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

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Date: Tue, 2 Jan 2024 16:32:31 +0100
From: Michal Simek <michal.simek@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 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 12/22/23 09:20, Krzysztof Kozlowski wrote:
> 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?

Valid one could be only nodename format and maybe label.
Others are not relevant. But if that's fine I can also add it.

Thanks,
Michal