
> index a09133066aff..000000000000
> --- a/Documentation/devicetree/bindings/mfd/atmel-usart.txt
> +++ /dev/null
> @@ -1,98 +0,0 @@
> -* Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
> -
> -Required properties for USART:
> -- compatible: Should be one of the following:
> - - "atmel,at91rm9200-usart"
> - - "atmel,at91sam9260-usart"
> - - "microchip,sam9x60-usart"
> - - "atmel,at91rm9200-dbgu", "atmel,at91rm9200-usart"
> - - "atmel,at91sam9260-dbgu", "atmel,at91sam9260-usart"
> - - "microchip,sam9x60-dbgu", "microchip,sam9x60-usart"
> -- reg: Should contain registers location and length
> -- interrupts: Should contain interrupt
> -- clock-names: tuple listing input clock names.
> - Required elements: "usart"
> -- clocks: phandles to input clocks.
> -
> -Required properties for USART in SPI mode:
> -- #size-cells : Must be <0>
> -- #address-cells : Must be <1>
> -- cs-gpios: chipselects (internal cs not supported)
> -- atmel,usart-mode : Must be <AT91_USART_MODE_SPI> (found in dt-bindings/mfd/at91-usart.h)
> -
> -Optional properties in serial and SPI mode:
> -- dma bindings for dma transfer:
> - - dmas: DMA specifier, consisting of a phandle to DMA controller node,
> - memory peripheral interface and USART DMA channel ID, FIFO configuration.
> - The order of DMA channels is fixed. The first DMA channel must be TX
> - associated channel and the second one must be RX associated channel.
> - Refer to dma.txt and atmel-dma.txt for details.
> - - dma-names: "tx" for TX channel.
> - "rx" for RX channel.
> - The order of dma-names is also fixed. The first name must be "tx"
> - and the second one must be "rx" as in the examples below.
> -
> -Optional properties in serial mode:
> -- atmel,use-dma-rx: use of PDC or DMA for receiving data
> -- atmel,use-dma-tx: use of PDC or DMA for transmitting data
> -- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD line respectively.
> - It will use specified PIO instead of the peripheral function pin for the USART feature.
> - If unsure, don't specify this property.
> -- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
> - capable USARTs.
> -- rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt
> -
> -<chip> compatible description:
> -- at91rm9200: legacy USART support
> -- at91sam9260: generic USART implementation for SAM9 SoCs
> -
> -Example:
> -- use PDC:
> - usart0: serial@...8c000 {
> - compatible = "atmel,at91sam9260-usart";
> - reg = <0xfff8c000 0x4000>;
> - interrupts = <7>;
> - clocks = <&usart0_clk>;
> - clock-names = "usart";
> - atmel,use-dma-rx;
> - atmel,use-dma-tx;
> - rts-gpios = <&pioD 15 GPIO_ACTIVE_LOW>;
> - cts-gpios = <&pioD 16 GPIO_ACTIVE_LOW>;
> - dtr-gpios = <&pioD 17 GPIO_ACTIVE_LOW>;
> - dsr-gpios = <&pioD 18 GPIO_ACTIVE_LOW>;
> - dcd-gpios = <&pioD 20 GPIO_ACTIVE_LOW>;
> - rng-gpios = <&pioD 19 GPIO_ACTIVE_LOW>;
> - };
> -
> -- use DMA:
> - usart0: serial@...1c000 {
> - compatible = "atmel,at91sam9260-usart";
> - reg = <0xf001c000 0x100>;
> - interrupts = <12 4 5>;
> - clocks = <&usart0_clk>;
> - clock-names = "usart";
> - atmel,use-dma-rx;
> - atmel,use-dma-tx;
> - dmas = <&dma0 2 0x3>,
> - <&dma0 2 0x204>;
> - dma-names = "tx", "rx";
> - atmel,fifo-size = <32>;
> - };
> -
> -- SPI mode:
> - #include <dt-bindings/mfd/at91-usart.h>
> -
> - spi0: spi@...1c000 {
> - #address-cells = <1>;
> - #size-cells = <0>;
> - compatible = "atmel,at91rm9200-usart", "atmel,at91sam9260-usart";
> - atmel,usart-mode = <AT91_USART_MODE_SPI>;
> - reg = <0xf001c000 0x100>;
> - interrupts = <12 IRQ_TYPE_LEVEL_HIGH 5>;
> - clocks = <&usart0_clk>;
> - clock-names = "usart";
> - dmas = <&dma0 2 AT91_DMA_CFG_PER_ID(3)>,
> - <&dma0 2 (AT91_DMA_CFG_PER_ID(4) | AT91_DMA_CFG_FIFOCFG_ASAP)>;
> - dma-names = "tx", "rx";
> - cs-gpios = <&pioB 3 0>;
> - };
> diff --git a/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml b/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml
> new file mode 100644
> index 000000000000..b25535b7a4d2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/atmel,at91-usart.yaml
> @@ -0,0 +1,183 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/serial/atmel,at91-usart.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
> +
> +maintainers:
> + - Richard Genoud <richard.genoud@...il.com>
> +
> +properties:
> + compatible:
> + oneOf:
> + - enum:
> + - atmel,at91rm9200-usart
> + - atmel,at91sam9260-usart
> + - microchip,sam9x60-usart
> + - items:
> + - const: atmel,at91rm9200-dbgu
> + - const: atmel,at91rm9200-usart
> + - items:
> + - const: atmel,at91sam9260-dbgu
> + - const: atmel,at91sam9260-usart
> + - items:
> + - const: microchip,sam9x60-dbgu
> + - const: microchip,sam9x60-usart
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + clock-names:
> + const: usart
> +
> + clocks:
> + maxItems: 1
> +
> + dmas:
> + items:
> + - description: TX DMA Channel
> + - description: RX DMA Channel
> +
> + dma-names:
> + items:
> + - const: tx
> + - const: rx
> +
> + atmel,usart-mode:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Must be either <AT91_USART_MODE_SPI> for SPI or
> + <AT91_USART_MODE_SERIAL> for USART (found in dt-bindings/mfd/at91-usart.h).
> + enum: [ 0, 1 ]
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - clock-names
> + - clocks
> +
> +allOf:
> + - if:
> + properties:
> + $nodename:
> + pattern: "^serial@[0-9a-f]+$"
You should rather check value of atmel,usart-mode, because now you won't
properly match device nodes called "foobar". Since usart-mode has only
two possible values, this will nicely simplify you if-else.
> + then:
> + allOf:
> + - $ref: /schemas/serial/serial.yaml#
> + - $ref: /schemas/serial/rs485.yaml#
> +
> + properties:
> + atmel,use-dma-rx:
> + type: boolean
> + description: use of PDC or DMA for receiving data
> +
> + atmel,use-dma-tx:
> + type: boolean
> + description: use of PDC or DMA for transmitting data
> +
> + atmel,fifo-size:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Maximum number of data the RX and TX FIFOs can store for FIFO
> + capable USARTS.
> + enum: [ 16, 32 ]
I did not mention it last time, but I think it should follow generic
practice, so define all properties top-level and disallow them for other
type. This allows you to simply use additionalProperties:false at the end.
> +
> + else:
> + if:
> + properties:
> + $nodename:
> + pattern: "^spi@[0-9a-f]+$"
> + then:
> + allOf:
> + - $ref: /schemas/spi/spi-controller.yaml#
> +
> + properties:
> + atmel,usart-mode:
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + "#address-cells":
> + const: 1
The same - top level and disallow them for uart.
> +
> + required:
> + - atmel,usart-mode
> + - "#size-cells"
> + - "#address-cells"
End else in this branch is what?
> +
> +unevaluatedProperties: false
> +
Best regards,
Krzysztof
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