ARM: i.MX21 clk: Add devicetree support

This patch adds devicetree support CCM module for i.MX21 CPUs.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

Documentation/devicetree/bindings/clock/imx21-clock.txt

+* Clock bindings for Freescale i.MX21
+
+Required properties:
+- compatible  : Should be "fsl,imx21-ccm".
+- reg         : Address and length of the register set.
+- interrupts  : Should contain CCM interrupt.
+- #clock-cells: Should be <1>.
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx21-clock.h
+for the full list of i.MX21 clock IDs.
+
+Examples:
+	clks: ccm@10027000{
+		compatible = "fsl,imx21-ccm";
+		reg = <0x10027000 0x800>;
+		#clock-cells = <1>;
+	};
+
+	uart1: serial@1000a000 {
+		compatible = "fsl,imx21-uart";
+		reg = <0x1000a000 0x1000>;
+		interrupts = <20>;
+		clocks = <&clks IMX21_CLK_UART1_IPG_GATE>,
+			 <&clks IMX21_CLK_PER1>;
+		clock-names = "ipg", "per";
+		status = "disabled";
+	};

include/dt-bindings/clock/imx21-clock.h

+/*
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_IMX21_H
+#define __DT_BINDINGS_CLOCK_IMX21_H
+
+#define IMX21_CLK_DUMMY			0
+#define IMX21_CLK_CKIL			1
+#define IMX21_CLK_CKIH			2
+#define IMX21_CLK_FPM			3
+#define IMX21_CLK_CKIH_DIV1P5		4
+#define IMX21_CLK_MPLL_GATE		5
+#define IMX21_CLK_SPLL_GATE		6
+#define IMX21_CLK_FPM_GATE		7
+#define IMX21_CLK_CKIH_GATE		8
+#define IMX21_CLK_MPLL_OSC_SEL		9
+#define IMX21_CLK_IPG			10
+#define IMX21_CLK_HCLK			11
+#define IMX21_CLK_MPLL_SEL		12
+#define IMX21_CLK_SPLL_SEL		13
+#define IMX21_CLK_SSI1_SEL		14
+#define IMX21_CLK_SSI2_SEL		15
+#define IMX21_CLK_USB_DIV		16
+#define IMX21_CLK_FCLK			17
+#define IMX21_CLK_MPLL			18
+#define IMX21_CLK_SPLL			19
+#define IMX21_CLK_NFC_DIV		20
+#define IMX21_CLK_SSI1_DIV		21
+#define IMX21_CLK_SSI2_DIV		22
+#define IMX21_CLK_PER1			23
+#define IMX21_CLK_PER2			24
+#define IMX21_CLK_PER3			25
+#define IMX21_CLK_PER4			26
+#define IMX21_CLK_UART1_IPG_GATE	27
+#define IMX21_CLK_UART2_IPG_GATE	28
+#define IMX21_CLK_UART3_IPG_GATE	29
+#define IMX21_CLK_UART4_IPG_GATE	30
+#define IMX21_CLK_CSPI1_IPG_GATE	31
+#define IMX21_CLK_CSPI2_IPG_GATE	32
+#define IMX21_CLK_SSI1_GATE		33
+#define IMX21_CLK_SSI2_GATE		34
+#define IMX21_CLK_SDHC1_IPG_GATE	35
+#define IMX21_CLK_SDHC2_IPG_GATE	36
+#define IMX21_CLK_GPIO_GATE		37
+#define IMX21_CLK_I2C_GATE		38
+#define IMX21_CLK_DMA_GATE		39
+#define IMX21_CLK_USB_GATE		40
+#define IMX21_CLK_EMMA_GATE		41
+#define IMX21_CLK_SSI2_BAUD_GATE	42
+#define IMX21_CLK_SSI1_BAUD_GATE	43
+#define IMX21_CLK_LCDC_IPG_GATE		44
+#define IMX21_CLK_NFC_GATE		45
+#define IMX21_CLK_LCDC_HCLK_GATE	46
+#define IMX21_CLK_PER4_GATE		47
+#define IMX21_CLK_BMI_GATE		48
+#define IMX21_CLK_USB_HCLK_GATE		49
+#define IMX21_CLK_SLCDC_GATE		50
+#define IMX21_CLK_SLCDC_HCLK_GATE	51
+#define IMX21_CLK_EMMA_HCLK_GATE	52
+#define IMX21_CLK_BROM_GATE		53
+#define IMX21_CLK_DMA_HCLK_GATE		54
+#define IMX21_CLK_CSI_HCLK_GATE		55
+#define IMX21_CLK_CSPI3_IPG_GATE	56
+#define IMX21_CLK_WDOG_GATE		57
+#define IMX21_CLK_GPT1_IPG_GATE		58
+#define IMX21_CLK_GPT2_IPG_GATE		59
+#define IMX21_CLK_GPT3_IPG_GATE		60
+#define IMX21_CLK_PWM_IPG_GATE		61
+#define IMX21_CLK_RTC_GATE		62
+#define IMX21_CLK_KPP_GATE		63
+#define IMX21_CLK_OWIRE_GATE		64
+#define IMX21_CLK_MAX			65
+
+#endif