linux-kernel - [PATCH 1/2] dt-bindings: mailbox: add STMicroelectronics STM32 IPCC binding

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Message-ID: <1519824270-7134-2-git-send-email-fabien.dessenne@st.com>
Date:   Wed, 28 Feb 2018 14:24:29 +0100
From:   Fabien Dessenne <fabien.dessenne@...com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        "Ludovic Barre" <ludovic.barre@...com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Loic Pallardy <loic.pallardy@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>
Subject: [PATCH 1/2] dt-bindings: mailbox: add STMicroelectronics STM32 IPCC binding

Add a binding for the STMicroelectronics STM32 IPCC block exposing a
mailbox mechanism between two processors.

Signed-off-by: Fabien Dessenne <fabien.dessenne@...com>
Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 .../devicetree/bindings/mailbox/stm32-ipcc.txt     | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt

diff --git a/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt
new file mode 100644
index 0000000..2321689
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt
@@ -0,0 +1,48 @@
+* STMicroelectronics STM32 IPCC (Inter-Processor Communication Controller)
+
+The IPCC block provides a non blocking signaling mechanism to post and
+retrieve messages in an atomic way between two processors.
+It provides the signaling for N bidirectionnal channels. The number of channels
+(N) can be read from a dedicated register.
+
+Required properties:
+- compatible:   Must be "st,stm32-ipcc"
+- reg:          Register address range (base address and length)
+- st,proc_id:   Processor id using the mailbox (0 or 1)
+- clocks:       Input clock
+- interrupt-names: List of names for the interrupts described by the interrupt
+                   property. Must contain the following entries:
+                   - "rx"
+                   - "tx"
+- interrupts:   Interrupt specifiers for "rx channel occupied" and "tx channel
+                free"
+- #mbox-cells:  Number of cells required for the mailbox specifier. Must be 1.
+                The data contained in the mbox specifier of the "mboxes"
+                property in the client node is the mailbox channel index.
+
+Optional properties:
+- wakeup-source: Flag to indicate whether this device can wake up the system
+- interrupts:    Wakeup interrupt used to wake up the system.
+- interrupt-names: "wakeup" for the wakeup interrupt.
+
+
+
+Example:
+	ipcc: mailbox@...01000 {
+		compatible = "st,stm32-ipcc";
+		#mbox-cells = <1>;
+		reg = <0x4c001000 0x400>;
+		st,proc_id = <0>;
+		interrupts-extended = <&intc GIC_SPI 100 IRQ_TYPE_NONE>,
+				      <&intc GIC_SPI 101 IRQ_TYPE_NONE>,
+				      <&aiec 62 1>;
+		interrupt-names = "rx", "tx", "wakeup";
+		clocks = <&rcc_clk IPCC>;
+		wakeup-source;
+	}
+
+Client:
+	mbox_test {
+		...
+		mboxes = <&ipcc 0>, <&ipcc 1>;
+	};
-- 
2.7.4