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@xxxxxxxxxxxxxxxx>
Signed-off-by: Sia Jee Heng <jeeheng.sia@xxxxxxxxxxxxxxxx>
Signed-off-by: Joshua Yeong <joshua.yeong@xxxxxxxxxxxxxxxx>
Reviewed-by: Ley Foon Tan <leyfoon.tan@xxxxxxxxxxxxxxxx>
---
.../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@xxxxxxxxxxxxxxxx>
+ - Joshua Yeong <joshua.yeong@xxxxxxxxxxxxxxxx>
+
+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
