Add simple device tree binding for TZ1090 PLL clock. It takes a couple
of registers, and has a single reference clock source.
Signed-off-by: James Hogan <james.ho...@imgtec.com>
Cc: Mike Turquette <mturque...@linaro.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: linux-me...@vger.kernel.org
Cc: devicet...@vger.kernel.org
---
.../devicetree/bindings/clock/img,tz1090-pll.txt | 33 ++++++++++++++++++++++
1 file changed, 33 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/img,tz1090-pll.txt
diff --git a/Documentation/devicetree/bindings/clock/img,tz1090-pll.txt
b/Documentation/devicetree/bindings/clock/img,tz1090-pll.txt
new file mode 100644
index 0000000..20aa622
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/img,tz1090-pll.txt
@@ -0,0 +1,33 @@
+Binding for TZ1090 Phase-Lock Loop (PLL) clocks.
+
+This binding uses the common clock binding[1]. These PLLs are configured with 2
+registers specified with the reg property. These contain various fields which
+among other things specify the reference divider value (r), the frequency
+divider value (f), and the output divider value (od). When enabled, the output
+clock rate is:
+
+ f_out = f_ref / r * (f / 2) / od
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : Shall be "img,tz1090-pll".
+- #clock-cells : From common clock binding; shall be set to 0.
+- reg : Address of configuration register pair.
+- clocks : From common clock binding.
+
+Required source clocks:
+- 0 : Reference clock used to generate the output clock
+ (doesn't have to be named).
+
+Optional properties:
+- clock-output-names : From common clock binding.
+
+Example:
+ sys_pll {
+ compatible = "img,tz1090-pll";
+ #clock-cells = <0>;
+ clocks = <&sysclk0_sw>;
+ reg = <0x02005950 0x8>; /* CR_TOP_SYSPLL_CTL{0,1} */
+ clock-output-names = "sys_pll";
+ };
--
2.0.4
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