linux-kernel - Re: [PATCH 2/3] dt-bindings: mailbox: starfive: Add StarFive Meu Mailbox Driver

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Date: Tue, 19 Dec 2023 13:52:53 +0800
From: Joshua Yeong <joshua.yeong@...rfivetech.com>
To: Conor Dooley <conor@...nel.org>
CC: <jeeheng.sia@...rfivetech.com>, <leyfoon.tan@...rfivetech.com>,
	<jassisinghbrar@...il.com>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: mailbox: starfive: Add StarFive Meu
 Mailbox Driver


On 18/12/2023 7:17 PM, Conor Dooley wrote:
> On Mon, Dec 18, 2023 at 02:12:00PM +0800, Joshua Yeong wrote:
>> The StarFive Meu Mailbox allow communication between AP and SCP cores
>> through mailbox doorbell.
>>
>> Co-developed-by: Sia Jee Heng <jeeheng.sia@...rfivetech.com>
>> Signed-off-by: Sia Jee Heng <jeeheng.sia@...rfivetech.com>
>> Signed-off-by: Joshua Yeong <joshua.yeong@...rfivetech.com>
>> Reviewed-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
>> ---
>>   .../bindings/mailbox/starfive-meu.yaml        | 66 +++++++++++++++++++
>>   1 file changed, 66 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/mailbox/starfive-meu.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/mailbox/starfive-meu.yaml b/Documentation/devicetree/bindings/mailbox/starfive-meu.yaml
>> new file mode 100644
>> index 000000000000..dbc5cfdb90ff
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mailbox/starfive-meu.yaml
>> @@ -0,0 +1,66 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mailbox/starfive-meu.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: StarFive MEU Mailbox Controller
>> +
>> +maintainers:
>> +  - Jee Heng Sia <jeeheng.sia@...rfivetech.com>
>> +  - Joshua Yeong <joshua.yeong@...rfivetech.com>
>> +
>> +description: |
>> +  StarFive's Message-Exchange-Unit (MEU) is a mailbox controller that has 62
>> +  independent doorbells. Each MEU channel consist of 31 doorbells and consist of
>> +  a pair of Tx/Rx links that shall communicates with remote processor. The
>> +  sender set the bit in the SET register to indicate data readiness for the
>> +  receiver. An interrupt will be raised whenever receiving notification doorbell
>> +  from remote processor. The receiver will clear the bit in the CLR register
>> +  upon handling the doorbell notification. The sender should poll the STAT
>> +  register before starting any transaction to ensure all on-going doorbells are
>> +  processed.
> What is/are the consumer(s) of this mailbox?
> Is part of your RPMI implementation?
>
> Cheers,
> Conor.

Yes, it would be part of StarFive RPMI implementation.

Regards,
Joshua

>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - starfive,jh8100-meu
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    items:
>> +      - description: mailbox0
>> +      - description: mailbox1
>> +
>> +  '#mbox-cells':
>> +    description: represents index of the mailbox/doorbell paired channel
>> +      channel  0 - 30 for mailbox0 doorbell
>> +      channel 31 - 61 for mailbox1 doorbell
>> +    const: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - '#mbox-cells'
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    soc {
>> +        #address-cells = <2>;
>> +        #size-cells = <2>;
>> +
>> +        meu: mailbox@...70000 {
>> +            compatible = "starfive,jh8100-meu";
>> +            reg = <0x0 0x1f370000 0 0x8000>;
>> +            interrupts = <170>, /* Mailbox0 */
>> +                         <171>; /* Mailbox1 */
>> +            #mbox-cells = <1>;
>> +        };
>> +    };
>> +
>> +...
>> -- 
>> 2.25.1
>>