From e4067b75fb6ca83a58b2c342a0b3ee12e1223c4e Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 21 Jun 2018 13:44:30 +0200 Subject: dts: update to v4.18-rc1 Signed-off-by: Sascha Hauer --- dts/Bindings/mailbox/stm32-ipcc.txt | 47 +++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 dts/Bindings/mailbox/stm32-ipcc.txt (limited to 'dts/Bindings/mailbox/stm32-ipcc.txt') diff --git a/dts/Bindings/mailbox/stm32-ipcc.txt b/dts/Bindings/mailbox/stm32-ipcc.txt new file mode 100644 index 0000000000..1d2b7fee7b --- /dev/null +++ b/dts/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>; + }; -- cgit v1.2.3