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Mon, 25 Oct 2021 02:22:14 -0400 (EDT) From: Sven Peter To: Jassi Brar Cc: Sven Peter , Rob Herring , Mark Kettenis , Hector Martin , Alyssa Rosenzweig , Mohamed Mediouni , Stan Skowronek , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Kettenis , Rob Herring Subject: [PATCH v4 2/3] dt-bindings: mailbox: Add Apple mailbox bindings Date: Mon, 25 Oct 2021 08:22:03 +0200 Message-Id: <20211025062204.1517-3-sven@svenpeter.dev> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20211025062204.1517-1-sven@svenpeter.dev> References: <20211025062204.1517-1-sven@svenpeter.dev> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211024_232218_355699_DF412964 X-CRM114-Status: GOOD ( 16.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Apple mailbox controller are found on the M1 and are used for communication with various co-processors. Reviewed-by: Mark Kettenis Reviewed-by: Rob Herring Signed-off-by: Sven Peter --- .../bindings/mailbox/apple,mailbox.yaml | 77 +++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml diff --git a/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml b/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml new file mode 100644 index 000000000000..2c1704b34e7a --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml @@ -0,0 +1,77 @@ +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mailbox/apple,mailbox.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple Mailbox Controller + +maintainers: + - Hector Martin + - Sven Peter + +description: + The Apple mailbox consists of two FIFOs used to exchange 64+32 bit + messages between the main CPU and a co-processor. Multiple instances + of this mailbox can be found on Apple SoCs. + One of the two FIFOs is used to send data to a co-processor while the other + FIFO is used for the other direction. + Various clients implement different IPC protocols based on these simple + messages and shared memory buffers. + +properties: + compatible: + oneOf: + - description: + ASC mailboxes are the most common variant found on the M1 used + for example for the display controller, the system management + controller and the NVMe coprocessor. + items: + - const: apple,t8103-asc-mailbox + + - description: + M3 mailboxes are an older variant with a slightly different MMIO + interface still found on the M1. It is used for the Thunderbolt + co-processors. + items: + - const: apple,t8103-m3-mailbox + + reg: + maxItems: 1 + + interrupts: + items: + - description: send fifo is empty interrupt + - description: send fifo is not empty interrupt + - description: receive fifo is empty interrupt + - description: receive fifo is not empty interrupt + + interrupt-names: + items: + - const: send-empty + - const: send-not-empty + - const: recv-empty + - const: recv-not-empty + + "#mbox-cells": + const: 0 + +required: + - compatible + - reg + - interrupts + - interrupt-names + - "#mbox-cells" + +additionalProperties: false + +examples: + - | + mailbox@77408000 { + compatible = "apple,t8103-asc-mailbox"; + reg = <0x77408000 0x4000>; + interrupts = <1 583 4>, <1 584 4>, <1 585 4>, <1 586 4>; + interrupt-names = "send-empty", "send-not-empty", + "recv-empty", "recv-not-empty"; + #mbox-cells = <0>; + };