arch/sh/kernel/cpu/sh4a/clock-sh7724.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7724.c
   3  *
   4  * SH7724 clock framework support
   5  *
   6  * Copyright (C) 2009 Magnus Damm
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/io.h>
  24 #include <linux/clk.h>
  25 #include <linux/clkdev.h>
  26 #include <linux/sh_clk.h>
  27 #include <asm/clock.h>
  28 #include <cpu/sh7724.h>
  29
  30 /* SH7724 registers */
  31 #define FRQCRA          0xa4150000
  32 #define FRQCRB          0xa4150004
  33 #define VCLKCR          0xa4150048
  34 #define FCLKACR         0xa4150008
  35 #define FCLKBCR         0xa415000c
  36 #define IRDACLKCR       0xa4150018
  37 #define PLLCR           0xa4150024
  38 #define MSTPCR0         0xa4150030
  39 #define MSTPCR1         0xa4150034
  40 #define MSTPCR2         0xa4150038
  41 #define SPUCLKCR        0xa415003c
  42 #define FLLFRQ          0xa4150050
  43 #define LSTATS          0xa4150060
  44
  45 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  46 static struct clk r_clk = {
  47         .rate           = 32768,
  48 };
  49
  50 /*
  51  * Default rate for the root input clock, reset this with clk_set_rate()
  52  * from the platform code.
  53  */
  54 static struct clk extal_clk = {
  55         .rate           = 33333333,
  56 };
  57
  58 /* The fll multiplies the 32khz r_clk, may be used instead of extal */
  59 static unsigned long fll_recalc(struct clk *clk)
  60 {
  61         unsigned long mult = 0;
  62         unsigned long div = 1;
  63
  64         if (__raw_readl(PLLCR) & 0x1000)
  65                 mult = __raw_readl(FLLFRQ) & 0x3ff;
  66
  67         if (__raw_readl(FLLFRQ) & 0x4000)
  68                 div = 2;
  69
  70         return (clk->parent->rate * mult) / div;
  71 }
  72
  73 static struct sh_clk_ops fll_clk_ops = {
  74         .recalc         = fll_recalc,
  75 };
  76
  77 static struct clk fll_clk = {
  78         .ops            = &fll_clk_ops,
  79         .parent         = &r_clk,
  80         .flags          = CLK_ENABLE_ON_INIT,
  81 };
  82
  83 static unsigned long pll_recalc(struct clk *clk)
  84 {
  85         unsigned long mult = 1;
  86
  87         if (__raw_readl(PLLCR) & 0x4000)
  88                 mult = (((__raw_readl(FRQCRA) >> 24) & 0x3f) + 1) * 2;
  89
  90         return clk->parent->rate * mult;
  91 }
  92
  93 static struct sh_clk_ops pll_clk_ops = {
  94         .recalc         = pll_recalc,
  95 };
  96
  97 static struct clk pll_clk = {
  98         .ops            = &pll_clk_ops,
  99         .flags          = CLK_ENABLE_ON_INIT,
 100 };
 101
 102 /* A fixed divide-by-3 block use by the div6 clocks */
 103 static unsigned long div3_recalc(struct clk *clk)
 104 {
 105         return clk->parent->rate / 3;
 106 }
 107
 108 static struct sh_clk_ops div3_clk_ops = {
 109         .recalc         = div3_recalc,
 110 };
 111
 112 static struct clk div3_clk = {
 113         .ops            = &div3_clk_ops,
 114         .parent         = &pll_clk,
 115 };
 116
 117 /* External input clock (pin name: FSIMCKA/FSIMCKB/DV_CLKI ) */
 118 struct clk sh7724_fsimcka_clk = {
 119 };
 120
 121 struct clk sh7724_fsimckb_clk = {
 122 };
 123
 124 struct clk sh7724_dv_clki = {
 125 };
 126
 127 static struct clk *main_clks[] = {
 128         &r_clk,
 129         &extal_clk,
 130         &fll_clk,
 131         &pll_clk,
 132         &div3_clk,
 133         &sh7724_fsimcka_clk,
 134         &sh7724_fsimckb_clk,
 135         &sh7724_dv_clki,
 136 };
 137
 138 static void div4_kick(struct clk *clk)
 139 {
 140         unsigned long value;
 141
 142         /* set KICK bit in FRQCRA to update hardware setting */
 143         value = __raw_readl(FRQCRA);
 144         value |= (1 << 31);
 145         __raw_writel(value, FRQCRA);
 146 }
 147
 148 static int divisors[] = { 2, 3, 4, 6, 8, 12, 16, 0, 24, 32, 36, 48, 0, 72 };
 149
 150 static struct clk_div_mult_table div4_div_mult_table = {
 151         .divisors = divisors,
 152         .nr_divisors = ARRAY_SIZE(divisors),
 153 };
 154
 155 static struct clk_div4_table div4_table = {
 156         .div_mult_table = &div4_div_mult_table,
 157         .kick = div4_kick,
 158 };
 159
 160 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_P, DIV4_M1, DIV4_NR };
 161
 162 #define DIV4(_reg, _bit, _mask, _flags) \
 163   SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
 164
 165 struct clk div4_clks[DIV4_NR] = {
 166         [DIV4_I] = DIV4(FRQCRA, 20, 0x2f7d, CLK_ENABLE_ON_INIT),
 167         [DIV4_SH] = DIV4(FRQCRA, 12, 0x2f7c, CLK_ENABLE_ON_INIT),
 168         [DIV4_B] = DIV4(FRQCRA, 8, 0x2f7c, CLK_ENABLE_ON_INIT),
 169         [DIV4_P] = DIV4(FRQCRA, 0, 0x2f7c, 0),
 170         [DIV4_M1] = DIV4(FRQCRB, 4, 0x2f7c, CLK_ENABLE_ON_INIT),
 171 };
 172
 173 enum { DIV6_V, DIV6_I, DIV6_S, DIV6_FA, DIV6_FB, DIV6_NR };
 174
 175 /* Indices are important - they are the actual src selecting values */
 176 static struct clk *common_parent[] = {
 177         [0] = &div3_clk,
 178         [1] = NULL,
 179 };
 180
 181 static struct clk *vclkcr_parent[8] = {
 182         [0] = &div3_clk,
 183         [2] = &sh7724_dv_clki,
 184         [4] = &extal_clk,
 185 };
 186
 187 static struct clk *fclkacr_parent[] = {
 188         [0] = &div3_clk,
 189         [1] = NULL,
 190         [2] = &sh7724_fsimcka_clk,
 191         [3] = NULL,
 192 };
 193
 194 static struct clk *fclkbcr_parent[] = {
 195         [0] = &div3_clk,
 196         [1] = NULL,
 197         [2] = &sh7724_fsimckb_clk,
 198         [3] = NULL,
 199 };
 200
 201 static struct clk div6_clks[DIV6_NR] = {
 202         [DIV6_V] = SH_CLK_DIV6_EXT(VCLKCR, 0,
 203                         vclkcr_parent, ARRAY_SIZE(vclkcr_parent), 12, 3),
 204         [DIV6_I] = SH_CLK_DIV6_EXT(IRDACLKCR, 0,
 205                         common_parent, ARRAY_SIZE(common_parent), 6, 1),
 206         [DIV6_S] = SH_CLK_DIV6_EXT(SPUCLKCR, CLK_ENABLE_ON_INIT,
 207                         common_parent, ARRAY_SIZE(common_parent), 6, 1),
 208         [DIV6_FA] = SH_CLK_DIV6_EXT(FCLKACR, 0,
 209                                       fclkacr_parent, ARRAY_SIZE(fclkacr_parent), 6, 2),
 210         [DIV6_FB] = SH_CLK_DIV6_EXT(FCLKBCR, 0,
 211                                       fclkbcr_parent, ARRAY_SIZE(fclkbcr_parent), 6, 2),
 212 };
 213
 214 static struct clk mstp_clks[HWBLK_NR] = {
 215         [HWBLK_TLB] = SH_CLK_MSTP32(&div4_clks[DIV4_I],     MSTPCR0, 31, CLK_ENABLE_ON_INIT),
 216         [HWBLK_IC] = SH_CLK_MSTP32(&div4_clks[DIV4_I],      MSTPCR0, 30, CLK_ENABLE_ON_INIT),
 217         [HWBLK_OC] = SH_CLK_MSTP32(&div4_clks[DIV4_I],      MSTPCR0, 29, CLK_ENABLE_ON_INIT),
 218         [HWBLK_RSMEM] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR0, 28, CLK_ENABLE_ON_INIT),
 219         [HWBLK_ILMEM] = SH_CLK_MSTP32(&div4_clks[DIV4_I],   MSTPCR0, 27, CLK_ENABLE_ON_INIT),
 220         [HWBLK_L2C] = SH_CLK_MSTP32(&div4_clks[DIV4_SH],    MSTPCR0, 26, CLK_ENABLE_ON_INIT),
 221         [HWBLK_FPU] = SH_CLK_MSTP32(&div4_clks[DIV4_I],     MSTPCR0, 24, CLK_ENABLE_ON_INIT),
 222         [HWBLK_INTC] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR0, 22, CLK_ENABLE_ON_INIT),
 223         [HWBLK_DMAC0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR0, 21, 0),
 224         [HWBLK_SHYWAY] = SH_CLK_MSTP32(&div4_clks[DIV4_SH], MSTPCR0, 20, CLK_ENABLE_ON_INIT),
 225         [HWBLK_HUDI] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR0, 19, 0),
 226         [HWBLK_UBC] = SH_CLK_MSTP32(&div4_clks[DIV4_I],     MSTPCR0, 17, 0),
 227         [HWBLK_TMU0] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR0, 15, 0),
 228         [HWBLK_CMT] = SH_CLK_MSTP32(&r_clk,                 MSTPCR0, 14, 0),
 229         [HWBLK_RWDT] = SH_CLK_MSTP32(&r_clk,                MSTPCR0, 13, 0),
 230         [HWBLK_DMAC1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR0, 12, 0),
 231         [HWBLK_TMU1] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR0, 10, 0),
 232         [HWBLK_SCIF0] = SH_CLK_MSTP32(&div4_clks[DIV4_P],   MSTPCR0, 9, 0),
 233         [HWBLK_SCIF1] = SH_CLK_MSTP32(&div4_clks[DIV4_P],   MSTPCR0, 8, 0),
 234         [HWBLK_SCIF2] = SH_CLK_MSTP32(&div4_clks[DIV4_P],   MSTPCR0, 7, 0),
 235         [HWBLK_SCIF3] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR0, 6, 0),
 236         [HWBLK_SCIF4] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR0, 5, 0),
 237         [HWBLK_SCIF5] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR0, 4, 0),
 238         [HWBLK_MSIOF0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 2, 0),
 239         [HWBLK_MSIOF1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],  MSTPCR0, 1, 0),
 240
 241         [HWBLK_KEYSC] = SH_CLK_MSTP32(&r_clk,               MSTPCR1, 12, 0),
 242         [HWBLK_RTC] = SH_CLK_MSTP32(&r_clk,                 MSTPCR1, 11, 0),
 243         [HWBLK_IIC0] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR1, 9, 0),
 244         [HWBLK_IIC1] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR1, 8, 0),
 245
 246         [HWBLK_MMC] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 29, 0),
 247         [HWBLK_ETHER] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR2, 28, 0),
 248         [HWBLK_ATAPI] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR2, 26, 0),
 249         [HWBLK_TPU] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 25, 0),
 250         [HWBLK_IRDA] = SH_CLK_MSTP32(&div4_clks[DIV4_P],    MSTPCR2, 24, 0),
 251         [HWBLK_TSIF] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 22, 0),
 252         [HWBLK_USB1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 21, 0),
 253         [HWBLK_USB0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 20, 0),
 254         [HWBLK_2DG] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 19, 0),
 255         [HWBLK_SDHI0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR2, 18, 0),
 256         [HWBLK_SDHI1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],   MSTPCR2, 17, 0),
 257         [HWBLK_VEU1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 15, 0),
 258         [HWBLK_CEU1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 13, 0),
 259         [HWBLK_BEU1] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 12, 0),
 260         [HWBLK_2DDMAC] = SH_CLK_MSTP32(&div4_clks[DIV4_SH], MSTPCR2, 10, 0),
 261         [HWBLK_SPU] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 9, 0),
 262         [HWBLK_JPU] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 6, 0),
 263         [HWBLK_VOU] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 5, 0),
 264         [HWBLK_BEU0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 4, 0),
 265         [HWBLK_CEU0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 3, 0),
 266         [HWBLK_VEU0] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 2, 0),
 267         [HWBLK_VPU] = SH_CLK_MSTP32(&div4_clks[DIV4_B],     MSTPCR2, 1, 0),
 268         [HWBLK_LCDC] = SH_CLK_MSTP32(&div4_clks[DIV4_B],    MSTPCR2, 0, 0),
 269 };
 270
 271 static struct clk_lookup lookups[] = {
 272         /* main clocks */
 273         CLKDEV_CON_ID("rclk", &r_clk),
 274         CLKDEV_CON_ID("extal", &extal_clk),
 275         CLKDEV_CON_ID("fll_clk", &fll_clk),
 276         CLKDEV_CON_ID("pll_clk", &pll_clk),
 277         CLKDEV_CON_ID("div3_clk", &div3_clk),
 278
 279         /* DIV4 clocks */
 280         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 281         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 282         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 283         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 284         CLKDEV_CON_ID("vpu_clk", &div4_clks[DIV4_M1]),
 285
 286         /* DIV6 clocks */
 287         CLKDEV_CON_ID("video_clk", &div6_clks[DIV6_V]),
 288         CLKDEV_CON_ID("fsia_clk", &div6_clks[DIV6_FA]),
 289         CLKDEV_CON_ID("fsib_clk", &div6_clks[DIV6_FB]),
 290         CLKDEV_CON_ID("irda_clk", &div6_clks[DIV6_I]),
 291         CLKDEV_CON_ID("spu_clk", &div6_clks[DIV6_S]),
 292
 293         /* MSTP clocks */
 294         CLKDEV_CON_ID("tlb0", &mstp_clks[HWBLK_TLB]),
 295         CLKDEV_CON_ID("ic0", &mstp_clks[HWBLK_IC]),
 296         CLKDEV_CON_ID("oc0", &mstp_clks[HWBLK_OC]),
 297         CLKDEV_CON_ID("rs0", &mstp_clks[HWBLK_RSMEM]),
 298         CLKDEV_CON_ID("ilmem0", &mstp_clks[HWBLK_ILMEM]),
 299         CLKDEV_CON_ID("l2c0", &mstp_clks[HWBLK_L2C]),
 300         CLKDEV_CON_ID("fpu0", &mstp_clks[HWBLK_FPU]),
 301         CLKDEV_CON_ID("intc0", &mstp_clks[HWBLK_INTC]),
 302         CLKDEV_DEV_ID("sh-dma-engine.0", &mstp_clks[HWBLK_DMAC0]),
 303         CLKDEV_CON_ID("sh0", &mstp_clks[HWBLK_SHYWAY]),
 304         CLKDEV_CON_ID("hudi0", &mstp_clks[HWBLK_HUDI]),
 305         CLKDEV_CON_ID("ubc0", &mstp_clks[HWBLK_UBC]),
 306
 307         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[HWBLK_TMU0]),
 308         CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[HWBLK_TMU1]),
 309
 310         CLKDEV_ICK_ID("fck", "sh-cmt-32.0", &mstp_clks[HWBLK_CMT]),
 311         CLKDEV_DEV_ID("sh-wdt.0", &mstp_clks[HWBLK_RWDT]),
 312         CLKDEV_DEV_ID("sh-dma-engine.1", &mstp_clks[HWBLK_DMAC1]),
 313
 314         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[HWBLK_SCIF0]),
 315         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[HWBLK_SCIF1]),
 316         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[HWBLK_SCIF2]),
 317         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[HWBLK_SCIF3]),
 318         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[HWBLK_SCIF4]),
 319         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[HWBLK_SCIF5]),
 320
 321         CLKDEV_DEV_ID("spi_sh_msiof.0", &mstp_clks[HWBLK_MSIOF0]),
 322         CLKDEV_DEV_ID("spi_sh_msiof.1", &mstp_clks[HWBLK_MSIOF1]),
 323         CLKDEV_DEV_ID("sh_keysc.0", &mstp_clks[HWBLK_KEYSC]),
 324         CLKDEV_CON_ID("rtc0", &mstp_clks[HWBLK_RTC]),
 325         CLKDEV_DEV_ID("i2c-sh_mobile.0", &mstp_clks[HWBLK_IIC0]),
 326         CLKDEV_DEV_ID("i2c-sh_mobile.1", &mstp_clks[HWBLK_IIC1]),
 327         CLKDEV_DEV_ID("sh_mmcif.0", &mstp_clks[HWBLK_MMC]),
 328         CLKDEV_DEV_ID("sh7724-ether.0", &mstp_clks[HWBLK_ETHER]),
 329         CLKDEV_CON_ID("atapi0", &mstp_clks[HWBLK_ATAPI]),
 330         CLKDEV_CON_ID("tpu0", &mstp_clks[HWBLK_TPU]),
 331         CLKDEV_CON_ID("irda0", &mstp_clks[HWBLK_IRDA]),
 332         CLKDEV_CON_ID("tsif0", &mstp_clks[HWBLK_TSIF]),
 333         CLKDEV_DEV_ID("renesas_usbhs.1", &mstp_clks[HWBLK_USB1]),
 334         CLKDEV_DEV_ID("renesas_usbhs.0", &mstp_clks[HWBLK_USB0]),
 335         CLKDEV_CON_ID("usb1", &mstp_clks[HWBLK_USB1]),
 336         CLKDEV_CON_ID("usb0", &mstp_clks[HWBLK_USB0]),
 337         CLKDEV_CON_ID("2dg0", &mstp_clks[HWBLK_2DG]),
 338         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[HWBLK_SDHI0]),
 339         CLKDEV_DEV_ID("sh_mobile_sdhi.1", &mstp_clks[HWBLK_SDHI1]),
 340         CLKDEV_CON_ID("veu1", &mstp_clks[HWBLK_VEU1]),
 341         CLKDEV_DEV_ID("sh_mobile_ceu.1", &mstp_clks[HWBLK_CEU1]),
 342         CLKDEV_CON_ID("beu1", &mstp_clks[HWBLK_BEU1]),
 343         CLKDEV_CON_ID("2ddmac0", &mstp_clks[HWBLK_2DDMAC]),
 344         CLKDEV_DEV_ID("sh_fsi.0", &mstp_clks[HWBLK_SPU]),
 345         CLKDEV_CON_ID("jpu0", &mstp_clks[HWBLK_JPU]),
 346         CLKDEV_DEV_ID("sh-vou.0", &mstp_clks[HWBLK_VOU]),
 347         CLKDEV_CON_ID("beu0", &mstp_clks[HWBLK_BEU0]),
 348         CLKDEV_DEV_ID("sh_mobile_ceu.0", &mstp_clks[HWBLK_CEU0]),
 349         CLKDEV_CON_ID("veu0", &mstp_clks[HWBLK_VEU0]),
 350         CLKDEV_CON_ID("vpu0", &mstp_clks[HWBLK_VPU]),
 351         CLKDEV_DEV_ID("sh_mobile_lcdc_fb.0", &mstp_clks[HWBLK_LCDC]),
 352 };
 353
 354 int __init arch_clk_init(void)
 355 {
 356         int k, ret = 0;
 357
 358         /* autodetect extal or fll configuration */
 359         if (__raw_readl(PLLCR) & 0x1000)
 360                 pll_clk.parent = &fll_clk;
 361         else
 362                 pll_clk.parent = &extal_clk;
 363
 364         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 365                 ret = clk_register(main_clks[k]);
 366
 367         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 368
 369         if (!ret)
 370                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 371
 372         if (!ret)
 373                 ret = sh_clk_div6_reparent_register(div6_clks, DIV6_NR);
 374
 375         if (!ret)
 376                 ret = sh_clk_mstp_register(mstp_clks, HWBLK_NR);
 377
 378         return ret;
 379 }