The kernel communicates with the E902 core through the mailbox transport using AON firmware protocol. Add dt-bindings to document it the dt node. Signed-off-by: Michal Wilczynski <m.wilczynski@xxxxxxxxxxx> --- .../bindings/firmware/thead,th1520-aon.yaml | 59 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml diff --git a/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml b/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml new file mode 100644 index 000000000000..ca4c276766a3 --- /dev/null +++ b/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml @@ -0,0 +1,59 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/firmware/thead,th1520-aon.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: T-HEAD TH1520 AON (Always-On) Firmware Node + +description: | + The Always-On (AON) subsystem in the TH1520 SoC is responsible for managing + low-power states, system wakeup events, and power management tasks. It is + designed to operate independently in a dedicated power domain, allowing it to + remain functional even during the SoC's deep sleep states. + + At the heart of the AON subsystem is the E902, a low-power core that executes + firmware responsible for coordinating tasks such as power domain control, + clock management, and system wakeup signaling. Communication between the main + SoC and the AON subsystem is handled through a mailbox interface, which + enables message-based interactions with the AON firmware. + +maintainers: + - Michal Wilczynski <m.wilczynski@xxxxxxxxxxx> + +properties: + compatible: + const: thead,th1520-aon + + mboxes: + maxItems: 1 + + mbox-names: + items: + - const: aon + + power-domain: + $ref: /schemas/power/thead,th1520-power.yaml# + description: Subnode representing the hardware power domain of the AON subsystem. + +additionalProperties: false + +required: + - compatible + - mboxes + - mbox-names + +examples: + - | + firmware { + aon: aon { + compatible = "thead,th1520-aon"; + mboxes = <&mbox_910t 1>; + mbox-names = "aon"; + + pd: power-domain { + compatible = "thead,th1520-pd"; + #power-domain-cells = <1>; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index c0e9639ac210..7705d1b6dd7a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20188,6 +20188,7 @@ M: Fu Wei <wefu@xxxxxxxxxx> L: linux-riscv@xxxxxxxxxxxxxxxxxxx S: Maintained T: git https://github.com/pdp7/linux.git +F: Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml F: Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml F: Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml F: Documentation/devicetree/bindings/net/thead,th1520-gmac.yaml -- 2.34.1
