On Wed, Feb 28, 2018 at 02:24:29PM +0100, Fabien Dessenne wrote:
> Add a binding for the STMicroelectronics STM32 IPCC block exposing a
> mailbox mechanism between two processors.
>
> Signed-off-by: Fabien Dessenne <fabien.dessenne@xxxxxx>
> Signed-off-by: Ludovic Barre <ludovic.barre@xxxxxx>
> ---
> .../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"
Kind of generic. There's only 1 version of h/w across all stm32 parts?
> +- reg: Register address range (base address and length)
> +- st,proc_id: Processor id using the mailbox (0 or 1)
s/_/-/
> +- 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.
Make these required. "wakeup-source" alone determines if you use it.
> +
> +
> +
> +Example:
> + ipcc: mailbox@4c001000 {
> + 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
>
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