Add device tree support for AXD Audio Processing IP
Signed-off-by: Qais Yousef <qais.you...@imgtec.com>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Rob Herring <robh...@kernel.org>
Cc: Pawel Moll <pawel.m...@arm.com>
Cc: Mark Rutland <mark.rutl...@arm.com>
Cc: Ian Campbell <ijc+devicet...@hellion.org.uk>
Cc: Kumar Gala <ga...@codeaurora.org>
Cc: <devicet...@vger.kernel.org>
Cc: <alsa-de...@alsa-project.org>
---
Documentation/devicetree/bindings/axd.txt | 39 +++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 Documentation/devicetree/bindings/axd.txt
diff --git a/Documentation/devicetree/bindings/axd.txt
b/Documentation/devicetree/bindings/axd.txt
new file mode 100644
index 000000000000..694fc40613fb
--- /dev/null
+++ b/Documentation/devicetree/bindings/axd.txt
@@ -0,0 +1,39 @@
+* AXD Audio Processing IP Binding *
+
+Required properties:
+- compatible: "img,axd"
+- clocks: phandle for the clock that drives AXD.
+- interrupts: the GIC interrupt where AXD is connected or software interrupt
+ 1 (not recommended).
+
+Optional properties:
+- gic-irq: it takes two non-zero values, the first one is the host hwirq and
+ the second one is axd's. Host's hwirq should match the value in
+ interrupts.
+ If not using GIC, then axd will revert to using software interrupt 1
+ which is a fallback mechanism for systems without GIC. It is
+ recommended to use GIC whenever possible. Some systems will only
work
+ with GIC so this property will not be optional then.
+- vpe: VPE number on which axd should start. Must be provided if axd is
+ running as a single VPE along Linux on the same core.
+ It can't be VPE0.
+ The VPE must be offlined by Linux before axd is loaded.
+- inbuf-size: size of shared input buffers area. by default it's 0x7800 bytes.
+- outbuf-size: size of shared output buffers area. by default it's 0x3c000
bytes.
+
+
+Example:
+
+ axdclk: axdclk@400M {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <400000000>;
+ };
+
+ axd: axd@07800000 {
+ compatible = "img,axd";
+ clocks = <&axdclk>;
+ interrupts = <36 IRQ_TYPE_EDGE_RISING>
+ gic-irq = <36 37>;
+ vpe = <1>;
+ };
--
2.1.0
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