[PATCH 1/3] dt-bindings: mailbox: add Sophgo cv18x SoCs mailbox

[Yuntao Dai]

Hi Inochi,

Sorry for replying late, I have been waiting for the vendor to make 
their mailbox document public, but they haven't done it yet.

On Wed, Jun 19, 2024 at 6:45 AM, Inochi Amaoto <inochiama at outlook.com> 
wrote:
> On Tue, Jun 18, 2024 at 11:12:33PM GMT, Yuntao Dai wrote:
>>  Add devicetree bindings documentation for Sophgo cv18x SoCs mailbox
>> 
>>  Signed-off-by: Yuntao Dai <d1581209858 at live.com>
>>  ---
>>   .../mailbox/sophgo,cv1800b-mailbox.yaml       | 75 
>> +++++++++++++++++++
>>   1 file changed, 75 insertions(+)
>>   create mode 100644 
>> Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml
>> 
>>  diff --git 
>> a/Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml 
>> b/Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml
>>  new file mode 100644
>>  index 000000000..e1868aaf2
>>  --- /dev/null
>>  +++ 
>> b/Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml
>>  @@ -0,0 +1,75 @@
>>  +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>  +%YAML 1.2
>>  +---
>>  +$id: 
>> http://devicetree.org/schemas/mailbox/sophgo,cv1800b-mailbox.yaml#
>>  +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>  +
>>  +title: Sophgo cv1800b mailbox controller
>>  +
>>  +maintainers:
>>  +  - Yuntao Dai <d1581209858 at live.com>
>>  +
>>  +description:
>>  +  The Sophgo cv18x SoCs mailbox has 8 channels and 8 bytes per 
>> channel for
>>  +  different processors. Any processer can write data in a channel, 
>> and
>>  +  set co-responding register to raise interrupt to notice another 
>> processor,
>>  +  and it is allowed to send data to itself.
>>  +  Sophgo cv18x SoCs has 3 processors and numbered as
>>  +  <1> C906L
>>  +  <2> C906B
>>  +  <3> 8051
> 
> Are you sure the 8051 use the same mailbox layout?
> IIRC, only the small core use this mailbox.

Yes, I am sure of this, and cv18xx SoCs and sg200x SoCs share the same 
mailbox IP

>>  +
>>  +properties:
>>  +  compatible:
>>  +    enum:
>>  +      - sophgo,cv1800b-mailbox
>>  +
>>  +  reg:
>>  +    maxItems: 1
>>  +
>>  +  interrupts:
>>  +    maxItems: 1
>>  +
>>  +  interrupt-names:
>>  +    const: mailbox
>>  +
>>  +  recvid:
>>  +    maxItems: 1
>>  +    description:
>>  +      This cell indicates the mailbox controller is running on 
>> which processor
>>  +
>>  +  sendto:
>>  +    maxItems: 1
>>  +    description:
>>  +      This cell indicates the message sends to which processor
>>  +
>>  +
>>  +  "#mbox-cells":
>>  +    const: 1
>>  +    description:
>>  +      This cell indicates which channel is used
>>  +
>>  +required:
>>  +  - compatible
>>  +  - reg
>>  +  - interrupts
>>  +  - recvid
>>  +  - sendto
>>  +  - "#mbox-cells"
>>  +
>>  +additionalProperties: false
>>  +
>>  +examples:
>>  +  - |
>>  +    #include <dt-bindings/interrupt-controller/irq.h>
>>  +
>>  +    mailbox: mailbox at 1900000 {
>>  +        compatible = "sophgo,cv1800b-mailbox";
>>  +        reg = <0x01900000 0x1000>;
>>  +        interrupts = <101 IRQ_TYPE_LEVEL_HIGH>;
>>  +        interrupt-names = "mailbox";
>>  +        interrupt-parent = <&plic>;
>>  +        recvid = <1>;
>>  +        sendto = <2>;
>>  +        #mbox-cells = <1>;
>>  +    };
>>  --
>>  2.17.1
>>