[PATCHv3 6/7] dt-bindings: add documentation for Exynos3250 clock controller

Chanwoo Choi cw00.choi at samsung.com
Thu Apr 17 18:15:27 PDT 2014


The Exynos3250 clocks are statically listed and registered using the
Samsung specific common clock helper functions. Both device tree based
clock lookup and clkdev based clock lookups are supported.

Cc: Mike Turquette <mturquette at linaro.org>
Cc: Kukjin Kim <kgene.kim at samsung.com>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Pawel Moll <pawel.moll at arm.com>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Ian Campbell <ijc+devicetree at hellion.org.uk>
Cc: Kumar Gala <galak at codeaurora.org>
Cc: Randy Dunlap <rdunlap at infradead.org>
Cc: Tomasz Figa <t.figa at samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi at samsung.com>
Signed-off-by: Tomasz Figa <t.figa at samsung.com>
Acked-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 .../devicetree/bindings/clock/exynos3250-clock.txt | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/exynos3250-clock.txt

diff --git a/Documentation/devicetree/bindings/clock/exynos3250-clock.txt b/Documentation/devicetree/bindings/clock/exynos3250-clock.txt
new file mode 100644
index 0000000..aadc9c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/exynos3250-clock.txt
@@ -0,0 +1,41 @@
+* Samsung Exynos3250 Clock Controller
+
+The Exynos3250 clock controller generates and supplies clock to various
+controllers within the Exynos3250 SoC.
+
+Required Properties:
+
+- compatible: should be one of the following.
+  - "samsung,exynos3250-cmu" - controller compatible with Exynos3250 SoC.
+
+- reg: physical base address of the controller and length of memory mapped
+  region.
+
+- #clock-cells: should be 1.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume.
+
+All available clocks are defined as preprocessor macros in
+dt-bindings/clock/exynos3250.h header and can be used in device
+tree sources.
+
+Example 1: An example of a clock controller node is listed below.
+
+	cmu: clock-controller at 10030000 {
+		compatible = "samsung,exynos3250-cmu";
+		reg = <0x10030000 0x20000>;
+		#clock-cells = <1>;
+	};
+
+Example 2: UART controller node that consumes the clock generated by the clock
+	   controller. Refer to the standard clock bindings for information
+	   about 'clocks' and 'clock-names' property.
+
+	serial at 13800000 {
+		compatible = "samsung,exynos4210-uart";
+		reg = <0x13800000 0x100>;
+		interrupts = <0 109 0>;
+		clocks = <&cmu CLK_UART0>, <&cmu CLK_SCLK_UART0>;
+		clock-names = "uart", "clk_uart_baud0";
+	};
-- 
1.8.0




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