[PATCH 2/3] mailbox: dt: Supply bindings for ST's Mailbox IP

[Lee Jones]

Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
 .../devicetree/bindings/mailbox/sti-mailbox.txt    | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/sti-mailbox.txt

diff --git a/Documentation/devicetree/bindings/mailbox/sti-mailbox.txt b/Documentation/devicetree/bindings/mailbox/sti-mailbox.txt
new file mode 100644
index 0000000..c965c13
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/sti-mailbox.txt
@@ -0,0 +1,66 @@
+ST Microelectronics Mailbox Driver
+
+Required properties:
+- compatible		: Should be "st,stih407-mailbox"
+- reg			: Offset and length of the register set for the device
+- reg-names		: Should contain the reg name "mbox-reg".
+- st,name		: Name of the mailbox
+- st,mbox-chans		: Mbox/channels descriptor data private to each channel.
+			  The 4 cells represent the following data:
+				Cell #1 (rx_id) - rx mbox num in an instance.
+				Cell #2 (rx_inst) - rx mbox instance num.
+				Cell #3 (tx_id) - tx mbox num in an instance.
+				Cell #4 (tx_inst) - tx mbox instance num.
+
+			  Note that an IP Mailbox is composed by 4 instances and
+			  each instance is composed by 32 mailboxes.
+			  You define here the configuration of a channel (at
+			  framework level).
+
+Optional properties
+- st,mbox-rx		: Indicaties if the mailbox can be used as Rx mailbox.
+- st,mbox-rx-id		: If a Rx mailbox is affected to a Tx mailbox (to have
+			  full-duplex channel), this field indiactes the Id of
+			  the Rx mailbox to use.
+- interrupts		: Contains the IRQ line for a RX mailbox.
+- interrupt-names	: Should contain the interrupt name.
+
+Examples:
+
+mailbox0: mailbox@0 {
+	compatible = "st,stih407-mailbox";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	#mbox-cells = <1>;
+	reg = <0x8f00000 0x1000>;
+	reg-names = "mbox-reg";
+	interrupts = <GIC_SPI 1 IRQ_TYPE_NONE>;
+	interrupt-names = "mb0_irq";
+	st,name = "a9";
+	st,mbox-rx;
+	st,mbox-rx-id = <0>;
+	st,mbox-chans = <0 1 0 1>;
+};
+
+mailbox3: mailbox@3 {
+	compatible = "st,stih407-mailbox";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	#mbox-cells = <1>;
+	reg = <0x8f03000 0x100>;
+	reg-names = "mbox-reg";
+	st,name = "st231_video";
+	st,mbox-rx-id = <0>;
+	st,mbox-chans = <2 1 2 1>;
+};
+
+In this configuration, if you use channel 0 you will have the following
+configuration:
+- "chan0_video" will use mailbox0 as Rx mailbox.
+- "chan0_video" will use instance 1, bit 2 in mailbox0 for rx.
+- "chan0_video" will use instance 1, bit 2 in mailbox3 for tx.
+
+If you declare a channel only for Rx, you have to set magic number 0xff
+for tx_id and tx_instance.
+If you declare a channel only for Tx, you have to set magic number 0xff
+for rx_id and rx_instance.
-- 
1.9.1

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