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SubjectRe: [PATCH 2/3] dt-bindings: mailbox: starfive: Add StarFive Meu Mailbox Driver
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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@starfivetech.com>
>> Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
>> Signed-off-by: Joshua Yeong <joshua.yeong@starfivetech.com>
>> Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.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@starfivetech.com>
>> + - Joshua Yeong <joshua.yeong@starfivetech.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@1f370000 {
>> + compatible = "starfive,jh8100-meu";
>> + reg = <0x0 0x1f370000 0 0x8000>;
>> + interrupts = <170>, /* Mailbox0 */
>> + <171>; /* Mailbox1 */
>> + #mbox-cells = <1>;
>> + };
>> + };
>> +
>> +...
>> --
>> 2.25.1
>>

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