clk: samsung: Add dt bindings for Exynos4412 ISP clock controller

Some registers for the Exynos 4412 ISP (Camera subsystem) clocks are
located in the ISP power domain. Because those registers are also
located in a different memory region than the main clock controller,
support for them can be provided by a separate clock controller.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Documentation/devicetree/bindings/clock/exynos4-clock.txt

@@ -41,3 +41,46 @@ Example 2: UART controller node that consumes the clock generated by the clock
 		clocks = <&clock CLK_UART2>, <&clock CLK_SCLK_UART2>;
 		clock-names = "uart", "clk_uart_baud0";
 	};
+
+Exynos4412 SoC contains some additional clocks for FIMC-ISP (Camera ISP)
+subsystem. Registers for those clocks are located in the ISP power domain.
+Because those registers are also located in a different memory region than
+the main clock controller, a separate clock controller has to be defined for
+handling them.
+
+Required Properties:
+
+- compatible: should be "samsung,exynos4412-isp-clock".
+
+- reg: physical base address of the ISP clock controller and length of memory
+  mapped region.
+
+- #clock-cells: should be 1.
+
+- clocks: list of the clock controller input clock identifiers,
+  from common clock bindings, should point to CLK_ACLK200 and
+  CLK_ACLK400_MCUISP clocks from the main clock controller.
+
+- clock-names: list of the clock controller input clock names,
+  as described in clock-bindings.txt, should be "aclk200" and
+  "aclk400_mcuisp".
+
+- power-domains: a phandle to ISP power domain node as described by
+  generic PM domain bindings.
+
+Example 3: The clock controllers bindings for Exynos4412 SoCs.
+
+	clock: clock-controller@10030000 {
+		compatible = "samsung,exynos4412-clock";
+		reg = <0x10030000 0x18000>;
+		#clock-cells = <1>;
+	};
+
+	isp_clock: clock-controller@10048000 {
+		compatible = "samsung,exynos4412-isp-clock";
+		reg = <0x10048000 0x1000>;
+		#clock-cells = <1>;
+		power-domains = <&pd_isp>;
+		clocks = <&clock CLK_ACLK200>, <&clock CLK_ACLK400_MCUISP>;
+		clock-names = "aclk200", "aclk400_mcuisp";
+	};

include/dt-bindings/clock/exynos4.h

@@ -272,4 +272,39 @@
 /* must be greater than maximal clock id */
 #define CLK_NR_CLKS		461
 
+/* Exynos4x12 ISP clocks */
+#define CLK_ISP_FIMC_ISP		 1
+#define CLK_ISP_FIMC_DRC		 2
+#define CLK_ISP_FIMC_FD			 3
+#define CLK_ISP_FIMC_LITE0		 4
+#define CLK_ISP_FIMC_LITE1		 5
+#define CLK_ISP_MCUISP			 6
+#define CLK_ISP_GICISP			 7
+#define CLK_ISP_SMMU_ISP		 8
+#define CLK_ISP_SMMU_DRC		 9
+#define CLK_ISP_SMMU_FD			10
+#define CLK_ISP_SMMU_LITE0		11
+#define CLK_ISP_SMMU_LITE1		12
+#define CLK_ISP_PPMUISPMX		13
+#define CLK_ISP_PPMUISPX		14
+#define CLK_ISP_MCUCTL_ISP		15
+#define CLK_ISP_MPWM_ISP		16
+#define CLK_ISP_I2C0_ISP		17
+#define CLK_ISP_I2C1_ISP		18
+#define CLK_ISP_MTCADC_ISP		19
+#define CLK_ISP_PWM_ISP			20
+#define CLK_ISP_WDT_ISP			21
+#define CLK_ISP_UART_ISP		22
+#define CLK_ISP_ASYNCAXIM		23
+#define CLK_ISP_SMMU_ISPCX		24
+#define CLK_ISP_SPI0_ISP		25
+#define CLK_ISP_SPI1_ISP		26
+
+#define CLK_ISP_DIV_ISP0		27
+#define CLK_ISP_DIV_ISP1		28
+#define CLK_ISP_DIV_MCUISP0		29
+#define CLK_ISP_DIV_MCUISP1		30
+
+#define CLK_NR_ISP_CLKS			31
+
 #endif /* _DT_BINDINGS_CLOCK_EXYNOS_4_H */