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linux/arch/arm/plat-s3c64xx/s3c6400-clock.c
Ben Dooks 87d26d2d11 ARM: S3C64XX: Fix possible clock look in EPLL and MPLL clock chains 
There is a possibility of a loop happening in the PLL output clock
chain on the S3C64XX series. clk_mpll's parent was set to be
clk_mout_mpll, but this is fed from clk_fout_epll (which is also
clk_mpll).

clk_mpll is meant to be the output from the MPLL, and clk_mout_mpll
is a seperate clock derived from the mux of clk_mpll and clk_fin_mpll
and thus should be considered a seperate clock.

Anything using clk_mpll directly really should not be relying on this
being the clock that is eventually routed to a peripheral, so remove the
loop and ensure that the clocks accurately represent the clock chain
in the device.

The clk_mpll is not being used outside of the s3c6400-clock.c code, so
this change should not break anything else.

Do the same for the EPLL.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2010-01-07 11:34:51 +09:00

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/* linux/arch/arm/plat-s3c64xx/s3c6400-clock.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C6400 based common clock support
*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/sysdev.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/map.h>
#include <plat/cpu-freq.h>
#include <plat/regs-clock.h>
#include <plat/clock.h>
#include <plat/cpu.h>
#include <plat/pll.h>
/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
* ext_xtal_mux for want of an actual name from the manual.
*/
static struct clk clk_ext_xtal_mux = {
.name = "ext_xtal",
.id = -1,
};
#define clk_fin_apll clk_ext_xtal_mux
#define clk_fin_mpll clk_ext_xtal_mux
#define clk_fin_epll clk_ext_xtal_mux
#define clk_fout_mpll clk_mpll
#define clk_fout_epll clk_epll
struct clk_sources {
unsigned int nr_sources;
struct clk **sources;
};
struct clksrc_clk {
struct clk clk;
unsigned int mask;
unsigned int shift;
struct clk_sources *sources;
unsigned int divider_shift;
void __iomem *reg_divider;
};
static struct clk clk_fout_apll = {
.name = "fout_apll",
.id = -1,
};
static struct clk *clk_src_apll_list[] = {
[0] = &clk_fin_apll,
[1] = &clk_fout_apll,
};
static struct clk_sources clk_src_apll = {
.sources = clk_src_apll_list,
.nr_sources = ARRAY_SIZE(clk_src_apll_list),
};
static struct clksrc_clk clk_mout_apll = {
.clk = {
.name = "mout_apll",
.id = -1,
},
.shift = S3C6400_CLKSRC_APLL_MOUT_SHIFT,
.mask = S3C6400_CLKSRC_APLL_MOUT,
.sources = &clk_src_apll,
};
static struct clk *clk_src_epll_list[] = {
[0] = &clk_fin_epll,
[1] = &clk_fout_epll,
};
static struct clk_sources clk_src_epll = {
.sources = clk_src_epll_list,
.nr_sources = ARRAY_SIZE(clk_src_epll_list),
};
static struct clksrc_clk clk_mout_epll = {
.clk = {
.name = "mout_epll",
.id = -1,
},
.shift = S3C6400_CLKSRC_EPLL_MOUT_SHIFT,
.mask = S3C6400_CLKSRC_EPLL_MOUT,
.sources = &clk_src_epll,
};
static struct clk *clk_src_mpll_list[] = {
[0] = &clk_fin_mpll,
[1] = &clk_fout_mpll,
};
static struct clk_sources clk_src_mpll = {
.sources = clk_src_mpll_list,
.nr_sources = ARRAY_SIZE(clk_src_mpll_list),
};
static struct clksrc_clk clk_mout_mpll = {
.clk = {
.name = "mout_mpll",
.id = -1,
},
.shift = S3C6400_CLKSRC_MPLL_MOUT_SHIFT,
.mask = S3C6400_CLKSRC_MPLL_MOUT,
.sources = &clk_src_mpll,
};
static unsigned int armclk_mask;
static unsigned long s3c64xx_clk_arm_get_rate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
u32 clkdiv;
/* divisor mask starts at bit0, so no need to shift */
clkdiv = __raw_readl(S3C_CLK_DIV0) & armclk_mask;
return rate / (clkdiv + 1);
}
static unsigned long s3c64xx_clk_arm_round_rate(struct clk *clk,
unsigned long rate)
{
unsigned long parent = clk_get_rate(clk->parent);
u32 div;
if (parent < rate)
return parent;
div = (parent / rate) - 1;
if (div > armclk_mask)
div = armclk_mask;
return parent / (div + 1);
}
static int s3c64xx_clk_arm_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long parent = clk_get_rate(clk->parent);
u32 div;
u32 val;
if (rate < parent / (armclk_mask + 1))
return -EINVAL;
rate = clk_round_rate(clk, rate);
div = clk_get_rate(clk->parent) / rate;
val = __raw_readl(S3C_CLK_DIV0);
val &= ~armclk_mask;
val |= (div - 1);
__raw_writel(val, S3C_CLK_DIV0);
return 0;
}
static struct clk clk_arm = {
.name = "armclk",
.id = -1,
.parent = &clk_mout_apll.clk,
.get_rate = s3c64xx_clk_arm_get_rate,
.set_rate = s3c64xx_clk_arm_set_rate,
.round_rate = s3c64xx_clk_arm_round_rate,
};
static unsigned long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
printk(KERN_DEBUG "%s: parent is %ld\n", __func__, rate);
if (__raw_readl(S3C_CLK_DIV0) & S3C6400_CLKDIV0_MPLL_MASK)
rate /= 2;
return rate;
}
static struct clk clk_dout_mpll = {
.name = "dout_mpll",
.id = -1,
.parent = &clk_mout_mpll.clk,
.get_rate = s3c64xx_clk_doutmpll_get_rate,
};
static struct clk *clkset_spi_mmc_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll,
&clk_fin_epll,
&clk_27m,
};
static struct clk_sources clkset_spi_mmc = {
.sources = clkset_spi_mmc_list,
.nr_sources = ARRAY_SIZE(clkset_spi_mmc_list),
};
static struct clk *clkset_irda_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll,
NULL,
&clk_27m,
};
static struct clk_sources clkset_irda = {
.sources = clkset_irda_list,
.nr_sources = ARRAY_SIZE(clkset_irda_list),
};
static struct clk *clkset_uart_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll,
NULL,
NULL
};
static struct clk_sources clkset_uart = {
.sources = clkset_uart_list,
.nr_sources = ARRAY_SIZE(clkset_uart_list),
};
static struct clk *clkset_uhost_list[] = {
&clk_48m,
&clk_mout_epll.clk,
&clk_dout_mpll,
&clk_fin_epll,
};
static struct clk_sources clkset_uhost = {
.sources = clkset_uhost_list,
.nr_sources = ARRAY_SIZE(clkset_uhost_list),
};
/* The peripheral clocks are all controlled via clocksource followed
* by an optional divider and gate stage. We currently roll this into
* one clock which hides the intermediate clock from the mux.
*
* Note, the JPEG clock can only be an even divider...
*
* The scaler and LCD clocks depend on the S3C64XX version, and also
* have a common parent divisor so are not included here.
*/
static inline struct clksrc_clk *to_clksrc(struct clk *clk)
{
return container_of(clk, struct clksrc_clk, clk);
}
static unsigned long s3c64xx_getrate_clksrc(struct clk *clk)
{
struct clksrc_clk *sclk = to_clksrc(clk);
unsigned long rate = clk_get_rate(clk->parent);
u32 clkdiv = __raw_readl(sclk->reg_divider);
clkdiv >>= sclk->divider_shift;
clkdiv &= 0xf;
clkdiv++;
rate /= clkdiv;
return rate;
}
static int s3c64xx_setrate_clksrc(struct clk *clk, unsigned long rate)
{
struct clksrc_clk *sclk = to_clksrc(clk);
void __iomem *reg = sclk->reg_divider;
unsigned int div;
u32 val;
rate = clk_round_rate(clk, rate);
div = clk_get_rate(clk->parent) / rate;
if (div > 16)
return -EINVAL;
val = __raw_readl(reg);
val &= ~(0xf << sclk->divider_shift);
val |= (div - 1) << sclk->divider_shift;
__raw_writel(val, reg);
return 0;
}
static int s3c64xx_setparent_clksrc(struct clk *clk, struct clk *parent)
{
struct clksrc_clk *sclk = to_clksrc(clk);
struct clk_sources *srcs = sclk->sources;
u32 clksrc = __raw_readl(S3C_CLK_SRC);
int src_nr = -1;
int ptr;
for (ptr = 0; ptr < srcs->nr_sources; ptr++)
if (srcs->sources[ptr] == parent) {
src_nr = ptr;
break;
}
if (src_nr >= 0) {
clksrc &= ~sclk->mask;
clksrc |= src_nr << sclk->shift;
__raw_writel(clksrc, S3C_CLK_SRC);
clk->parent = parent;
return 0;
}
return -EINVAL;
}
static unsigned long s3c64xx_roundrate_clksrc(struct clk *clk,
unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
int div;
if (rate > parent_rate)
rate = parent_rate;
else {
div = parent_rate / rate;
if (div == 0)
div = 1;
if (div > 16)
div = 16;
rate = parent_rate / div;
}
return rate;
}
static struct clksrc_clk clk_mmc0 = {
.clk = {
.name = "mmc_bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_MMC0,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_MMC0_SHIFT,
.mask = S3C6400_CLKSRC_MMC0_MASK,
.sources = &clkset_spi_mmc,
.divider_shift = S3C6400_CLKDIV1_MMC0_SHIFT,
.reg_divider = S3C_CLK_DIV1,
};
static struct clksrc_clk clk_mmc1 = {
.clk = {
.name = "mmc_bus",
.id = 1,
.ctrlbit = S3C_CLKCON_SCLK_MMC1,
.enable = s3c64xx_sclk_ctrl,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.set_parent = s3c64xx_setparent_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_MMC1_SHIFT,
.mask = S3C6400_CLKSRC_MMC1_MASK,
.sources = &clkset_spi_mmc,
.divider_shift = S3C6400_CLKDIV1_MMC1_SHIFT,
.reg_divider = S3C_CLK_DIV1,
};
static struct clksrc_clk clk_mmc2 = {
.clk = {
.name = "mmc_bus",
.id = 2,
.ctrlbit = S3C_CLKCON_SCLK_MMC2,
.enable = s3c64xx_sclk_ctrl,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.set_parent = s3c64xx_setparent_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_MMC2_SHIFT,
.mask = S3C6400_CLKSRC_MMC2_MASK,
.sources = &clkset_spi_mmc,
.divider_shift = S3C6400_CLKDIV1_MMC2_SHIFT,
.reg_divider = S3C_CLK_DIV1,
};
static struct clksrc_clk clk_usbhost = {
.clk = {
.name = "usb-bus-host",
.id = -1,
.ctrlbit = S3C_CLKCON_SCLK_UHOST,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_UHOST_SHIFT,
.mask = S3C6400_CLKSRC_UHOST_MASK,
.sources = &clkset_uhost,
.divider_shift = S3C6400_CLKDIV1_UHOST_SHIFT,
.reg_divider = S3C_CLK_DIV1,
};
static struct clksrc_clk clk_uart_uclk1 = {
.clk = {
.name = "uclk1",
.id = -1,
.ctrlbit = S3C_CLKCON_SCLK_UART,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_UART_SHIFT,
.mask = S3C6400_CLKSRC_UART_MASK,
.sources = &clkset_uart,
.divider_shift = S3C6400_CLKDIV2_UART_SHIFT,
.reg_divider = S3C_CLK_DIV2,
};
/* Where does UCLK0 come from? */
static struct clksrc_clk clk_spi0 = {
.clk = {
.name = "spi-bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_SPI0,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_SPI0_SHIFT,
.mask = S3C6400_CLKSRC_SPI0_MASK,
.sources = &clkset_spi_mmc,
.divider_shift = S3C6400_CLKDIV2_SPI0_SHIFT,
.reg_divider = S3C_CLK_DIV2,
};
static struct clksrc_clk clk_spi1 = {
.clk = {
.name = "spi-bus",
.id = 1,
.ctrlbit = S3C_CLKCON_SCLK_SPI1,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_SPI1_SHIFT,
.mask = S3C6400_CLKSRC_SPI1_MASK,
.sources = &clkset_spi_mmc,
.divider_shift = S3C6400_CLKDIV2_SPI1_SHIFT,
.reg_divider = S3C_CLK_DIV2,
};
static struct clk clk_iis_cd0 = {
.name = "iis_cdclk0",
.id = -1,
};
static struct clk clk_iis_cd1 = {
.name = "iis_cdclk1",
.id = -1,
};
static struct clk clk_pcm_cd = {
.name = "pcm_cdclk",
.id = -1,
};
static struct clk *clkset_audio0_list[] = {
[0] = &clk_mout_epll.clk,
[1] = &clk_dout_mpll,
[2] = &clk_fin_epll,
[3] = &clk_iis_cd0,
[4] = &clk_pcm_cd,
};
static struct clk_sources clkset_audio0 = {
.sources = clkset_audio0_list,
.nr_sources = ARRAY_SIZE(clkset_audio0_list),
};
static struct clksrc_clk clk_audio0 = {
.clk = {
.name = "audio-bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_AUDIO0,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_AUDIO0_SHIFT,
.mask = S3C6400_CLKSRC_AUDIO0_MASK,
.sources = &clkset_audio0,
.divider_shift = S3C6400_CLKDIV2_AUDIO0_SHIFT,
.reg_divider = S3C_CLK_DIV2,
};
static struct clk *clkset_audio1_list[] = {
[0] = &clk_mout_epll.clk,
[1] = &clk_dout_mpll,
[2] = &clk_fin_epll,
[3] = &clk_iis_cd1,
[4] = &clk_pcm_cd,
};
static struct clk_sources clkset_audio1 = {
.sources = clkset_audio1_list,
.nr_sources = ARRAY_SIZE(clkset_audio1_list),
};
static struct clksrc_clk clk_audio1 = {
.clk = {
.name = "audio-bus",
.id = 1,
.ctrlbit = S3C_CLKCON_SCLK_AUDIO1,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_AUDIO1_SHIFT,
.mask = S3C6400_CLKSRC_AUDIO1_MASK,
.sources = &clkset_audio1,
.divider_shift = S3C6400_CLKDIV2_AUDIO1_SHIFT,
.reg_divider = S3C_CLK_DIV2,
};
static struct clksrc_clk clk_irda = {
.clk = {
.name = "irda-bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_IRDA,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = S3C6400_CLKSRC_IRDA_SHIFT,
.mask = S3C6400_CLKSRC_IRDA_MASK,
.sources = &clkset_irda,
.divider_shift = S3C6400_CLKDIV2_IRDA_SHIFT,
.reg_divider = S3C_CLK_DIV2,
};
static struct clk *clkset_camif_list[] = {
&clk_h2,
};
static struct clk_sources clkset_camif = {
.sources = clkset_camif_list,
.nr_sources = ARRAY_SIZE(clkset_camif_list),
};
static struct clksrc_clk clk_camif = {
.clk = {
.name = "camera",
.id = -1,
.ctrlbit = S3C_CLKCON_SCLK_CAM,
.enable = s3c64xx_sclk_ctrl,
.set_parent = s3c64xx_setparent_clksrc,
.get_rate = s3c64xx_getrate_clksrc,
.set_rate = s3c64xx_setrate_clksrc,
.round_rate = s3c64xx_roundrate_clksrc,
},
.shift = 0,
.mask = 0,
.sources = &clkset_camif,
.divider_shift = S3C6400_CLKDIV0_CAM_SHIFT,
.reg_divider = S3C_CLK_DIV0,
};
/* Clock initialisation code */
static struct clksrc_clk *init_parents[] = {
&clk_mout_apll,
&clk_mout_epll,
&clk_mout_mpll,
&clk_mmc0,
&clk_mmc1,
&clk_mmc2,
&clk_usbhost,
&clk_uart_uclk1,
&clk_spi0,
&clk_spi1,
&clk_audio0,
&clk_audio1,
&clk_irda,
&clk_camif,
};
static void __init_or_cpufreq s3c6400_set_clksrc(struct clksrc_clk *clk)
{
struct clk_sources *srcs = clk->sources;
u32 clksrc = __raw_readl(S3C_CLK_SRC);
clksrc &= clk->mask;
clksrc >>= clk->shift;
if (clksrc > srcs->nr_sources || !srcs->sources[clksrc]) {
printk(KERN_ERR "%s: bad source %d\n",
clk->clk.name, clksrc);
return;
}
clk->clk.parent = srcs->sources[clksrc];
printk(KERN_INFO "%s: source is %s (%d), rate is %ld\n",
clk->clk.name, clk->clk.parent->name, clksrc,
clk_get_rate(&clk->clk));
}
#define GET_DIV(clk, field) ((((clk) & field##_MASK) >> field##_SHIFT) + 1)
void __init_or_cpufreq s3c6400_setup_clocks(void)
{
struct clk *xtal_clk;
unsigned long xtal;
unsigned long fclk;
unsigned long hclk;
unsigned long hclk2;
unsigned long pclk;
unsigned long epll;
unsigned long apll;
unsigned long mpll;
unsigned int ptr;
u32 clkdiv0;
printk(KERN_DEBUG "%s: registering clocks\n", __func__);
clkdiv0 = __raw_readl(S3C_CLK_DIV0);
printk(KERN_DEBUG "%s: clkdiv0 = %08x\n", __func__, clkdiv0);
xtal_clk = clk_get(NULL, "xtal");
BUG_ON(IS_ERR(xtal_clk));
xtal = clk_get_rate(xtal_clk);
clk_put(xtal_clk);
printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
/* For now assume the mux always selects the crystal */
clk_ext_xtal_mux.parent = xtal_clk;
epll = s3c6400_get_epll(xtal);
mpll = s3c6400_get_pll(xtal, __raw_readl(S3C_MPLL_CON));
apll = s3c6400_get_pll(xtal, __raw_readl(S3C_APLL_CON));
fclk = mpll;
printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n",
apll, mpll, epll);
hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2);
hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK);
pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK);
printk(KERN_INFO "S3C64XX: HCLK2=%ld, HCLK=%ld, PCLK=%ld\n",
hclk2, hclk, pclk);
clk_fout_mpll.rate = mpll;
clk_fout_epll.rate = epll;
clk_fout_apll.rate = apll;
clk_h2.rate = hclk2;
clk_h.rate = hclk;
clk_p.rate = pclk;
clk_f.rate = fclk;
for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
s3c6400_set_clksrc(init_parents[ptr]);
}
static struct clk *clks[] __initdata = {
&clk_ext_xtal_mux,
&clk_iis_cd0,
&clk_iis_cd1,
&clk_pcm_cd,
&clk_mout_epll.clk,
&clk_mout_mpll.clk,
&clk_dout_mpll,
&clk_mmc0.clk,
&clk_mmc1.clk,
&clk_mmc2.clk,
&clk_usbhost.clk,
&clk_uart_uclk1.clk,
&clk_spi0.clk,
&clk_spi1.clk,
&clk_audio0.clk,
&clk_audio1.clk,
&clk_irda.clk,
&clk_camif.clk,
&clk_arm,
};
/**
* s3c6400_register_clocks - register clocks for s3c6400 and above
* @armclk_divlimit: Divisor mask for ARMCLK
*
* Register the clocks for the S3C6400 and above SoC range, such
* as ARMCLK and the clocks which have divider chains attached.
*
* This call does not setup the clocks, which is left to the
* s3c6400_setup_clocks() call which may be needed by the cpufreq
* or resume code to re-set the clocks if the bootloader has changed
* them.
*/
void __init s3c6400_register_clocks(unsigned armclk_divlimit)
{
struct clk *clkp;
int ret;
int ptr;
armclk_mask = armclk_divlimit;
for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
clkp = clks[ptr];
ret = s3c24xx_register_clock(clkp);
if (ret < 0) {
printk(KERN_ERR "Failed to register clock %s (%d)\n",
clkp->name, ret);
}
}
}
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