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Message-ID: <de6370c5-5cd1-409a-8716-99dd7738d30d@linaro.org>
Date: Fri, 22 Dec 2023 09:20:09 +0100
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Subject: Re: [PATCH] dt-bindings: serial: Describe ARM dcc interface
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To: Michal Simek <michal.simek@amd.com>, linux-kernel@vger.kernel.org,
 monstr@monstr.eu, michal.simek@xilinx.com, git@xilinx.com
Cc: Conor Dooley <conor+dt@kernel.org>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Jiri Slaby <jirislaby@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
 linux-serial@vger.kernel.org
References: <9d7e85914eb1cdb313b28cb019093a84dd9b4773.1703167505.git.michal.simek@amd.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <9d7e85914eb1cdb313b28cb019093a84dd9b4773.1703167505.git.michal.simek@amd.com>
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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@amd.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@amd.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