arch/arm/mach-imx/clk-imx27.c

   1 #include <linux/clk.h>
   2 #include <linux/io.h>
   3 #include <linux/module.h>
   4 #include <linux/clkdev.h>
   5 #include <linux/err.h>
   6 #include <linux/clk-provider.h>
   7 #include <linux/of.h>
   8
   9 #include <mach/common.h>
  10 #include <mach/hardware.h>
  11 #include "clk.h"
  12
  13 #define IO_ADDR_CCM(off)        (MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR + (off)))
  14
  15 /* Register offsets */
  16 #define CCM_CSCR                IO_ADDR_CCM(0x0)
  17 #define CCM_MPCTL0              IO_ADDR_CCM(0x4)
  18 #define CCM_MPCTL1              IO_ADDR_CCM(0x8)
  19 #define CCM_SPCTL0              IO_ADDR_CCM(0xc)
  20 #define CCM_SPCTL1              IO_ADDR_CCM(0x10)
  21 #define CCM_OSC26MCTL           IO_ADDR_CCM(0x14)
  22 #define CCM_PCDR0               IO_ADDR_CCM(0x18)
  23 #define CCM_PCDR1               IO_ADDR_CCM(0x1c)
  24 #define CCM_PCCR0               IO_ADDR_CCM(0x20)
  25 #define CCM_PCCR1               IO_ADDR_CCM(0x24)
  26 #define CCM_CCSR                IO_ADDR_CCM(0x28)
  27 #define CCM_PMCTL               IO_ADDR_CCM(0x2c)
  28 #define CCM_PMCOUNT             IO_ADDR_CCM(0x30)
  29 #define CCM_WKGDCTL             IO_ADDR_CCM(0x34)
  30
  31 #define CCM_CSCR_UPDATE_DIS     (1 << 31)
  32 #define CCM_CSCR_SSI2           (1 << 23)
  33 #define CCM_CSCR_SSI1           (1 << 22)
  34 #define CCM_CSCR_VPU            (1 << 21)
  35 #define CCM_CSCR_MSHC           (1 << 20)
  36 #define CCM_CSCR_SPLLRES        (1 << 19)
  37 #define CCM_CSCR_MPLLRES        (1 << 18)
  38 #define CCM_CSCR_SP             (1 << 17)
  39 #define CCM_CSCR_MCU            (1 << 16)
  40 #define CCM_CSCR_OSC26MDIV      (1 << 4)
  41 #define CCM_CSCR_OSC26M         (1 << 3)
  42 #define CCM_CSCR_FPM            (1 << 2)
  43 #define CCM_CSCR_SPEN           (1 << 1)
  44 #define CCM_CSCR_MPEN           (1 << 0)
  45
  46 /* i.MX27 TO 2+ */
  47 #define CCM_CSCR_ARM_SRC        (1 << 15)
  48
  49 #define CCM_SPCTL1_LF           (1 << 15)
  50 #define CCM_SPCTL1_BRMO         (1 << 6)
  51
  52 static const char *vpu_sel_clks[] = { "spll", "mpll_main2", };
  53 static const char *cpu_sel_clks[] = { "mpll_main2", "mpll", };
  54 static const char *clko_sel_clks[] = {
  55         "ckil", "prem", "ckih", "ckih",
  56         "ckih", "mpll", "spll", "cpu_div",
  57         "ahb", "ipg", "per1_div", "per2_div",
  58         "per3_div", "per4_div", "ssi1_div", "ssi2_div",
  59         "nfc_div", "mshc_div", "vpu_div", "60m",
  60         "32k", "usb_div", "dptc",
  61 };
  62
  63 static const char *ssi_sel_clks[] = { "spll", "mpll", };
  64
  65 enum mx27_clks {
  66         dummy, ckih, ckil, mpll, spll, mpll_main2, ahb, ipg, nfc_div, per1_div,
  67         per2_div, per3_div, per4_div, vpu_sel, vpu_div, usb_div, cpu_sel,
  68         clko_sel, cpu_div, clko_div, ssi1_sel, ssi2_sel, ssi1_div, ssi2_div,
  69         clko_en, ssi2_ipg_gate, ssi1_ipg_gate, slcdc_ipg_gate, sdhc3_ipg_gate,
  70         sdhc2_ipg_gate, sdhc1_ipg_gate, scc_ipg_gate, sahara_ipg_gate,
  71         rtc_ipg_gate, pwm_ipg_gate, owire_ipg_gate, lcdc_ipg_gate,
  72         kpp_ipg_gate, iim_ipg_gate, i2c2_ipg_gate, i2c1_ipg_gate,
  73         gpt6_ipg_gate, gpt5_ipg_gate, gpt4_ipg_gate, gpt3_ipg_gate,
  74         gpt2_ipg_gate, gpt1_ipg_gate, gpio_ipg_gate, fec_ipg_gate,
  75         emma_ipg_gate, dma_ipg_gate, cspi3_ipg_gate, cspi2_ipg_gate,
  76         cspi1_ipg_gate, nfc_baud_gate, ssi2_baud_gate, ssi1_baud_gate,
  77         vpu_baud_gate, per4_gate, per3_gate, per2_gate, per1_gate,
  78         usb_ahb_gate, slcdc_ahb_gate, sahara_ahb_gate, lcdc_ahb_gate,
  79         vpu_ahb_gate, fec_ahb_gate, emma_ahb_gate, emi_ahb_gate, dma_ahb_gate,
  80         csi_ahb_gate, brom_ahb_gate, ata_ahb_gate, wdog_ipg_gate, usb_ipg_gate,
  81         uart6_ipg_gate, uart5_ipg_gate, uart4_ipg_gate, uart3_ipg_gate,
  82         uart2_ipg_gate, uart1_ipg_gate, clk_max
  83 };
  84
  85 static struct clk *clk[clk_max];
  86
  87 int __init mx27_clocks_init(unsigned long fref)
  88 {
  89         int i;
  90
  91         clk[dummy] = imx_clk_fixed("dummy", 0);
  92         clk[ckih] = imx_clk_fixed("ckih", fref);
  93         clk[ckil] = imx_clk_fixed("ckil", 32768);
  94         clk[mpll] = imx_clk_pllv1("mpll", "ckih", CCM_MPCTL0);
  95         clk[spll] = imx_clk_pllv1("spll", "ckih", CCM_SPCTL0);
  96         clk[mpll_main2] = imx_clk_fixed_factor("mpll_main2", "mpll", 2, 3);
  97
  98         if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
  99                 clk[ahb] = imx_clk_divider("ahb", "mpll_main2", CCM_CSCR, 8, 2);
 100                 clk[ipg] = imx_clk_fixed_factor("ipg", "ahb", 1, 2);
 101         } else {
 102                 clk[ahb] = imx_clk_divider("ahb", "mpll_main2", CCM_CSCR, 9, 4);
 103                 clk[ipg] = imx_clk_divider("ipg", "ahb", CCM_CSCR, 8, 1);
 104         }
 105
 106         clk[nfc_div] = imx_clk_divider("nfc_div", "ahb", CCM_PCDR0, 6, 4);
 107         clk[per1_div] = imx_clk_divider("per1_div", "mpll_main2", CCM_PCDR1, 0, 6);
 108         clk[per2_div] = imx_clk_divider("per2_div", "mpll_main2", CCM_PCDR1, 8, 6);
 109         clk[per3_div] = imx_clk_divider("per3_div", "mpll_main2", CCM_PCDR1, 16, 6);
 110         clk[per4_div] = imx_clk_divider("per4_div", "mpll_main2", CCM_PCDR1, 24, 6);
 111         clk[vpu_sel] = imx_clk_mux("vpu_sel", CCM_CSCR, 21, 1, vpu_sel_clks, ARRAY_SIZE(vpu_sel_clks));
 112         clk[vpu_div] = imx_clk_divider("vpu_div", "vpu_sel", CCM_PCDR0, 10, 3);
 113         clk[usb_div] = imx_clk_divider("usb_div", "spll", CCM_CSCR, 28, 3);
 114         clk[cpu_sel] = imx_clk_mux("cpu_sel", CCM_CSCR, 15, 1, cpu_sel_clks, ARRAY_SIZE(cpu_sel_clks));
 115         clk[clko_sel] = imx_clk_mux("clko_sel", CCM_CCSR, 0, 5, clko_sel_clks, ARRAY_SIZE(clko_sel_clks));
 116         if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
 117                 clk[cpu_div] = imx_clk_divider("cpu_div", "cpu_sel", CCM_CSCR, 12, 2);
 118         else
 119                 clk[cpu_div] = imx_clk_divider("cpu_div", "cpu_sel", CCM_CSCR, 13, 3);
 120         clk[clko_div] = imx_clk_divider("clko_div", "clko_sel", CCM_PCDR0, 22, 3);
 121         clk[ssi1_sel] = imx_clk_mux("ssi1_sel", CCM_CSCR, 22, 1, ssi_sel_clks, ARRAY_SIZE(ssi_sel_clks));
 122         clk[ssi2_sel] = imx_clk_mux("ssi2_sel", CCM_CSCR, 23, 1, ssi_sel_clks, ARRAY_SIZE(ssi_sel_clks));
 123         clk[ssi1_div] = imx_clk_divider("ssi1_div", "ssi1_sel", CCM_PCDR0, 16, 6);
 124         clk[ssi2_div] = imx_clk_divider("ssi2_div", "ssi2_sel", CCM_PCDR0, 26, 3);
 125         clk[clko_en] = imx_clk_gate("clko_en", "clko_div", CCM_PCCR0, 0);
 126         clk[ssi2_ipg_gate] = imx_clk_gate("ssi2_ipg_gate", "ipg", CCM_PCCR0, 0);
 127         clk[ssi1_ipg_gate] = imx_clk_gate("ssi1_ipg_gate", "ipg", CCM_PCCR0, 1);
 128         clk[slcdc_ipg_gate] = imx_clk_gate("slcdc_ipg_gate", "ipg", CCM_PCCR0, 2);
 129         clk[sdhc3_ipg_gate] = imx_clk_gate("sdhc3_ipg_gate", "ipg", CCM_PCCR0, 3);
 130         clk[sdhc2_ipg_gate] = imx_clk_gate("sdhc2_ipg_gate", "ipg", CCM_PCCR0, 4);
 131         clk[sdhc1_ipg_gate] = imx_clk_gate("sdhc1_ipg_gate", "ipg", CCM_PCCR0, 5);
 132         clk[scc_ipg_gate] = imx_clk_gate("scc_ipg_gate", "ipg", CCM_PCCR0, 6);
 133         clk[sahara_ipg_gate] = imx_clk_gate("sahara_ipg_gate", "ipg", CCM_PCCR0, 7);
 134         clk[rtc_ipg_gate] = imx_clk_gate("rtc_ipg_gate", "ipg", CCM_PCCR0, 9);
 135         clk[pwm_ipg_gate] = imx_clk_gate("pwm_ipg_gate", "ipg", CCM_PCCR0, 11);
 136         clk[owire_ipg_gate] = imx_clk_gate("owire_ipg_gate", "ipg", CCM_PCCR0, 12);
 137         clk[lcdc_ipg_gate] = imx_clk_gate("lcdc_ipg_gate", "ipg", CCM_PCCR0, 14);
 138         clk[kpp_ipg_gate] = imx_clk_gate("kpp_ipg_gate", "ipg", CCM_PCCR0, 15);
 139         clk[iim_ipg_gate] = imx_clk_gate("iim_ipg_gate", "ipg", CCM_PCCR0, 16);
 140         clk[i2c2_ipg_gate] = imx_clk_gate("i2c2_ipg_gate", "ipg", CCM_PCCR0, 17);
 141         clk[i2c1_ipg_gate] = imx_clk_gate("i2c1_ipg_gate", "ipg", CCM_PCCR0, 18);
 142         clk[gpt6_ipg_gate] = imx_clk_gate("gpt6_ipg_gate", "ipg", CCM_PCCR0, 19);
 143         clk[gpt5_ipg_gate] = imx_clk_gate("gpt5_ipg_gate", "ipg", CCM_PCCR0, 20);
 144         clk[gpt4_ipg_gate] = imx_clk_gate("gpt4_ipg_gate", "ipg", CCM_PCCR0, 21);
 145         clk[gpt3_ipg_gate] = imx_clk_gate("gpt3_ipg_gate", "ipg", CCM_PCCR0, 22);
 146         clk[gpt2_ipg_gate] = imx_clk_gate("gpt2_ipg_gate", "ipg", CCM_PCCR0, 23);
 147         clk[gpt1_ipg_gate] = imx_clk_gate("gpt1_ipg_gate", "ipg", CCM_PCCR0, 24);
 148         clk[gpio_ipg_gate] = imx_clk_gate("gpio_ipg_gate", "ipg", CCM_PCCR0, 25);
 149         clk[fec_ipg_gate] = imx_clk_gate("fec_ipg_gate", "ipg", CCM_PCCR0, 26);
 150         clk[emma_ipg_gate] = imx_clk_gate("emma_ipg_gate", "ipg", CCM_PCCR0, 27);
 151         clk[dma_ipg_gate] = imx_clk_gate("dma_ipg_gate", "ipg", CCM_PCCR0, 28);
 152         clk[cspi3_ipg_gate] = imx_clk_gate("cspi3_ipg_gate", "ipg", CCM_PCCR0, 29);
 153         clk[cspi2_ipg_gate] = imx_clk_gate("cspi2_ipg_gate", "ipg", CCM_PCCR0, 30);
 154         clk[cspi1_ipg_gate] = imx_clk_gate("cspi1_ipg_gate", "ipg", CCM_PCCR0, 31);
 155         clk[nfc_baud_gate] = imx_clk_gate("nfc_baud_gate", "nfc_div", CCM_PCCR1,  3);
 156         clk[ssi2_baud_gate] = imx_clk_gate("ssi2_baud_gate", "ssi2_div", CCM_PCCR1,  4);
 157         clk[ssi1_baud_gate] = imx_clk_gate("ssi1_baud_gate", "ssi1_div", CCM_PCCR1,  5);
 158         clk[vpu_baud_gate] = imx_clk_gate("vpu_baud_gate", "vpu_div", CCM_PCCR1,  6);
 159         clk[per4_gate] = imx_clk_gate("per4_gate", "per4_div", CCM_PCCR1,  7);
 160         clk[per3_gate] = imx_clk_gate("per3_gate", "per3_div", CCM_PCCR1,  8);
 161         clk[per2_gate] = imx_clk_gate("per2_gate", "per2_div", CCM_PCCR1,  9);
 162         clk[per1_gate] = imx_clk_gate("per1_gate", "per1_div", CCM_PCCR1, 10);
 163         clk[usb_ahb_gate] = imx_clk_gate("usb_ahb_gate", "ahb", CCM_PCCR1, 11);
 164         clk[slcdc_ahb_gate] = imx_clk_gate("slcdc_ahb_gate", "ahb", CCM_PCCR1, 12);
 165         clk[sahara_ahb_gate] = imx_clk_gate("sahara_ahb_gate", "ahb", CCM_PCCR1, 13);
 166         clk[lcdc_ahb_gate] = imx_clk_gate("lcdc_ahb_gate", "ahb", CCM_PCCR1, 15);
 167         clk[vpu_ahb_gate] = imx_clk_gate("vpu_ahb_gate", "ahb", CCM_PCCR1, 16);
 168         clk[fec_ahb_gate] = imx_clk_gate("fec_ahb_gate", "ahb", CCM_PCCR1, 17);
 169         clk[emma_ahb_gate] = imx_clk_gate("emma_ahb_gate", "ahb", CCM_PCCR1, 18);
 170         clk[emi_ahb_gate] = imx_clk_gate("emi_ahb_gate", "ahb", CCM_PCCR1, 19);
 171         clk[dma_ahb_gate] = imx_clk_gate("dma_ahb_gate", "ahb", CCM_PCCR1, 20);
 172         clk[csi_ahb_gate] = imx_clk_gate("csi_ahb_gate", "ahb", CCM_PCCR1, 21);
 173         clk[brom_ahb_gate] = imx_clk_gate("brom_ahb_gate", "ahb", CCM_PCCR1, 22);
 174         clk[ata_ahb_gate] = imx_clk_gate("ata_ahb_gate", "ahb", CCM_PCCR1, 23);
 175         clk[wdog_ipg_gate] = imx_clk_gate("wdog_ipg_gate", "ipg", CCM_PCCR1, 24);
 176         clk[usb_ipg_gate] = imx_clk_gate("usb_ipg_gate", "ipg", CCM_PCCR1, 25);
 177         clk[uart6_ipg_gate] = imx_clk_gate("uart6_ipg_gate", "ipg", CCM_PCCR1, 26);
 178         clk[uart5_ipg_gate] = imx_clk_gate("uart5_ipg_gate", "ipg", CCM_PCCR1, 27);
 179         clk[uart4_ipg_gate] = imx_clk_gate("uart4_ipg_gate", "ipg", CCM_PCCR1, 28);
 180         clk[uart3_ipg_gate] = imx_clk_gate("uart3_ipg_gate", "ipg", CCM_PCCR1, 29);
 181         clk[uart2_ipg_gate] = imx_clk_gate("uart2_ipg_gate", "ipg", CCM_PCCR1, 30);
 182         clk[uart1_ipg_gate] = imx_clk_gate("uart1_ipg_gate", "ipg", CCM_PCCR1, 31);
 183
 184         for (i = 0; i < ARRAY_SIZE(clk); i++)
 185                 if (IS_ERR(clk[i]))
 186                         pr_err("i.MX27 clk %d: register failed with %ld\n",
 187                                 i, PTR_ERR(clk[i]));
 188
 189         clk_register_clkdev(clk[uart1_ipg_gate], "ipg", "imx21-uart.0");
 190         clk_register_clkdev(clk[per1_gate], "per", "imx21-uart.0");
 191         clk_register_clkdev(clk[uart2_ipg_gate], "ipg", "imx21-uart.1");
 192         clk_register_clkdev(clk[per1_gate], "per", "imx21-uart.1");
 193         clk_register_clkdev(clk[uart3_ipg_gate], "ipg", "imx21-uart.2");
 194         clk_register_clkdev(clk[per1_gate], "per", "imx21-uart.2");
 195         clk_register_clkdev(clk[uart4_ipg_gate], "ipg", "imx21-uart.3");
 196         clk_register_clkdev(clk[per1_gate], "per", "imx21-uart.3");
 197         clk_register_clkdev(clk[uart5_ipg_gate], "ipg", "imx21-uart.4");
 198         clk_register_clkdev(clk[per1_gate], "per", "imx21-uart.4");
 199         clk_register_clkdev(clk[uart6_ipg_gate], "ipg", "imx21-uart.5");
 200         clk_register_clkdev(clk[per1_gate], "per", "imx21-uart.5");
 201         clk_register_clkdev(clk[gpt1_ipg_gate], "ipg", "imx-gpt.0");
 202         clk_register_clkdev(clk[per1_gate], "per", "imx-gpt.0");
 203         clk_register_clkdev(clk[gpt2_ipg_gate], "ipg", "imx-gpt.1");
 204         clk_register_clkdev(clk[per1_gate], "per", "imx-gpt.1");
 205         clk_register_clkdev(clk[gpt3_ipg_gate], "ipg", "imx-gpt.2");
 206         clk_register_clkdev(clk[per1_gate], "per", "imx-gpt.2");
 207         clk_register_clkdev(clk[gpt4_ipg_gate], "ipg", "imx-gpt.3");
 208         clk_register_clkdev(clk[per1_gate], "per", "imx-gpt.3");
 209         clk_register_clkdev(clk[gpt5_ipg_gate], "ipg", "imx-gpt.4");
 210         clk_register_clkdev(clk[per1_gate], "per", "imx-gpt.4");
 211         clk_register_clkdev(clk[gpt6_ipg_gate], "ipg", "imx-gpt.5");
 212         clk_register_clkdev(clk[per1_gate], "per", "imx-gpt.5");
 213         clk_register_clkdev(clk[pwm_ipg_gate], NULL, "mxc_pwm.0");
 214         clk_register_clkdev(clk[per2_gate], "per", "mxc-mmc.0");
 215         clk_register_clkdev(clk[sdhc1_ipg_gate], "ipg", "mxc-mmc.0");
 216         clk_register_clkdev(clk[per2_gate], "per", "mxc-mmc.1");
 217         clk_register_clkdev(clk[sdhc2_ipg_gate], "ipg", "mxc-mmc.1");
 218         clk_register_clkdev(clk[per2_gate], "per", "mxc-mmc.2");
 219         clk_register_clkdev(clk[sdhc2_ipg_gate], "ipg", "mxc-mmc.2");
 220         clk_register_clkdev(clk[cspi1_ipg_gate], NULL, "imx27-cspi.0");
 221         clk_register_clkdev(clk[cspi2_ipg_gate], NULL, "imx27-cspi.1");
 222         clk_register_clkdev(clk[cspi3_ipg_gate], NULL, "imx27-cspi.2");
 223         clk_register_clkdev(clk[per3_gate], "per", "imx-fb.0");
 224         clk_register_clkdev(clk[lcdc_ipg_gate], "ipg", "imx-fb.0");
 225         clk_register_clkdev(clk[lcdc_ahb_gate], "ahb", "imx-fb.0");
 226         clk_register_clkdev(clk[csi_ahb_gate], "ahb", "mx2-camera.0");
 227         clk_register_clkdev(clk[usb_div], "per", "fsl-usb2-udc");
 228         clk_register_clkdev(clk[usb_ipg_gate], "ipg", "fsl-usb2-udc");
 229         clk_register_clkdev(clk[usb_ahb_gate], "ahb", "fsl-usb2-udc");
 230         clk_register_clkdev(clk[usb_div], "per", "mxc-ehci.0");
 231         clk_register_clkdev(clk[usb_ipg_gate], "ipg", "mxc-ehci.0");
 232         clk_register_clkdev(clk[usb_ahb_gate], "ahb", "mxc-ehci.0");
 233         clk_register_clkdev(clk[usb_div], "per", "mxc-ehci.1");
 234         clk_register_clkdev(clk[usb_ipg_gate], "ipg", "mxc-ehci.1");
 235         clk_register_clkdev(clk[usb_ahb_gate], "ahb", "mxc-ehci.1");
 236         clk_register_clkdev(clk[usb_div], "per", "mxc-ehci.2");
 237         clk_register_clkdev(clk[usb_ipg_gate], "ipg", "mxc-ehci.2");
 238         clk_register_clkdev(clk[usb_ahb_gate], "ahb", "mxc-ehci.2");
 239         clk_register_clkdev(clk[ssi1_ipg_gate], NULL, "imx-ssi.0");
 240         clk_register_clkdev(clk[ssi2_ipg_gate], NULL, "imx-ssi.1");
 241         clk_register_clkdev(clk[nfc_baud_gate], NULL, "mxc_nand.0");
 242         clk_register_clkdev(clk[vpu_baud_gate], "per", "imx-vpu");
 243         clk_register_clkdev(clk[vpu_ahb_gate], "ahb", "imx-vpu");
 244         clk_register_clkdev(clk[dma_ahb_gate], "ahb", "imx-dma");
 245         clk_register_clkdev(clk[dma_ipg_gate], "ipg", "imx-dma");
 246         clk_register_clkdev(clk[fec_ipg_gate], "ipg", "imx27-fec.0");
 247         clk_register_clkdev(clk[fec_ahb_gate], "ahb", "imx27-fec.0");
 248         clk_register_clkdev(clk[wdog_ipg_gate], NULL, "imx2-wdt.0");
 249         clk_register_clkdev(clk[i2c1_ipg_gate], NULL, "imx-i2c.0");
 250         clk_register_clkdev(clk[i2c2_ipg_gate], NULL, "imx-i2c.1");
 251         clk_register_clkdev(clk[owire_ipg_gate], NULL, "mxc_w1.0");
 252         clk_register_clkdev(clk[kpp_ipg_gate], NULL, "imx-keypad");
 253         clk_register_clkdev(clk[emma_ahb_gate], "emma-ahb", "mx2-camera.0");
 254         clk_register_clkdev(clk[emma_ipg_gate], "emma-ipg", "mx2-camera.0");
 255         clk_register_clkdev(clk[emma_ahb_gate], "ahb", "m2m-emmaprp.0");
 256         clk_register_clkdev(clk[emma_ipg_gate], "ipg", "m2m-emmaprp.0");
 257         clk_register_clkdev(clk[iim_ipg_gate], "iim", NULL);
 258         clk_register_clkdev(clk[gpio_ipg_gate], "gpio", NULL);
 259         clk_register_clkdev(clk[brom_ahb_gate], "brom", NULL);
 260         clk_register_clkdev(clk[ata_ahb_gate], "ata", NULL);
 261         clk_register_clkdev(clk[rtc_ipg_gate], NULL, "mxc_rtc");
 262         clk_register_clkdev(clk[scc_ipg_gate], "scc", NULL);
 263         clk_register_clkdev(clk[cpu_div], "cpu", NULL);
 264         clk_register_clkdev(clk[emi_ahb_gate], "emi_ahb" , NULL);
 265         clk_register_clkdev(clk[ssi1_baud_gate], "bitrate" , "imx-ssi.0");
 266         clk_register_clkdev(clk[ssi2_baud_gate], "bitrate" , "imx-ssi.1");
 267
 268         mxc_timer_init(MX27_IO_ADDRESS(MX27_GPT1_BASE_ADDR), MX27_INT_GPT1);
 269
 270         clk_prepare_enable(clk[emi_ahb_gate]);
 271
 272         imx_print_silicon_rev("i.MX27", mx27_revision());
 273
 274         return 0;
 275 }
 276
 277 #ifdef CONFIG_OF
 278 int __init mx27_clocks_init_dt(void)
 279 {
 280         struct device_node *np;
 281         u32 fref = 26000000; /* default */
 282
 283         for_each_compatible_node(np, NULL, "fixed-clock") {
 284                 if (!of_device_is_compatible(np, "fsl,imx-osc26m"))
 285                         continue;
 286
 287                 if (!of_property_read_u32(np, "clock-frequency", &fref))
 288                         break;
 289         }
 290
 291         return mx27_clocks_init(fref);
 292 }
 293 #endif