2018-03-06 1:57 GMT+01:00 Rob Herring <robh@xxxxxxxxxx>:
> 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?
>
We can check the version in one of the hardware block register.
I guess in this case we can have this kind of generic compatible, right ?
Benjamin
>> +- 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
>>
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
