linux-kernel - Re: [PATCH] dt-bindings: serial: Describe ARM dcc interface

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Date: Fri, 22 Dec 2023 09:20:09 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Michal Simek <michal.simek@....com>, linux-kernel@...r.kernel.org,
 monstr@...str.eu, michal.simek@...inx.com, git@...inx.com
Cc: Conor Dooley <conor+dt@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
 linux-serial@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: serial: Describe ARM dcc interface

On 21/12/2023 15:05, Michal Simek wrote:
> Debug Communication Channel (DCC) provides the way how to pass data between
> target CPU and host via JTAG interface. Every CPU has own interface for
> communication via dbgdtrtx_el0 and dbgdtrrx_el0 registers.
> 
> Signed-off-by: Michal Simek <michal.simek@....com>
> ---
> 
> This communication interface is used for flash programming on Xilinx
> SOCs from U-Boot.
> https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/serial/arm_dcc.c
> 
> ---
>  .../devicetree/bindings/serial/arm,dcc.yaml   | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/serial/arm,dcc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/serial/arm,dcc.yaml b/Documentation/devicetree/bindings/serial/arm,dcc.yaml
> new file mode 100644
> index 000000000000..fd0589356617
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/arm,dcc.yaml
> @@ -0,0 +1,30 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/serial/arm,dcc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ARM DCC (Data communication channel) serial emulation
> +
> +maintainers:
> +  - Michal Simek <michal.simek@....com>
> +
> +description: |
> +  ARM DCC (Data communication channel) serial emulation interface available
> +  via JTAG can be also used as one of serial line tightly coupled with every
> +  ARM CPU available in the system.
> +
> +properties:
> +  compatible:
> +    const: arm,dcc
> +
> +required:
> +  - compatible

no allOf: with $ref to serial.yaml? Does it differ somehow?

Best regards,
Krzysztof