Date:   Mon, 17 Aug 2020 20:17:52 -0600
From:   Rob Herring <robh@...nel.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     mturquette@...libre.com, sboyd@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        gregkh@...uxfoundation.org, galak@...eaurora.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH V2 4/5] dt-bindings: serial: Convert MXS auart to
 json-schema

On Wed, Aug 12, 2020 at 04:51:23PM +0800, Anson Huang wrote:
> Convert the MXS auart binding to DT schema format using json-schema.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> changes since V1:
> 	- update examples to align with i.MX23/i.MX28 clock bindings;
> 	- add minItem to clocks/clock-names property as i.MX23/i.MX28 have optional clocks
> 	  property with one item.
> ---
>  .../devicetree/bindings/serial/fsl-mxs-auart.txt   | 53 -------------
>  .../devicetree/bindings/serial/fsl-mxs-auart.yaml  | 91 ++++++++++++++++++++++
>  2 files changed, 91 insertions(+), 53 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
>  create mode 100644 Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml
> 
> diff --git a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
> deleted file mode 100644
> index 5c96d41..0000000
> --- a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
> +++ /dev/null
> @@ -1,53 +0,0 @@
> -* Freescale MXS Application UART (AUART)
> -
> -Required properties for all SoCs:
> -- compatible : Should be one of fallowing variants:
> -	"fsl,imx23-auart" - Freescale i.MX23
> -	"fsl,imx28-auart" - Freescale i.MX28
> -	"alphascale,asm9260-auart" - Alphascale ASM9260
> -- reg : Address and length of the register set for the device
> -- interrupts : Should contain the auart interrupt numbers
> -- dmas: DMA specifier, consisting of a phandle to DMA controller node
> -  and AUART DMA channel ID.
> -  Refer to dma.txt and fsl-mxs-dma.txt for details.
> -- dma-names: "rx" for RX channel, "tx" for TX channel.
> -
> -Required properties for "alphascale,asm9260-auart":
> -- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt
> -- clock-names : should be set to
> -	"mod" - source for tick counter.
> -	"ahb" - ahb gate.
> -
> -Optional properties:
> -- uart-has-rtscts : Indicate the UART has RTS and CTS lines
> -  for hardware flow control,
> -	it also means you enable the DMA support for this UART.
> -- {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.
> -
> -Example:
> -auart0: serial@...6a000 {
> -	compatible = "fsl,imx28-auart", "fsl,imx23-auart";
> -	reg = <0x8006a000 0x2000>;
> -	interrupts = <112>;
> -	dmas = <&dma_apbx 8>, <&dma_apbx 9>;
> -	dma-names = "rx", "tx";
> -	cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
> -	dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
> -	dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
> -};
> -
> -Note: Each auart port should have an alias correctly numbered in "aliases"
> -node.
> -
> -Example:
> -
> -aliases {
> -	serial0 = &auart0;
> -	serial1 = &auart1;
> -	serial2 = &auart2;
> -	serial3 = &auart3;
> -	serial4 = &auart4;
> -};
> diff --git a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml
> new file mode 100644
> index 0000000..5c4fa75
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/serial/fsl-mxs-auart.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale MXS Application UART (AUART)
> +
> +maintainers:
> +  - Kumar Gala <galak@...eaurora.org>

Why is Kumar maintainer and that's a really old email address?

> +
> +allOf:
> +  - $ref: "serial.yaml"
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,imx23-auart
> +      - fsl,imx28-auart
> +      - alphascale,asm9260-auart
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  dmas:
> +    items:
> +      - description: DMA controller phandle and request line for RX
> +      - description: DMA controller phandle and request line for TX
> +
> +  dma-names:
> +    items:
> +      - const: rx
> +      - const: tx
> +
> +  clocks:
> +    items:
> +      - description: mod clock
> +      - description: ahb clock
> +    minItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: mod
> +      - const: ahb
> +    minItems: 1
> +
> +  uart-has-rtscts: true
> +  rts-gpios: true
> +  cts-gpios: true
> +  dtr-gpios: true
> +  dsr-gpios: true
> +  rng-gpios: true
> +  dcd-gpios: true
> +
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - alphascale,asm9260-auart
> +then:
> +  required:
> +    - clocks
> +    - clock-names
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - dmas
> +  - dma-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    aliases {
> +        serial0 = &auart0;
> +    };
> +
> +    auart0: serial@...6a000 {
> +        compatible = "fsl,imx28-auart";
> +        reg = <0x8006a000 0x2000>;
> +        interrupts = <112>;
> +        dmas = <&dma_apbx 8>, <&dma_apbx 9>;
> +        dma-names = "rx", "tx";
> +        clocks = <&clks 45>;
> +    };
> -- 
> 2.7.4
> 

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