[PATCH v3 02/10] dt-bindings: mailbox: apple: Add DockChannel mailbox
From: Michael Reeves via B4 Relay <devnull+michael.reeves077.gmail.com@kernel.org>
Date: 2026-09-18 13:28:40
Also in:
asahi, b4-sent, linux-arm-kernel, linux-devicetree, linux-iommu, lkml
Subsystem:
mailbox api, open firmware and flattened device tree bindings, the rest · Maintainers:
Jassi Brar, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Michael Reeves <redacted> DockChannel is a FIFO and interrupt block used by Apple coprocessors to exchange byte-stream traffic with the AP. Describe it as a mailbox provider so HID and future serial clients can use the common mailbox API. Signed-off-by: Michael Reeves <redacted> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> --- .../bindings/mailbox/apple,t8112-dockchannel.yaml | 77 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 78 insertions(+)
diff --git a/Documentation/devicetree/bindings/mailbox/apple,t8112-dockchannel.yaml b/Documentation/devicetree/bindings/mailbox/apple,t8112-dockchannel.yaml
new file mode 100644
index 000000000..dd2fdfa01
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/apple,t8112-dockchannel.yaml@@ -0,0 +1,77 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mailbox/apple,t8112-dockchannel.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple DockChannel FIFO Mailbox + +maintainers: + - Michael Reeves <michael.reeves077@gmail.com> + +description: + DockChannel is a hardware FIFO and interrupt block used on Apple SoCs for + low-latency byte stream communication with co-processors. + +properties: + compatible: + oneOf: + - items: + - const: apple,t8112-dockchannel + - items: + - enum: + - apple,t6020-dockchannel + - apple,t6030-dockchannel + - apple,t6031-dockchannel + - apple,t8122-dockchannel + - const: apple,t8112-dockchannel + + reg: + items: + - description: Interrupt control registers + - description: FIFO configuration registers + - description: FIFO data registers + + reg-names: + items: + - const: irq + - const: config + - const: data + + interrupts: + maxItems: 1 + + "#mbox-cells": + const: 0 + + nonposted-mmio: true + +required: + - compatible + - reg + - reg-names + - interrupts + - "#mbox-cells" + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/apple-aic.h> + #include <dt-bindings/interrupt-controller/irq.h> + + soc { + #address-cells = <2>; + #size-cells = <2>; + + mailbox@24eb14000 { + compatible = "apple,t8112-dockchannel"; + reg = <0x2 0x4eb14000 0x0 0x4000>, + <0x2 0x4eb30000 0x0 0x4000>, + <0x2 0x4eb34000 0x0 0x4000>; + reg-names = "irq", "config", "data"; + interrupt-parent = <&aic>; + interrupts = <AIC_IRQ 850 IRQ_TYPE_LEVEL_HIGH>; + #mbox-cells = <0>; + }; + };
diff --git a/MAINTAINERS b/MAINTAINERS
index 3b2eb2a7a..0183c3e1c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS@@ -2643,6 +2643,7 @@ F: Documentation/devicetree/bindings/iommu/apple,dart.yaml F: Documentation/devicetree/bindings/iommu/apple,sart.yaml F: Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml F: Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml +F: Documentation/devicetree/bindings/mailbox/apple,t8112-dockchannel.yaml F: Documentation/devicetree/bindings/mfd/apple,smc.yaml F: Documentation/devicetree/bindings/net/bluetooth/brcm,bcm4377-bluetooth.yaml F: Documentation/devicetree/bindings/nvme/apple,nvme-ans.yaml
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2.55.0