[PATCH 1/3 v5] dt/bindings: Add binding for the BCM2835 mailbox driver

Eric Anholt eric at anholt.net
Tue Apr 28 13:44:28 PDT 2015

From: Lubomir Rintel <lkundrak at v3.sk>

Signed-off-by: Lubomir Rintel <lkundrak at v3.sk>
Signed-off-by: Craig McGeachie <slapdau at yahoo.com.au>
Signed-off-by: Eric Anholt <eric at anholt.net>
Acked-by: Lee Jones <lee.jones at linaro.org>
Acked-by: Stephen Warren <swarren at wwwdotorg.org>

v2: Split into a separate patch for submitting to the devicetree list.
    Consistently start node docs with a capital letter. device's
    address in the example shouldn't have "0x". Drop machine-specific
    interrupt numbers from the docs.  (changes by anholt).

v3: Move the file to just bcm2835-mbox.txt, clean up formatting
    (changes by anholt, from review by Lee Jones).

v4: Move file back by consensus from various Broadcom platform
    maintainers (changes by anholt, acked by Lee Jones).

v5: Document that the mailbox cell should be 0 in clients, and add an
    example of a client (changes by anholt, from review by Jassi).

 .../bindings/mailbox/brcm,bcm2835-mbox.txt         | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/brcm,bcm2835-mbox.txt

diff --git a/Documentation/devicetree/bindings/mailbox/brcm,bcm2835-mbox.txt b/Documentation/devicetree/bindings/mailbox/brcm,bcm2835-mbox.txt
new file mode 100644
index 0000000..731de34
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/brcm,bcm2835-mbox.txt
@@ -0,0 +1,27 @@
+Broadcom BCM2835 VideoCore mailbox IPC
+Required properties:
+- compatible:	Should be "brcm,bcm2835-mbox"
+- reg:		Specifies base physical address and size of the registers
+- interrupts:	The interrupt number
+		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
+- #mbox-cells:	Specifies the number of cells needed to encode a mailbox
+		  channel. The value shall be 1.  Clients should supply a value
+		  of 0 for the mailbox channel, because there is only one
+		  exposed
+mailbox: mailbox at 7e00b800 {
+	compatible = "brcm,bcm2835-mbox";
+	reg = <0x7e00b880 0x40>;
+	interrupts = <0 1>;
+	#mbox-cells = <1>;
+firmware: firmware {
+	compatible = "raspberrypi,firmware";
+	mboxes = <&mailbox 0>;
+	#power-domain-cells = <1>;

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