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. + +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
