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>

3 files changed, 244 insertions, 123 deletions

diff --git a/Documentation/devicetree/bindings/clock/imx21-clock.txt b/Documentation/devicetree/bindings/clock/imx21-clock.txt
new file mode 100644
index 000000000000..c3b0db437c48
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/imx21-clock.txt
@@ -0,0 +1,28 @@
+* 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";
+	};
diff --git a/arch/arm/mach-imx/clk-imx21.c b/arch/arm/mach-imx/clk-imx21.c
index 990713597de7..6b36738b170d 100644
--- a/arch/arm/mach-imx/clk-imx21.c
+++ b/arch/arm/mach-imx/clk-imx21.c
@@ -12,149 +12,162 @@
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <dt-bindings/clock/imx21-clock.h>
 
 #include "clk.h"
 #include "common.h"
 #include "hardware.h"
 
-#define IO_ADDR_CCM(off)	(MX21_IO_ADDRESS(MX21_CCM_BASE_ADDR + (off)))
+static void __iomem *ccm __initdata;
 
 /* Register offsets */
-#define CCM_CSCR		IO_ADDR_CCM(0x0)
-#define CCM_MPCTL0		IO_ADDR_CCM(0x4)
-#define CCM_SPCTL0		IO_ADDR_CCM(0xc)
-#define CCM_PCDR0		IO_ADDR_CCM(0x18)
-#define CCM_PCDR1		IO_ADDR_CCM(0x1c)
-#define CCM_PCCR0		IO_ADDR_CCM(0x20)
-#define CCM_PCCR1		IO_ADDR_CCM(0x24)
+#define CCM_CSCR	(ccm + 0x00)
+#define CCM_MPCTL0	(ccm + 0x04)
+#define CCM_SPCTL0	(ccm + 0x0c)
+#define CCM_PCDR0	(ccm + 0x18)
+#define CCM_PCDR1	(ccm + 0x1c)
+#define CCM_PCCR0	(ccm + 0x20)
+#define CCM_PCCR1	(ccm + 0x24)
 
 static const char *mpll_osc_sel_clks[] = { "ckih_gate", "ckih_div1p5", };
 static const char *mpll_sel_clks[] = { "fpm_gate", "mpll_osc_sel", };
 static const char *spll_sel_clks[] = { "fpm_gate", "mpll_osc_sel", };
 static const char *ssi_sel_clks[] = { "spll_gate", "mpll_gate", };
 
-enum imx21_clks {
-	dummy, ckil, ckih, fpm, ckih_div1p5, mpll_gate, spll_gate, fpm_gate,
-	ckih_gate, mpll_osc_sel, ipg, hclk, mpll_sel, spll_sel, ssi1_sel,
-	ssi2_sel, usb_div, fclk, mpll, spll, nfc_div, ssi1_div, ssi2_div, per1,
-	per2, per3, per4, uart1_ipg_gate, uart2_ipg_gate, uart3_ipg_gate,
-	uart4_ipg_gate, cspi1_ipg_gate, cspi2_ipg_gate, ssi1_gate, ssi2_gate,
-	sdhc1_ipg_gate, sdhc2_ipg_gate, gpio_gate, i2c_gate, dma_gate, usb_gate,
-	emma_gate, ssi2_baud_gate, ssi1_baud_gate, lcdc_ipg_gate, nfc_gate,
-	lcdc_hclk_gate, per4_gate, bmi_gate, usb_hclk_gate, slcdc_gate,
-	slcdc_hclk_gate, emma_hclk_gate, brom_gate, dma_hclk_gate,
-	csi_hclk_gate, cspi3_ipg_gate, wdog_gate, gpt1_ipg_gate, gpt2_ipg_gate,
-	gpt3_ipg_gate, pwm_ipg_gate, rtc_gate, kpp_gate, owire_gate, clk_max
-};
-
-static struct clk *clk[clk_max];
+static struct clk *clk[IMX21_CLK_MAX];
+static struct clk_onecell_data clk_data;
 
-int __init mx21_clocks_init(unsigned long lref, unsigned long href)
+static void __init _mx21_clocks_init(unsigned long lref, unsigned long href)
 {
-	clk[dummy] = imx_clk_fixed("dummy", 0);
-	clk[ckil] = imx_clk_fixed("ckil", lref);
-	clk[ckih] = imx_clk_fixed("ckih", href);
-	clk[fpm] = imx_clk_fixed_factor("fpm", "ckil", 512, 1);
-	clk[ckih_div1p5] = imx_clk_fixed_factor("ckih_div1p5", "ckih_gate", 2, 3);
-
-	clk[mpll_gate] = imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
-	clk[spll_gate] = imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
-	clk[fpm_gate] = imx_clk_gate("fpm_gate", "fpm", CCM_CSCR, 2);
-	clk[ckih_gate] = imx_clk_gate_dis("ckih_gate", "ckih", CCM_CSCR, 3);
-	clk[mpll_osc_sel] = imx_clk_mux("mpll_osc_sel", CCM_CSCR, 4, 1, mpll_osc_sel_clks, ARRAY_SIZE(mpll_osc_sel_clks));
-	clk[ipg] = imx_clk_divider("ipg", "hclk", CCM_CSCR, 9, 1);
-	clk[hclk] = imx_clk_divider("hclk", "fclk", CCM_CSCR, 10, 4);
-	clk[mpll_sel] = imx_clk_mux("mpll_sel", CCM_CSCR, 16, 1, mpll_sel_clks, ARRAY_SIZE(mpll_sel_clks));
-	clk[spll_sel] = imx_clk_mux("spll_sel", CCM_CSCR, 17, 1, spll_sel_clks, ARRAY_SIZE(spll_sel_clks));
-	clk[ssi1_sel] = imx_clk_mux("ssi1_sel", CCM_CSCR, 19, 1, ssi_sel_clks, ARRAY_SIZE(ssi_sel_clks));
-	clk[ssi2_sel] = imx_clk_mux("ssi2_sel", CCM_CSCR, 20, 1, ssi_sel_clks, ARRAY_SIZE(ssi_sel_clks));
-	clk[usb_div] = imx_clk_divider("usb_div", "spll_gate", CCM_CSCR, 26, 3);
-	clk[fclk] = imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 29, 3);
-
-	clk[mpll] = imx_clk_pllv1("mpll", "mpll_sel", CCM_MPCTL0);
-
-	clk[spll] = imx_clk_pllv1("spll", "spll_sel", CCM_SPCTL0);
-
-	clk[nfc_div] = imx_clk_divider("nfc_div", "fclk", CCM_PCDR0, 12, 4);
-	clk[ssi1_div] = imx_clk_divider("ssi1_div", "ssi1_sel", CCM_PCDR0, 16, 6);
-	clk[ssi2_div] = imx_clk_divider("ssi2_div", "ssi2_sel", CCM_PCDR0, 26, 6);
-
-	clk[per1] = imx_clk_divider("per1", "mpll_gate", CCM_PCDR1, 0, 6);
-	clk[per2] = imx_clk_divider("per2", "mpll_gate", CCM_PCDR1, 8, 6);
-	clk[per3] = imx_clk_divider("per3", "mpll_gate", CCM_PCDR1, 16, 6);
-	clk[per4] = imx_clk_divider("per4", "mpll_gate", CCM_PCDR1, 24, 6);
-
-	clk[uart1_ipg_gate] = imx_clk_gate("uart1_ipg_gate", "ipg", CCM_PCCR0, 0);
-	clk[uart2_ipg_gate] = imx_clk_gate("uart2_ipg_gate", "ipg", CCM_PCCR0, 1);
-	clk[uart3_ipg_gate] = imx_clk_gate("uart3_ipg_gate", "ipg", CCM_PCCR0, 2);
-	clk[uart4_ipg_gate] = imx_clk_gate("uart4_ipg_gate", "ipg", CCM_PCCR0, 3);
-	clk[cspi1_ipg_gate] = imx_clk_gate("cspi1_ipg_gate", "ipg", CCM_PCCR0, 4);
-	clk[cspi2_ipg_gate] = imx_clk_gate("cspi2_ipg_gate", "ipg", CCM_PCCR0, 5);
-	clk[ssi1_gate] = imx_clk_gate("ssi1_gate", "ipg", CCM_PCCR0, 6);
-	clk[ssi2_gate] = imx_clk_gate("ssi2_gate", "ipg", CCM_PCCR0, 7);
-	clk[sdhc1_ipg_gate] = imx_clk_gate("sdhc1_ipg_gate", "ipg", CCM_PCCR0, 9);
-	clk[sdhc2_ipg_gate] = imx_clk_gate("sdhc2_ipg_gate", "ipg", CCM_PCCR0, 10);
-	clk[gpio_gate] = imx_clk_gate("gpio_gate", "ipg", CCM_PCCR0, 11);
-	clk[i2c_gate] = imx_clk_gate("i2c_gate", "ipg", CCM_PCCR0, 12);
-	clk[dma_gate] = imx_clk_gate("dma_gate", "ipg", CCM_PCCR0, 13);
-	clk[usb_gate] = imx_clk_gate("usb_gate", "usb_div", CCM_PCCR0, 14);
-	clk[emma_gate] = imx_clk_gate("emma_gate", "ipg", CCM_PCCR0, 15);
-	clk[ssi2_baud_gate] = imx_clk_gate("ssi2_baud_gate", "ipg", CCM_PCCR0, 16);
-	clk[ssi1_baud_gate] = imx_clk_gate("ssi1_baud_gate", "ipg", CCM_PCCR0, 17);
-	clk[lcdc_ipg_gate] = imx_clk_gate("lcdc_ipg_gate", "ipg", CCM_PCCR0, 18);
-	clk[nfc_gate] = imx_clk_gate("nfc_gate", "nfc_div", CCM_PCCR0, 19);
-	clk[slcdc_hclk_gate] = imx_clk_gate("slcdc_hclk_gate", "hclk", CCM_PCCR0, 21);
-	clk[per4_gate] = imx_clk_gate("per4_gate", "per4", CCM_PCCR0, 22);
-	clk[bmi_gate] = imx_clk_gate("bmi_gate", "hclk", CCM_PCCR0, 23);
-	clk[usb_hclk_gate] = imx_clk_gate("usb_hclk_gate", "hclk", CCM_PCCR0, 24);
-	clk[slcdc_gate] = imx_clk_gate("slcdc_gate", "hclk", CCM_PCCR0, 25);
-	clk[lcdc_hclk_gate] = imx_clk_gate("lcdc_hclk_gate", "hclk", CCM_PCCR0, 26);
-	clk[emma_hclk_gate] = imx_clk_gate("emma_hclk_gate", "hclk", CCM_PCCR0, 27);
-	clk[brom_gate] = imx_clk_gate("brom_gate", "hclk", CCM_PCCR0, 28);
-	clk[dma_hclk_gate] = imx_clk_gate("dma_hclk_gate", "hclk", CCM_PCCR0, 30);
-	clk[csi_hclk_gate] = imx_clk_gate("csi_hclk_gate", "hclk", CCM_PCCR0, 31);
-
-	clk[cspi3_ipg_gate] = imx_clk_gate("cspi3_ipg_gate", "ipg", CCM_PCCR1, 23);
-	clk[wdog_gate] = imx_clk_gate("wdog_gate", "ipg", CCM_PCCR1, 24);
-	clk[gpt1_ipg_gate] = imx_clk_gate("gpt1_ipg_gate", "ipg", CCM_PCCR1, 25);
-	clk[gpt2_ipg_gate] = imx_clk_gate("gpt2_ipg_gate", "ipg", CCM_PCCR1, 26);
-	clk[gpt3_ipg_gate] = imx_clk_gate("gpt3_ipg_gate", "ipg", CCM_PCCR1, 27);
-	clk[pwm_ipg_gate] = imx_clk_gate("pwm_ipg_gate", "ipg", CCM_PCCR1, 28);
-	clk[rtc_gate] = imx_clk_gate("rtc_gate", "ipg", CCM_PCCR1, 29);
-	clk[kpp_gate] = imx_clk_gate("kpp_gate", "ipg", CCM_PCCR1, 30);
-	clk[owire_gate] = imx_clk_gate("owire_gate", "ipg", CCM_PCCR1, 31);
+	BUG_ON(!ccm);
+
+	clk[IMX21_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
+	clk[IMX21_CLK_CKIL] = imx_obtain_fixed_clock("ckil", lref);
+	clk[IMX21_CLK_CKIH] = imx_obtain_fixed_clock("ckih", href);
+	clk[IMX21_CLK_FPM] = imx_clk_fixed_factor("fpm", "ckil", 512, 1);
+	clk[IMX21_CLK_CKIH_DIV1P5] = imx_clk_fixed_factor("ckih_div1p5", "ckih_gate", 2, 3);
+
+	clk[IMX21_CLK_MPLL_GATE] = imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
+	clk[IMX21_CLK_SPLL_GATE] = imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
+	clk[IMX21_CLK_FPM_GATE] = imx_clk_gate("fpm_gate", "fpm", CCM_CSCR, 2);
+	clk[IMX21_CLK_CKIH_GATE] = imx_clk_gate_dis("ckih_gate", "ckih", CCM_CSCR, 3);
+	clk[IMX21_CLK_MPLL_OSC_SEL] = imx_clk_mux("mpll_osc_sel", CCM_CSCR, 4, 1, mpll_osc_sel_clks, ARRAY_SIZE(mpll_osc_sel_clks));
+	clk[IMX21_CLK_IPG] = imx_clk_divider("ipg", "hclk", CCM_CSCR, 9, 1);
+	clk[IMX21_CLK_HCLK] = imx_clk_divider("hclk", "fclk", CCM_CSCR, 10, 4);
+	clk[IMX21_CLK_MPLL_SEL] = imx_clk_mux("mpll_sel", CCM_CSCR, 16, 1, mpll_sel_clks, ARRAY_SIZE(mpll_sel_clks));
+	clk[IMX21_CLK_SPLL_SEL] = imx_clk_mux("spll_sel", CCM_CSCR, 17, 1, spll_sel_clks, ARRAY_SIZE(spll_sel_clks));
+	clk[IMX21_CLK_SSI1_SEL] = imx_clk_mux("ssi1_sel", CCM_CSCR, 19, 1, ssi_sel_clks, ARRAY_SIZE(ssi_sel_clks));
+	clk[IMX21_CLK_SSI2_SEL] = imx_clk_mux("ssi2_sel", CCM_CSCR, 20, 1, ssi_sel_clks, ARRAY_SIZE(ssi_sel_clks));
+	clk[IMX21_CLK_USB_DIV] = imx_clk_divider("usb_div", "spll_gate", CCM_CSCR, 26, 3);
+	clk[IMX21_CLK_FCLK] = imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 29, 3);
+
+	clk[IMX21_CLK_MPLL] = imx_clk_pllv1("mpll", "mpll_sel", CCM_MPCTL0);
+
+	clk[IMX21_CLK_SPLL] = imx_clk_pllv1("spll", "spll_sel", CCM_SPCTL0);
+
+	clk[IMX21_CLK_NFC_DIV] = imx_clk_divider("nfc_div", "fclk", CCM_PCDR0, 12, 4);
+	clk[IMX21_CLK_SSI1_DIV] = imx_clk_divider("ssi1_div", "ssi1_sel", CCM_PCDR0, 16, 6);
+	clk[IMX21_CLK_SSI2_DIV] = imx_clk_divider("ssi2_div", "ssi2_sel", CCM_PCDR0, 26, 6);
+
+	clk[IMX21_CLK_PER1] = imx_clk_divider("per1", "mpll_gate", CCM_PCDR1, 0, 6);
+	clk[IMX21_CLK_PER2] = imx_clk_divider("per2", "mpll_gate", CCM_PCDR1, 8, 6);
+	clk[IMX21_CLK_PER3] = imx_clk_divider("per3", "mpll_gate", CCM_PCDR1, 16, 6);
+	clk[IMX21_CLK_PER4] = imx_clk_divider("per4", "mpll_gate", CCM_PCDR1, 24, 6);
+
+	clk[IMX21_CLK_UART1_IPG_GATE] = imx_clk_gate("uart1_ipg_gate", "ipg", CCM_PCCR0, 0);
+	clk[IMX21_CLK_UART2_IPG_GATE] = imx_clk_gate("uart2_ipg_gate", "ipg", CCM_PCCR0, 1);
+	clk[IMX21_CLK_UART3_IPG_GATE] = imx_clk_gate("uart3_ipg_gate", "ipg", CCM_PCCR0, 2);
+	clk[IMX21_CLK_UART4_IPG_GATE] = imx_clk_gate("uart4_ipg_gate", "ipg", CCM_PCCR0, 3);
+	clk[IMX21_CLK_CSPI1_IPG_GATE] = imx_clk_gate("cspi1_ipg_gate", "ipg", CCM_PCCR0, 4);
+	clk[IMX21_CLK_CSPI2_IPG_GATE] = imx_clk_gate("cspi2_ipg_gate", "ipg", CCM_PCCR0, 5);
+	clk[IMX21_CLK_SSI1_GATE] = imx_clk_gate("ssi1_gate", "ipg", CCM_PCCR0, 6);
+	clk[IMX21_CLK_SSI2_GATE] = imx_clk_gate("ssi2_gate", "ipg", CCM_PCCR0, 7);
+	clk[IMX21_CLK_SDHC1_IPG_GATE] = imx_clk_gate("sdhc1_ipg_gate", "ipg", CCM_PCCR0, 9);
+	clk[IMX21_CLK_SDHC2_IPG_GATE] = imx_clk_gate("sdhc2_ipg_gate", "ipg", CCM_PCCR0, 10);
+	clk[IMX21_CLK_GPIO_GATE] = imx_clk_gate("gpio_gate", "ipg", CCM_PCCR0, 11);
+	clk[IMX21_CLK_I2C_GATE] = imx_clk_gate("i2c_gate", "ipg", CCM_PCCR0, 12);
+	clk[IMX21_CLK_DMA_GATE] = imx_clk_gate("dma_gate", "ipg", CCM_PCCR0, 13);
+	clk[IMX21_CLK_USB_GATE] = imx_clk_gate("usb_gate", "usb_div", CCM_PCCR0, 14);
+	clk[IMX21_CLK_EMMA_GATE] = imx_clk_gate("emma_gate", "ipg", CCM_PCCR0, 15);
+	clk[IMX21_CLK_SSI2_BAUD_GATE] = imx_clk_gate("ssi2_baud_gate", "ipg", CCM_PCCR0, 16);
+	clk[IMX21_CLK_SSI1_BAUD_GATE] = imx_clk_gate("ssi1_baud_gate", "ipg", CCM_PCCR0, 17);
+	clk[IMX21_CLK_LCDC_IPG_GATE] = imx_clk_gate("lcdc_ipg_gate", "ipg", CCM_PCCR0, 18);
+	clk[IMX21_CLK_NFC_GATE] = imx_clk_gate("nfc_gate", "nfc_div", CCM_PCCR0, 19);
+	clk[IMX21_CLK_SLCDC_HCLK_GATE] = imx_clk_gate("slcdc_hclk_gate", "hclk", CCM_PCCR0, 21);
+	clk[IMX21_CLK_PER4_GATE] = imx_clk_gate("per4_gate", "per4", CCM_PCCR0, 22);
+	clk[IMX21_CLK_BMI_GATE] = imx_clk_gate("bmi_gate", "hclk", CCM_PCCR0, 23);
+	clk[IMX21_CLK_USB_HCLK_GATE] = imx_clk_gate("usb_hclk_gate", "hclk", CCM_PCCR0, 24);
+	clk[IMX21_CLK_SLCDC_GATE] = imx_clk_gate("slcdc_gate", "hclk", CCM_PCCR0, 25);
+	clk[IMX21_CLK_LCDC_HCLK_GATE] = imx_clk_gate("lcdc_hclk_gate", "hclk", CCM_PCCR0, 26);
+	clk[IMX21_CLK_EMMA_HCLK_GATE] = imx_clk_gate("emma_hclk_gate", "hclk", CCM_PCCR0, 27);
+	clk[IMX21_CLK_BROM_GATE] = imx_clk_gate("brom_gate", "hclk", CCM_PCCR0, 28);
+	clk[IMX21_CLK_DMA_HCLK_GATE] = imx_clk_gate("dma_hclk_gate", "hclk", CCM_PCCR0, 30);
+	clk[IMX21_CLK_CSI_HCLK_GATE] = imx_clk_gate("csi_hclk_gate", "hclk", CCM_PCCR0, 31);
+
+	clk[IMX21_CLK_CSPI3_IPG_GATE] = imx_clk_gate("cspi3_ipg_gate", "ipg", CCM_PCCR1, 23);
+	clk[IMX21_CLK_WDOG_GATE] = imx_clk_gate("wdog_gate", "ipg", CCM_PCCR1, 24);
+	clk[IMX21_CLK_GPT1_IPG_GATE] = imx_clk_gate("gpt1_ipg_gate", "ipg", CCM_PCCR1, 25);
+	clk[IMX21_CLK_GPT2_IPG_GATE] = imx_clk_gate("gpt2_ipg_gate", "ipg", CCM_PCCR1, 26);
+	clk[IMX21_CLK_GPT3_IPG_GATE] = imx_clk_gate("gpt3_ipg_gate", "ipg", CCM_PCCR1, 27);
+	clk[IMX21_CLK_PWM_IPG_GATE] = imx_clk_gate("pwm_ipg_gate", "ipg", CCM_PCCR1, 28);
+	clk[IMX21_CLK_RTC_GATE] = imx_clk_gate("rtc_gate", "ipg", CCM_PCCR1, 29);
+	clk[IMX21_CLK_KPP_GATE] = imx_clk_gate("kpp_gate", "ipg", CCM_PCCR1, 30);
+	clk[IMX21_CLK_OWIRE_GATE] = imx_clk_gate("owire_gate", "ipg", CCM_PCCR1, 31);
 
 	imx_check_clocks(clk, ARRAY_SIZE(clk));
+}
 
-	clk_register_clkdev(clk[per1], "per", "imx21-uart.0");
-	clk_register_clkdev(clk[uart1_ipg_gate], "ipg", "imx21-uart.0");
-	clk_register_clkdev(clk[per1], "per", "imx21-uart.1");
-	clk_register_clkdev(clk[uart2_ipg_gate], "ipg", "imx21-uart.1");
-	clk_register_clkdev(clk[per1], "per", "imx21-uart.2");
-	clk_register_clkdev(clk[uart3_ipg_gate], "ipg", "imx21-uart.2");
-	clk_register_clkdev(clk[per1], "per", "imx21-uart.3");
-	clk_register_clkdev(clk[uart4_ipg_gate], "ipg", "imx21-uart.3");
-	clk_register_clkdev(clk[gpt1_ipg_gate], "ipg", "imx-gpt.0");
-	clk_register_clkdev(clk[per1], "per", "imx-gpt.0");
-	clk_register_clkdev(clk[per2], "per", "imx21-cspi.0");
-	clk_register_clkdev(clk[cspi1_ipg_gate], "ipg", "imx21-cspi.0");
-	clk_register_clkdev(clk[per2], "per", "imx21-cspi.1");
-	clk_register_clkdev(clk[cspi2_ipg_gate], "ipg", "imx21-cspi.1");
-	clk_register_clkdev(clk[per2], "per", "imx21-cspi.2");
-	clk_register_clkdev(clk[cspi3_ipg_gate], "ipg", "imx21-cspi.2");
-	clk_register_clkdev(clk[per3], "per", "imx21-fb.0");
-	clk_register_clkdev(clk[lcdc_ipg_gate], "ipg", "imx21-fb.0");
-	clk_register_clkdev(clk[lcdc_hclk_gate], "ahb", "imx21-fb.0");
-	clk_register_clkdev(clk[usb_gate], "per", "imx21-hcd.0");
-	clk_register_clkdev(clk[usb_hclk_gate], "ahb", "imx21-hcd.0");
-	clk_register_clkdev(clk[nfc_gate], NULL, "imx21-nand.0");
-	clk_register_clkdev(clk[dma_hclk_gate], "ahb", "imx21-dma");
-	clk_register_clkdev(clk[dma_gate], "ipg", "imx21-dma");
-	clk_register_clkdev(clk[wdog_gate], NULL, "imx2-wdt.0");
-	clk_register_clkdev(clk[i2c_gate], NULL, "imx21-i2c.0");
-	clk_register_clkdev(clk[owire_gate], NULL, "mxc_w1.0");
+int __init mx21_clocks_init(unsigned long lref, unsigned long href)
+{
+	ccm = ioremap(MX21_CCM_BASE_ADDR, SZ_2K);
+
+	_mx21_clocks_init(lref, href);
+
+	clk_register_clkdev(clk[IMX21_CLK_PER1], "per", "imx21-uart.0");
+	clk_register_clkdev(clk[IMX21_CLK_UART1_IPG_GATE], "ipg", "imx21-uart.0");
+	clk_register_clkdev(clk[IMX21_CLK_PER1], "per", "imx21-uart.1");
+	clk_register_clkdev(clk[IMX21_CLK_UART2_IPG_GATE], "ipg", "imx21-uart.1");
+	clk_register_clkdev(clk[IMX21_CLK_PER1], "per", "imx21-uart.2");
+	clk_register_clkdev(clk[IMX21_CLK_UART3_IPG_GATE], "ipg", "imx21-uart.2");
+	clk_register_clkdev(clk[IMX21_CLK_PER1], "per", "imx21-uart.3");
+	clk_register_clkdev(clk[IMX21_CLK_UART4_IPG_GATE], "ipg", "imx21-uart.3");
+	clk_register_clkdev(clk[IMX21_CLK_GPT1_IPG_GATE], "ipg", "imx-gpt.0");
+	clk_register_clkdev(clk[IMX21_CLK_PER1], "per", "imx-gpt.0");
+	clk_register_clkdev(clk[IMX21_CLK_PER2], "per", "imx21-cspi.0");
+	clk_register_clkdev(clk[IMX21_CLK_CSPI1_IPG_GATE], "ipg", "imx21-cspi.0");
+	clk_register_clkdev(clk[IMX21_CLK_PER2], "per", "imx21-cspi.1");
+	clk_register_clkdev(clk[IMX21_CLK_CSPI2_IPG_GATE], "ipg", "imx21-cspi.1");
+	clk_register_clkdev(clk[IMX21_CLK_PER2], "per", "imx21-cspi.2");
+	clk_register_clkdev(clk[IMX21_CLK_CSPI3_IPG_GATE], "ipg", "imx21-cspi.2");
+	clk_register_clkdev(clk[IMX21_CLK_PER3], "per", "imx21-fb.0");
+	clk_register_clkdev(clk[IMX21_CLK_LCDC_IPG_GATE], "ipg", "imx21-fb.0");
+	clk_register_clkdev(clk[IMX21_CLK_LCDC_HCLK_GATE], "ahb", "imx21-fb.0");
+	clk_register_clkdev(clk[IMX21_CLK_USB_GATE], "per", "imx21-hcd.0");
+	clk_register_clkdev(clk[IMX21_CLK_USB_HCLK_GATE], "ahb", "imx21-hcd.0");
+	clk_register_clkdev(clk[IMX21_CLK_NFC_GATE], NULL, "imx21-nand.0");
+	clk_register_clkdev(clk[IMX21_CLK_DMA_HCLK_GATE], "ahb", "imx21-dma");
+	clk_register_clkdev(clk[IMX21_CLK_DMA_GATE], "ipg", "imx21-dma");
+	clk_register_clkdev(clk[IMX21_CLK_WDOG_GATE], NULL, "imx2-wdt.0");
+	clk_register_clkdev(clk[IMX21_CLK_I2C_GATE], NULL, "imx21-i2c.0");
+	clk_register_clkdev(clk[IMX21_CLK_OWIRE_GATE], NULL, "mxc_w1.0");
 
 	mxc_timer_init(MX21_IO_ADDRESS(MX21_GPT1_BASE_ADDR), MX21_INT_GPT1);
 
 	return 0;
 }
+
+static void __init mx21_clocks_init_dt(struct device_node *np)
+{
+	ccm = of_iomap(np, 0);
+
+	_mx21_clocks_init(32768, 26000000);
+
+	clk_data.clks = clk;
+	clk_data.clk_num = ARRAY_SIZE(clk);
+	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+
+	mxc_timer_init_dt(of_find_compatible_node(NULL, NULL, "fsl,imx1-gpt"));
+}
+CLK_OF_DECLARE(imx27_ccm, "fsl,imx21-ccm", mx21_clocks_init_dt);
diff --git a/include/dt-bindings/clock/imx21-clock.h b/include/dt-bindings/clock/imx21-clock.h
new file mode 100644
index 000000000000..b13596cf51b2
--- /dev/null
+++ b/include/dt-bindings/clock/imx21-clock.h
@@ -0,0 +1,80 @@
+/*
+ * 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