[PATCH 02/19] clk: samsung: Add binding documentation for Exynos5433 clock controller

[Chanwoo Choi]

This patch add binding documentation for Exynos5433 clock controller.
Exynos5433 has various clock domains So, this documentation explains
the detailed clock domains ans usage guide.

Cc: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Cc: Tomasz Figa <tomasz.figa@xxxxxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Acked-by: Inki Dae <inki.dae@xxxxxxxxxxx>
Acked-by: Geunsik Lim <geunsik.lim@xxxxxxxxxxx>
---
 .../devicetree/bindings/clock/exynos5433-clock.txt | 106 +++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/exynos5433-clock.txt

diff --git a/Documentation/devicetree/bindings/clock/exynos5433-clock.txt b/Documentation/devicetree/bindings/clock/exynos5433-clock.txt
new file mode 100644
index 0000000..72cd0ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/exynos5433-clock.txt
@@ -0,0 +1,106 @@
+* Samsung Exynos5433 CMU (Clock Management Units)
+
+The Exynos5433 clock controller generates and supplies clock to various
+controllers within the Exynos5433 SoC.
+
+Required Properties:
+
+- compatible: should be one of the following.
+  - "samsung,exynos5433-cmu-top"   - clock controller compatible for CMU_TOP
+    which generates clocks for IMEM/FSYS/G3D/GSCL/HEVC/MSCL/G2D/MFC/PERIC/PERIS
+    domains and bus clocks.
+  - "samsung,exynos5433-cmu-cpif"  - clock controller compatible for CMU_CPIF
+    which generates clocks for LLI (Low Latency Interface) IP.
+  - "samsung,exynos5433-cmu-mif"   - clock controller compatible for CMU_MIF
+    which generates clocks for DRAM Memory Controller domain.
+  - "samsung,exynos5433-cmu-peric" - clock controller compatible for CMU_PERIC
+    which generates clocks for UART/I2C/SPI/I2S/PCM/SPDIF/PWM/SLIMBUS IPs.
+  - "samsung,exynos5433-cmu-peris" - clock controller compatible for CMU_PERIS
+    which generates clocks for PMU/TMU/MCT/WDT/RTC/SECKEY/TZPC IPs.
+  - "samsung,exynos5433-cmu-fsys"  - clock controller compatible for CMU_FSYS
+    which generates clocks for USB/UFS/SDMMC/TSI/PDMA IPs.
+
+- 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/exynos5433.h header and can be used in device
+tree sources.
+
+Example 1: Examples of clock controller nodes are listed below.
+
+	cmu_top: clock-controller@0x10030000 {
+		compatible = "samsung,exynos5433-cmu-top";
+		reg = <0x10030000 0x0c04>;
+		#clock-cells = <1>;
+	};
+
+	cmu_cpif: clock-controller@0x10fc0000 {
+		compatible = "samsung,exynos5433-cmu-cpif";
+		reg = <0x10fc0000 0x0c04>;
+		#clock-cells = <1>;
+	};
+
+	cmu_mif: clock-controller@0x105b0000 {
+		compatible = "samsung,exynos5433-cmu-mif";
+		reg = <0x105b0000 0x100c>;
+		#clock-cells = <1>;
+	};
+
+	cmu_peric: clock-controller@0x14c80000 {
+		compatible = "samsung,exynos5433-cmu-peric";
+		reg = <0x14c80000 0x0b08>;
+		#clock-cells = <1>;
+	};
+
+	cmu_peris: clock-controller@0x10040000 {
+		compatible = "samsung,exynos5433-cmu-peris";
+		reg = <0x10040000 0x0b20>;
+		#clock-cells = <1>;
+	};
+
+	cmu_fsys: clock-controller@0x156e0000 {
+		compatible = "samsung,exynos5433-cmu-fsys";
+		reg = <0x156e0000 0x0b04>;
+		#clock-cells = <1>;
+	};
+
+Example 2: UART controller node that consumes the clock generated by the clock
+	   controller.
+
+	serial_0: serial@14C10000 {
+		compatible = "samsung,exynos5433-uart";
+		reg = <0x14C10000 0x100>;
+		interrupts = <0 421 0>;
+		clocks = <&cmu_peric CLK_PCLK_UART0>,
+			 <&cmu_peric CLK_SCLK_UART0>;
+		clock-names = "uart", "clk_uart_baud0";
+		pinctrl-names = "default";
+		pinctrl-0 = <&uart0_bus>;
+		status = "disabled";
+	};
+
+Example 3: SPI controller node that consumes the clock generated by the clock
+	   controller.
+
+	spi_0: spi@14d20000 {
+		compatible = "samsung,exynos7-spi";
+		reg = <0x14d20000 0x100>;
+		interrupts = <0 432 0>;
+		dmas = <&pdma0 9>, <&pdma0 8>;
+		dma-names = "tx", "rx";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clocks = <&cmu_peric CLK_PCLK_SPI0>,
+			 <&cmu_top CLK_SCLK_SPI0_PERIC>;
+		clock-names = "spi", "spi_busclk0";
+		samsung,spi-src-clk = <0>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&spi0_bus>;
+		status = "disabled";
+	};
-- 
1.8.5.5

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