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Diffstat (limited to 'arch/arm/mach-spear3xx/clock.c')
-rw-r--r--arch/arm/mach-spear3xx/clock.c431
1 files changed, 366 insertions, 65 deletions
diff --git a/arch/arm/mach-spear3xx/clock.c b/arch/arm/mach-spear3xx/clock.c
index 7ea8749ddf28..8ae4ad0326a9 100644
--- a/arch/arm/mach-spear3xx/clock.c
+++ b/arch/arm/mach-spear3xx/clock.c
@@ -60,12 +60,22 @@ static struct pll_clk_config pll1_config = {
.masks = &pll1_masks,
};
+/* pll rate configuration table, in ascending order of rates */
+struct pll_rate_tbl pll_rtbl[] = {
+ {.mode = 0, .m = 0x85, .n = 0x0C, .p = 0x1}, /* 266 MHz */
+ {.mode = 0, .m = 0xA6, .n = 0x0C, .p = 0x1}, /* 332 MHz */
+};
+
/* PLL1 clock */
static struct clk pll1_clk = {
+ .flags = ENABLED_ON_INIT,
.pclk = &osc_24m_clk,
.en_reg = PLL1_CTR,
.en_reg_bit = PLL_ENABLE,
+ .calc_rate = &pll_calc_rate,
.recalc = &pll_clk_recalc,
+ .set_rate = &pll_clk_set_rate,
+ .rate_config = {pll_rtbl, ARRAY_SIZE(pll_rtbl), 1},
.private_data = &pll1_config,
};
@@ -103,11 +113,22 @@ static struct bus_clk_config ahb_config = {
.masks = &ahb_masks,
};
+/* ahb rate configuration table, in ascending order of rates */
+struct bus_rate_tbl bus_rtbl[] = {
+ {.div = 3}, /* == parent divided by 4 */
+ {.div = 2}, /* == parent divided by 3 */
+ {.div = 1}, /* == parent divided by 2 */
+ {.div = 0}, /* == parent divided by 1 */
+};
+
/* ahb clock */
static struct clk ahb_clk = {
.flags = ALWAYS_ENABLED,
.pclk = &pll1_clk,
+ .calc_rate = &bus_calc_rate,
.recalc = &bus_clk_recalc,
+ .set_rate = &bus_clk_set_rate,
+ .rate_config = {bus_rtbl, ARRAY_SIZE(bus_rtbl), 2},
.private_data = &ahb_config,
};
@@ -123,22 +144,40 @@ static struct aux_clk_masks aux_masks = {
.yscale_sel_shift = AUX_YSCALE_SHIFT,
};
-/* uart configurations */
-static struct aux_clk_config uart_config = {
+/* uart synth configurations */
+static struct aux_clk_config uart_synth_config = {
.synth_reg = UART_CLK_SYNT,
.masks = &aux_masks,
};
+/* aux rate configuration table, in ascending order of rates */
+struct aux_rate_tbl aux_rtbl[] = {
+ /* For PLL1 = 332 MHz */
+ {.xscale = 1, .yscale = 8, .eq = 1}, /* 41.5 MHz */
+ {.xscale = 1, .yscale = 4, .eq = 1}, /* 83 MHz */
+ {.xscale = 1, .yscale = 2, .eq = 1}, /* 166 MHz */
+};
+
+/* uart synth clock */
+static struct clk uart_synth_clk = {
+ .en_reg = UART_CLK_SYNT,
+ .en_reg_bit = AUX_SYNT_ENB,
+ .pclk = &pll1_clk,
+ .calc_rate = &aux_calc_rate,
+ .recalc = &aux_clk_recalc,
+ .set_rate = &aux_clk_set_rate,
+ .rate_config = {aux_rtbl, ARRAY_SIZE(aux_rtbl), 1},
+ .private_data = &uart_synth_config,
+};
+
/* uart parents */
static struct pclk_info uart_pclk_info[] = {
{
- .pclk = &pll1_clk,
- .pclk_mask = AUX_CLK_PLL1_MASK,
- .scalable = 1,
+ .pclk = &uart_synth_clk,
+ .pclk_val = AUX_CLK_PLL1_VAL,
}, {
.pclk = &pll3_48m_clk,
- .pclk_mask = AUX_CLK_PLL3_MASK,
- .scalable = 0,
+ .pclk_val = AUX_CLK_PLL3_VAL,
},
};
@@ -156,26 +195,35 @@ static struct clk uart_clk = {
.en_reg_bit = UART_CLK_ENB,
.pclk_sel = &uart_pclk_sel,
.pclk_sel_shift = UART_CLK_SHIFT,
- .recalc = &aux_clk_recalc,
- .private_data = &uart_config,
+ .recalc = &follow_parent,
};
/* firda configurations */
-static struct aux_clk_config firda_config = {
+static struct aux_clk_config firda_synth_config = {
.synth_reg = FIRDA_CLK_SYNT,
.masks = &aux_masks,
};
+/* firda synth clock */
+static struct clk firda_synth_clk = {
+ .en_reg = FIRDA_CLK_SYNT,
+ .en_reg_bit = AUX_SYNT_ENB,
+ .pclk = &pll1_clk,
+ .calc_rate = &aux_calc_rate,
+ .recalc = &aux_clk_recalc,
+ .set_rate = &aux_clk_set_rate,
+ .rate_config = {aux_rtbl, ARRAY_SIZE(aux_rtbl), 1},
+ .private_data = &firda_synth_config,
+};
+
/* firda parents */
static struct pclk_info firda_pclk_info[] = {
{
- .pclk = &pll1_clk,
- .pclk_mask = AUX_CLK_PLL1_MASK,
- .scalable = 1,
+ .pclk = &firda_synth_clk,
+ .pclk_val = AUX_CLK_PLL1_VAL,
}, {
.pclk = &pll3_48m_clk,
- .pclk_mask = AUX_CLK_PLL3_MASK,
- .scalable = 0,
+ .pclk_val = AUX_CLK_PLL3_VAL,
},
};
@@ -193,84 +241,155 @@ static struct clk firda_clk = {
.en_reg_bit = FIRDA_CLK_ENB,
.pclk_sel = &firda_pclk_sel,
.pclk_sel_shift = FIRDA_CLK_SHIFT,
- .recalc = &aux_clk_recalc,
- .private_data = &firda_config,
+ .recalc = &follow_parent,
+};
+
+/* gpt synthesizer masks */
+static struct gpt_clk_masks gpt_masks = {
+ .mscale_sel_mask = GPT_MSCALE_MASK,
+ .mscale_sel_shift = GPT_MSCALE_SHIFT,
+ .nscale_sel_mask = GPT_NSCALE_MASK,
+ .nscale_sel_shift = GPT_NSCALE_SHIFT,
+};
+
+/* gpt rate configuration table, in ascending order of rates */
+struct gpt_rate_tbl gpt_rtbl[] = {
+ /* For pll1 = 332 MHz */
+ {.mscale = 4, .nscale = 0}, /* 41.5 MHz */
+ {.mscale = 2, .nscale = 0}, /* 55.3 MHz */
+ {.mscale = 1, .nscale = 0}, /* 83 MHz */
+};
+
+/* gpt0 synth clk config*/
+static struct gpt_clk_config gpt0_synth_config = {
+ .synth_reg = PRSC1_CLK_CFG,
+ .masks = &gpt_masks,
+};
+
+/* gpt synth clock */
+static struct clk gpt0_synth_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &pll1_clk,
+ .calc_rate = &gpt_calc_rate,
+ .recalc = &gpt_clk_recalc,
+ .set_rate = &gpt_clk_set_rate,
+ .rate_config = {gpt_rtbl, ARRAY_SIZE(gpt_rtbl), 2},
+ .private_data = &gpt0_synth_config,
};
/* gpt parents */
-static struct pclk_info gpt_pclk_info[] = {
+static struct pclk_info gpt0_pclk_info[] = {
{
- .pclk = &pll1_clk,
- .pclk_mask = AUX_CLK_PLL1_MASK,
- .scalable = 1,
+ .pclk = &gpt0_synth_clk,
+ .pclk_val = AUX_CLK_PLL1_VAL,
}, {
.pclk = &pll3_48m_clk,
- .pclk_mask = AUX_CLK_PLL3_MASK,
- .scalable = 0,
+ .pclk_val = AUX_CLK_PLL3_VAL,
},
};
/* gpt parent select structure */
-static struct pclk_sel gpt_pclk_sel = {
- .pclk_info = gpt_pclk_info,
- .pclk_count = ARRAY_SIZE(gpt_pclk_info),
+static struct pclk_sel gpt0_pclk_sel = {
+ .pclk_info = gpt0_pclk_info,
+ .pclk_count = ARRAY_SIZE(gpt0_pclk_info),
.pclk_sel_reg = PERIP_CLK_CFG,
.pclk_sel_mask = GPT_CLK_MASK,
};
-/* gpt synthesizer masks */
-static struct gpt_clk_masks gpt_masks = {
- .mscale_sel_mask = GPT_MSCALE_MASK,
- .mscale_sel_shift = GPT_MSCALE_SHIFT,
- .nscale_sel_mask = GPT_NSCALE_MASK,
- .nscale_sel_shift = GPT_NSCALE_SHIFT,
+/* gpt0 timer clock */
+static struct clk gpt0_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk_sel = &gpt0_pclk_sel,
+ .pclk_sel_shift = GPT0_CLK_SHIFT,
+ .recalc = &follow_parent,
};
-/* gpt0 configurations */
-static struct gpt_clk_config gpt0_config = {
- .synth_reg = PRSC1_CLK_CFG,
+/* gpt1 synth clk configurations */
+static struct gpt_clk_config gpt1_synth_config = {
+ .synth_reg = PRSC2_CLK_CFG,
.masks = &gpt_masks,
};
-/* gpt0 timer clock */
-static struct clk gpt0_clk = {
+/* gpt1 synth clock */
+static struct clk gpt1_synth_clk = {
.flags = ALWAYS_ENABLED,
- .pclk_sel = &gpt_pclk_sel,
- .pclk_sel_shift = GPT0_CLK_SHIFT,
+ .pclk = &pll1_clk,
+ .calc_rate = &gpt_calc_rate,
.recalc = &gpt_clk_recalc,
- .private_data = &gpt0_config,
+ .set_rate = &gpt_clk_set_rate,
+ .rate_config = {gpt_rtbl, ARRAY_SIZE(gpt_rtbl), 2},
+ .private_data = &gpt1_synth_config,
};
-/* gpt1 configurations */
-static struct gpt_clk_config gpt1_config = {
- .synth_reg = PRSC2_CLK_CFG,
- .masks = &gpt_masks,
+static struct pclk_info gpt1_pclk_info[] = {
+ {
+ .pclk = &gpt1_synth_clk,
+ .pclk_val = AUX_CLK_PLL1_VAL,
+ }, {
+ .pclk = &pll3_48m_clk,
+ .pclk_val = AUX_CLK_PLL3_VAL,
+ },
+};
+
+/* gpt parent select structure */
+static struct pclk_sel gpt1_pclk_sel = {
+ .pclk_info = gpt1_pclk_info,
+ .pclk_count = ARRAY_SIZE(gpt1_pclk_info),
+ .pclk_sel_reg = PERIP_CLK_CFG,
+ .pclk_sel_mask = GPT_CLK_MASK,
};
/* gpt1 timer clock */
static struct clk gpt1_clk = {
.en_reg = PERIP1_CLK_ENB,
.en_reg_bit = GPT1_CLK_ENB,
- .pclk_sel = &gpt_pclk_sel,
+ .pclk_sel = &gpt1_pclk_sel,
.pclk_sel_shift = GPT1_CLK_SHIFT,
- .recalc = &gpt_clk_recalc,
- .private_data = &gpt1_config,
+ .recalc = &follow_parent,
};
-/* gpt2 configurations */
-static struct gpt_clk_config gpt2_config = {
+/* gpt2 synth clk configurations */
+static struct gpt_clk_config gpt2_synth_config = {
.synth_reg = PRSC3_CLK_CFG,
.masks = &gpt_masks,
};
+/* gpt1 synth clock */
+static struct clk gpt2_synth_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &pll1_clk,
+ .calc_rate = &gpt_calc_rate,
+ .recalc = &gpt_clk_recalc,
+ .set_rate = &gpt_clk_set_rate,
+ .rate_config = {gpt_rtbl, ARRAY_SIZE(gpt_rtbl), 2},
+ .private_data = &gpt2_synth_config,
+};
+
+static struct pclk_info gpt2_pclk_info[] = {
+ {
+ .pclk = &gpt2_synth_clk,
+ .pclk_val = AUX_CLK_PLL1_VAL,
+ }, {
+ .pclk = &pll3_48m_clk,
+ .pclk_val = AUX_CLK_PLL3_VAL,
+ },
+};
+
+/* gpt parent select structure */
+static struct pclk_sel gpt2_pclk_sel = {
+ .pclk_info = gpt2_pclk_info,
+ .pclk_count = ARRAY_SIZE(gpt2_pclk_info),
+ .pclk_sel_reg = PERIP_CLK_CFG,
+ .pclk_sel_mask = GPT_CLK_MASK,
+};
+
/* gpt2 timer clock */
static struct clk gpt2_clk = {
.en_reg = PERIP1_CLK_ENB,
.en_reg_bit = GPT2_CLK_ENB,
- .pclk_sel = &gpt_pclk_sel,
+ .pclk_sel = &gpt2_pclk_sel,
.pclk_sel_shift = GPT2_CLK_SHIFT,
- .recalc = &gpt_clk_recalc,
- .private_data = &gpt2_config,
+ .recalc = &follow_parent,
};
/* clock derived from pll3 clk */
@@ -290,13 +409,6 @@ static struct clk usbd_clk = {
.recalc = &follow_parent,
};
-/* clcd clock */
-static struct clk clcd_clk = {
- .flags = ALWAYS_ENABLED,
- .pclk = &pll3_48m_clk,
- .recalc = &follow_parent,
-};
-
/* clock derived from ahb clk */
/* apb masks structure */
static struct bus_clk_masks apb_masks = {
@@ -314,7 +426,10 @@ static struct bus_clk_config apb_config = {
static struct clk apb_clk = {
.flags = ALWAYS_ENABLED,
.pclk = &ahb_clk,
+ .calc_rate = &bus_calc_rate,
.recalc = &bus_clk_recalc,
+ .set_rate = &bus_clk_set_rate,
+ .rate_config = {bus_rtbl, ARRAY_SIZE(bus_rtbl), 2},
.private_data = &apb_config,
};
@@ -375,8 +490,17 @@ static struct clk adc_clk = {
.recalc = &follow_parent,
};
+#if defined(CONFIG_MACH_SPEAR310) || defined(CONFIG_MACH_SPEAR320)
+/* emi clock */
+static struct clk emi_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &ahb_clk,
+ .recalc = &follow_parent,
+};
+#endif
+
/* ssp clock */
-static struct clk ssp_clk = {
+static struct clk ssp0_clk = {
.pclk = &apb_clk,
.en_reg = PERIP1_CLK_ENB,
.en_reg_bit = SSP_CLK_ENB,
@@ -393,6 +517,137 @@ static struct clk gpio_clk = {
static struct clk dummy_apb_pclk;
+#if defined(CONFIG_MACH_SPEAR300) || defined(CONFIG_MACH_SPEAR310) || \
+ defined(CONFIG_MACH_SPEAR320)
+/* fsmc clock */
+static struct clk fsmc_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &ahb_clk,
+ .recalc = &follow_parent,
+};
+#endif
+
+/* common clocks to spear310 and spear320 */
+#if defined(CONFIG_MACH_SPEAR310) || defined(CONFIG_MACH_SPEAR320)
+/* uart1 clock */
+static struct clk uart1_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* uart2 clock */
+static struct clk uart2_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+#endif /* CONFIG_MACH_SPEAR310 || CONFIG_MACH_SPEAR320 */
+
+/* common clocks to spear300 and spear320 */
+#if defined(CONFIG_MACH_SPEAR300) || defined(CONFIG_MACH_SPEAR320)
+/* clcd clock */
+static struct clk clcd_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &pll3_48m_clk,
+ .recalc = &follow_parent,
+};
+
+/* sdhci clock */
+static struct clk sdhci_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &ahb_clk,
+ .recalc = &follow_parent,
+};
+#endif /* CONFIG_MACH_SPEAR300 || CONFIG_MACH_SPEAR320 */
+
+/* spear300 machine specific clock structures */
+#ifdef CONFIG_MACH_SPEAR300
+/* gpio1 clock */
+static struct clk gpio1_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* keyboard clock */
+static struct clk kbd_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+#endif
+
+/* spear310 machine specific clock structures */
+#ifdef CONFIG_MACH_SPEAR310
+/* uart3 clock */
+static struct clk uart3_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* uart4 clock */
+static struct clk uart4_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* uart5 clock */
+static struct clk uart5_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+#endif
+
+/* spear320 machine specific clock structures */
+#ifdef CONFIG_MACH_SPEAR320
+/* can0 clock */
+static struct clk can0_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* can1 clock */
+static struct clk can1_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* i2c1 clock */
+static struct clk i2c1_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &ahb_clk,
+ .recalc = &follow_parent,
+};
+
+/* ssp1 clock */
+static struct clk ssp1_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* ssp2 clock */
+static struct clk ssp2_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+
+/* pwm clock */
+static struct clk pwm_clk = {
+ .flags = ALWAYS_ENABLED,
+ .pclk = &apb_clk,
+ .recalc = &follow_parent,
+};
+#endif
+
/* array of all spear 3xx clock lookups */
static struct clk_lookup spear_clk_lookups[] = {
{ .con_id = "apb_pclk", .clk = &dummy_apb_pclk},
@@ -400,7 +655,7 @@ static struct clk_lookup spear_clk_lookups[] = {
{ .con_id = "osc_32k_clk", .clk = &osc_32k_clk},
{ .con_id = "osc_24m_clk", .clk = &osc_24m_clk},
/* clock derived from 32 KHz osc clk */
- { .dev_id = "rtc", .clk = &rtc_clk},
+ { .dev_id = "rtc-spear", .clk = &rtc_clk},
/* clock derived from 24 MHz osc clk */
{ .con_id = "pll1_clk", .clk = &pll1_clk},
{ .con_id = "pll3_48m_clk", .clk = &pll3_48m_clk},
@@ -408,18 +663,22 @@ static struct clk_lookup spear_clk_lookups[] = {
/* clock derived from pll1 clk */
{ .con_id = "cpu_clk", .clk = &cpu_clk},
{ .con_id = "ahb_clk", .clk = &ahb_clk},
+ { .con_id = "uart_synth_clk", .clk = &uart_synth_clk},
+ { .con_id = "firda_synth_clk", .clk = &firda_synth_clk},
+ { .con_id = "gpt0_synth_clk", .clk = &gpt0_synth_clk},
+ { .con_id = "gpt1_synth_clk", .clk = &gpt1_synth_clk},
+ { .con_id = "gpt2_synth_clk", .clk = &gpt2_synth_clk},
{ .dev_id = "uart", .clk = &uart_clk},
{ .dev_id = "firda", .clk = &firda_clk},
{ .dev_id = "gpt0", .clk = &gpt0_clk},
{ .dev_id = "gpt1", .clk = &gpt1_clk},
{ .dev_id = "gpt2", .clk = &gpt2_clk},
/* clock derived from pll3 clk */
- { .dev_id = "usbh", .clk = &usbh_clk},
+ { .con_id = "usbh_clk", .clk = &usbh_clk},
{ .dev_id = "usbd", .clk = &usbd_clk},
- { .dev_id = "clcd", .clk = &clcd_clk},
/* clock derived from ahb clk */
{ .con_id = "apb_clk", .clk = &apb_clk},
- { .dev_id = "i2c", .clk = &i2c_clk},
+ { .dev_id = "i2c_designware.0", .clk = &i2c_clk},
{ .dev_id = "dma", .clk = &dma_clk},
{ .dev_id = "jpeg", .clk = &jpeg_clk},
{ .dev_id = "gmac", .clk = &gmac_clk},
@@ -427,8 +686,50 @@ static struct clk_lookup spear_clk_lookups[] = {
{ .dev_id = "c3", .clk = &c3_clk},
/* clock derived from apb clk */
{ .dev_id = "adc", .clk = &adc_clk},
- { .dev_id = "ssp", .clk = &ssp_clk},
+ { .dev_id = "ssp-pl022.0", .clk = &ssp0_clk},
{ .dev_id = "gpio", .clk = &gpio_clk},
+#if defined(CONFIG_MACH_SPEAR310) || defined(CONFIG_MACH_SPEAR320)
+ { .dev_id = "physmap-flash", .clk = &emi_clk},
+#endif
+#if defined(CONFIG_MACH_SPEAR300) || defined(CONFIG_MACH_SPEAR310) || \
+ defined(CONFIG_MACH_SPEAR320)
+ { .con_id = "fsmc", .clk = &fsmc_clk},
+#endif
+
+/* common clocks to spear310 and spear320 */
+#if defined(CONFIG_MACH_SPEAR310) || defined(CONFIG_MACH_SPEAR320)
+ { .dev_id = "uart1", .clk = &uart1_clk},
+ { .dev_id = "uart2", .clk = &uart2_clk},
+#endif
+
+ /* common clock to spear300 and spear320 */
+#if defined(CONFIG_MACH_SPEAR300) || defined(CONFIG_MACH_SPEAR320)
+ { .dev_id = "clcd", .clk = &clcd_clk},
+ { .dev_id = "sdhci", .clk = &sdhci_clk},
+#endif /* CONFIG_MACH_SPEAR300 || CONFIG_MACH_SPEAR320 */
+
+ /* spear300 machine specific clock structures */
+#ifdef CONFIG_MACH_SPEAR300
+ { .dev_id = "gpio1", .clk = &gpio1_clk},
+ { .dev_id = "keyboard", .clk = &kbd_clk},
+#endif
+
+ /* spear310 machine specific clock structures */
+#ifdef CONFIG_MACH_SPEAR310
+ { .dev_id = "uart3", .clk = &uart3_clk},
+ { .dev_id = "uart4", .clk = &uart4_clk},
+ { .dev_id = "uart5", .clk = &uart5_clk},
+
+#endif
+ /* spear320 machine specific clock structures */
+#ifdef CONFIG_MACH_SPEAR320
+ { .dev_id = "c_can_platform.0", .clk = &can0_clk},
+ { .dev_id = "c_can_platform.1", .clk = &can1_clk},
+ { .dev_id = "i2c_designware.1", .clk = &i2c1_clk},
+ { .dev_id = "ssp-pl022.1", .clk = &ssp1_clk},
+ { .dev_id = "ssp-pl022.2", .clk = &ssp2_clk},
+ { .dev_id = "pwm", .clk = &pwm_clk},
+#endif
};
void __init clk_init(void)