Add binding for TZ1090 divider clock. This supports a subset of the
functionality of the generic divider, and by being specific to the
TZ1090 SoC it allows policy decisions to be made from the driver.
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
---
.../bindings/clock/img,tz1090-divider.txt | 37 ++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644
Documentation/devicetree/bindings/clock/img,tz1090-divider.txt
diff --git a/Documentation/devicetree/bindings/clock/img,tz1090-divider.txt
b/Documentation/devicetree/bindings/clock/img,tz1090-divider.txt
new file mode 100644
index 0000000..25f9b9a
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/img,tz1090-divider.txt
@@ -0,0 +1,37 @@
+Binding for TZ1090 simple divider clock.
+
+This binding uses the common clock binding[1]. It assumes a register-mapped
+adjustable clock rate divider that does not gate and has only one input clock
or
+parent. The value programmed into the register is one less than the actual
+divisor value. E.g:
+
+register value actual divisor value
+0 1
+1 2
+2 3
+
+The binding must also provide the register to control the divider and the mask
+for the corresponding control bits. The shift is calculated from the mask as
+(ffs(mask) - 1)
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : shall be "divider-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : link to phandle of parent clock
+- reg : base address for register controlling adjustable divider
+- bit-mask : arbitrary bitmask for programming the adjustable divider
+
+Optional properties:
+- clock-output-names : from common clock binding.
+
+Examples:
+ sys_clk_div: sys_clk_div {
+ compatible = "img,tz1090-divider";
+ #clock-cells = <0>;
+ clocks = <&sys_pll>;
+ reg = <0x02005914 0x4>; /* CR_TOP_SYSCLK_DIV */
+ bit-mask = <0xff>; /* CR_TOP_SYSDIV */
+ clock-output-names = "sys_div";
+ };
--
2.0.4
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