From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fabien Dessenne Subject: [PATCH v3 1/2] dt-bindings: mailbox: add STMicroelectronics STM32 IPCC binding Date: Mon, 9 Apr 2018 12:28:25 +0200 Message-ID: <1523269706-23724-2-git-send-email-fabien.dessenne@st.com> References: <1523269706-23724-1-git-send-email-fabien.dessenne@st.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1523269706-23724-1-git-send-email-fabien.dessenne@st.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Rob Herring , Mark Rutland , Maxime Coquelin , Alexandre Torgue , Jassi Brar , Ludovic Barre , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Arnaud Pouliquen , Loic Pallardy , Benjamin Gaignard List-Id: devicetree@vger.kernel.org Add a binding for the STMicroelectronics STM32 IPCC block exposing a mailbox mechanism between two processors. Signed-off-by: Fabien Dessenne Signed-off-by: Ludovic Barre --- .../devicetree/bindings/mailbox/stm32-ipcc.txt | 47 ++++++++++++++++++++++ 1 file changed, 47 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..1d2b7fe --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/stm32-ipcc.txt @@ -0,0 +1,47 @@ +* 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,stm32mp1-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" + - "wakeup" +- interrupts: Interrupt specifiers for "rx channel occupied", "tx channel + free" and "system wakeup". +- #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 + + + +Example: + ipcc: mailbox@4c001000 { + compatible = "st,stm32mp1-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