linux-kernel - Re: [PATCH v4 2/3] dt-bindings: mailbox: Add thead,th1520-mailbox bindings

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Message-ID: <54fd467b-8077-454f-ae6c-14bb782cbe3a@kernel.org>
Date: Wed, 16 Oct 2024 08:31:23 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Samuel Holland <samuel.holland@...ive.com>,
 Michal Wilczynski <m.wilczynski@...sung.com>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, drew@...7.com,
 guoren@...nel.org, wefu@...hat.com, jassisinghbrar@...il.com,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu,
 m.szyprowski@...sung.com
Subject: Re: [PATCH v4 2/3] dt-bindings: mailbox: Add thead,th1520-mailbox
 bindings

On 16/10/2024 01:14, Samuel Holland wrote:
>> +  reg-names:
>> +    items:
>> +      - const: local
>> +      - const: remote-icu0
>> +      - const: remote-icu1
>> +      - const: remote-icu2
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  '#mbox-cells':
>> +    const: 2
>> +    description: |
>> +      Specifies the number of cells needed to encode the mailbox specifier.
>> +      The mailbox specifier consists of two cells:
>> +        - Destination CPU ID.
>> +        - Type, which can be one of the following:
>> +            - 0:
>> +                - TX & RX channels share the same channel.
>> +                - Equipped with 7 info registers to facilitate data sharing.
>> +                - Supports IRQ for signaling.
>> +            - 1:
>> +                - TX & RX operate as doorbell channels.
>> +                - Does not have dedicated info registers.
>> +                - Lacks ACK support.
> 
> It appears that these types are not describing hardware, but the protocol used
> by the Linux driver to glue two unidirectional hardware channels together to
> make a virtual bidirectional channel. This is really the responsibility of the
> mailbox client to know what protocol it needs, not the devicetree.
> 

Hm, where is the DTS with consumers of this mailbox provider?

Best regards,
Krzysztof