2 * Copyright (c) 2010-2015, NVIDIA CORPORATION. All rights reserved.
4 * SPDX-License-Identifier: GPL-2.0
7 /* Tegra SoC common clock control functions */
12 #include <asm/arch/clock.h>
13 #include <asm/arch/tegra.h>
14 #include <asm/arch-tegra/ap.h>
15 #include <asm/arch-tegra/clk_rst.h>
16 #include <asm/arch-tegra/pmc.h>
17 #include <asm/arch-tegra/timer.h>
22 * This is our record of the current clock rate of each clock. We don't
23 * fill all of these in since we are only really interested in clocks which
26 static unsigned pll_rate[CLOCK_ID_COUNT];
29 * The oscillator frequency is fixed to one of four set values. Based on this
30 * the other clocks are set up appropriately.
32 static unsigned osc_freq[CLOCK_OSC_FREQ_COUNT] = {
41 /* return 1 if a peripheral ID is in range */
42 #define clock_type_id_isvalid(id) ((id) >= 0 && \
43 (id) < CLOCK_TYPE_COUNT)
45 char pllp_valid = 1; /* PLLP is set up correctly */
47 /* return 1 if a periphc_internal_id is in range */
48 #define periphc_internal_id_isvalid(id) ((id) >= 0 && \
51 /* number of clock outputs of a PLL */
52 static const u8 pll_num_clkouts[] = {
61 int clock_get_osc_bypass(void)
63 struct clk_rst_ctlr *clkrst =
64 (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
67 reg = readl(&clkrst->crc_osc_ctrl);
68 return (reg & OSC_XOBP_MASK) >> OSC_XOBP_SHIFT;
71 /* Returns a pointer to the registers of the given pll */
72 static struct clk_pll *get_pll(enum clock_id clkid)
74 struct clk_rst_ctlr *clkrst =
75 (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
77 assert(clock_id_is_pll(clkid));
78 if (clkid >= (enum clock_id)TEGRA_CLK_PLLS) {
79 debug("%s: Invalid PLL %d\n", __func__, clkid);
82 return &clkrst->crc_pll[clkid];
85 __weak struct clk_pll_simple *clock_get_simple_pll(enum clock_id clkid)
90 int clock_ll_read_pll(enum clock_id clkid, u32 *divm, u32 *divn,
91 u32 *divp, u32 *cpcon, u32 *lfcon)
93 struct clk_pll *pll = get_pll(clkid);
94 struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
97 assert(clkid != CLOCK_ID_USB);
99 /* Safety check, adds to code size but is small */
100 if (!clock_id_is_pll(clkid) || clkid == CLOCK_ID_USB)
102 data = readl(&pll->pll_base);
103 *divm = (data >> pllinfo->m_shift) & pllinfo->m_mask;
104 *divn = (data >> pllinfo->n_shift) & pllinfo->n_mask;
105 *divp = (data >> pllinfo->p_shift) & pllinfo->p_mask;
106 data = readl(&pll->pll_misc);
107 /* NOTE: On T210, cpcon/lfcon no longer exist, moved to KCP/KVCO */
108 *cpcon = (data >> pllinfo->kcp_shift) & pllinfo->kcp_mask;
109 *lfcon = (data >> pllinfo->kvco_shift) & pllinfo->kvco_mask;
114 unsigned long clock_start_pll(enum clock_id clkid, u32 divm, u32 divn,
115 u32 divp, u32 cpcon, u32 lfcon)
117 struct clk_pll *pll = NULL;
118 struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
119 struct clk_pll_simple *simple_pll = NULL;
122 if (clkid < (enum clock_id)TEGRA_CLK_PLLS) {
123 pll = get_pll(clkid);
125 simple_pll = clock_get_simple_pll(clkid);
127 debug("%s: Uknown simple PLL %d\n", __func__, clkid);
133 * pllinfo has the m/n/p and kcp/kvco mask and shift
134 * values for all of the PLLs used in U-Boot, with any
135 * SoC differences accounted for.
137 * Preserve EN_LOCKDET, etc.
140 misc_data = readl(&pll->pll_misc);
142 misc_data = readl(&simple_pll->pll_misc);
143 misc_data &= ~(pllinfo->kcp_mask << pllinfo->kcp_shift);
144 misc_data |= cpcon << pllinfo->kcp_shift;
145 misc_data &= ~(pllinfo->kvco_mask << pllinfo->kvco_shift);
146 misc_data |= lfcon << pllinfo->kvco_shift;
148 data = (divm << pllinfo->m_shift) | (divn << pllinfo->n_shift);
149 data |= divp << pllinfo->p_shift;
150 data |= (1 << PLL_ENABLE_SHIFT); /* BYPASS s/b 0 already */
153 writel(misc_data, &pll->pll_misc);
154 writel(data, &pll->pll_base);
156 writel(misc_data, &simple_pll->pll_misc);
157 writel(data, &simple_pll->pll_base);
160 /* calculate the stable time */
161 return timer_get_us() + CLOCK_PLL_STABLE_DELAY_US;
164 void clock_ll_set_source_divisor(enum periph_id periph_id, unsigned source,
167 u32 *reg = get_periph_source_reg(periph_id);
172 value &= ~OUT_CLK_SOURCE_31_30_MASK;
173 value |= source << OUT_CLK_SOURCE_31_30_SHIFT;
175 value &= ~OUT_CLK_DIVISOR_MASK;
176 value |= divisor << OUT_CLK_DIVISOR_SHIFT;
181 int clock_ll_set_source_bits(enum periph_id periph_id, int mux_bits,
184 u32 *reg = get_periph_source_reg(periph_id);
187 case MASK_BITS_31_30:
188 clrsetbits_le32(reg, OUT_CLK_SOURCE_31_30_MASK,
189 source << OUT_CLK_SOURCE_31_30_SHIFT);
192 case MASK_BITS_31_29:
193 clrsetbits_le32(reg, OUT_CLK_SOURCE_31_29_MASK,
194 source << OUT_CLK_SOURCE_31_29_SHIFT);
197 case MASK_BITS_31_28:
198 clrsetbits_le32(reg, OUT_CLK_SOURCE_31_28_MASK,
199 source << OUT_CLK_SOURCE_31_28_SHIFT);
209 void clock_ll_set_source(enum periph_id periph_id, unsigned source)
211 clock_ll_set_source_bits(periph_id, MASK_BITS_31_30, source);
215 * Given the parent's rate and the required rate for the children, this works
216 * out the peripheral clock divider to use, in 7.1 binary format.
218 * @param divider_bits number of divider bits (8 or 16)
219 * @param parent_rate clock rate of parent clock in Hz
220 * @param rate required clock rate for this clock
221 * @return divider which should be used
223 static int clk_get_divider(unsigned divider_bits, unsigned long parent_rate,
226 u64 divider = parent_rate * 2;
227 unsigned max_divider = 1 << divider_bits;
230 do_div(divider, rate);
232 if ((s64)divider - 2 < 0)
235 if ((s64)divider - 2 >= max_divider)
241 int clock_set_pllout(enum clock_id clkid, enum pll_out_id pllout, unsigned rate)
243 struct clk_pll *pll = get_pll(clkid);
244 int data = 0, div = 0, offset = 0;
246 if (!clock_id_is_pll(clkid))
249 if (pllout + 1 > pll_num_clkouts[clkid])
252 div = clk_get_divider(8, pll_rate[clkid], rate);
257 /* out2 and out4 are in the high part of the register */
258 if (pllout == PLL_OUT2 || pllout == PLL_OUT4)
261 data = (div << PLL_OUT_RATIO_SHIFT) |
262 PLL_OUT_OVRRIDE | PLL_OUT_CLKEN | PLL_OUT_RSTN;
263 clrsetbits_le32(&pll->pll_out[pllout >> 1],
264 PLL_OUT_RATIO_MASK << offset, data << offset);
270 * Given the parent's rate and the divider in 7.1 format, this works out the
271 * resulting peripheral clock rate.
273 * @param parent_rate clock rate of parent clock in Hz
274 * @param divider which should be used in 7.1 format
275 * @return effective clock rate of peripheral
277 static unsigned long get_rate_from_divider(unsigned long parent_rate,
282 rate = (u64)parent_rate * 2;
283 do_div(rate, divider + 2);
287 unsigned long clock_get_periph_rate(enum periph_id periph_id,
288 enum clock_id parent)
290 u32 *reg = get_periph_source_reg(periph_id);
292 return get_rate_from_divider(pll_rate[parent],
293 (readl(reg) & OUT_CLK_DIVISOR_MASK) >> OUT_CLK_DIVISOR_SHIFT);
297 * Find the best available 7.1 format divisor given a parent clock rate and
298 * required child clock rate. This function assumes that a second-stage
299 * divisor is available which can divide by powers of 2 from 1 to 256.
301 * @param divider_bits number of divider bits (8 or 16)
302 * @param parent_rate clock rate of parent clock in Hz
303 * @param rate required clock rate for this clock
304 * @param extra_div value for the second-stage divisor (not set if this
305 * function returns -1.
306 * @return divider which should be used, or -1 if nothing is valid
309 static int find_best_divider(unsigned divider_bits, unsigned long parent_rate,
310 unsigned long rate, int *extra_div)
313 int best_divider = -1;
314 int best_error = rate;
316 /* try dividers from 1 to 256 and find closest match */
317 for (shift = 0; shift <= 8 && best_error > 0; shift++) {
318 unsigned divided_parent = parent_rate >> shift;
319 int divider = clk_get_divider(divider_bits, divided_parent,
321 unsigned effective_rate = get_rate_from_divider(divided_parent,
323 int error = rate - effective_rate;
325 /* Given a valid divider, look for the lowest error */
326 if (divider != -1 && error < best_error) {
328 *extra_div = 1 << shift;
329 best_divider = divider;
333 /* return what we found - *extra_div will already be set */
338 * Adjust peripheral PLL to use the given divider and source.
340 * @param periph_id peripheral to adjust
341 * @param source Source number (0-3 or 0-7)
342 * @param mux_bits Number of mux bits (2 or 4)
343 * @param divider Required divider in 7.1 or 15.1 format
344 * @return 0 if ok, -1 on error (requesting a parent clock which is not valid
345 * for this peripheral)
347 static int adjust_periph_pll(enum periph_id periph_id, int source,
348 int mux_bits, unsigned divider)
350 u32 *reg = get_periph_source_reg(periph_id);
352 clrsetbits_le32(reg, OUT_CLK_DIVISOR_MASK,
353 divider << OUT_CLK_DIVISOR_SHIFT);
356 /* work out the source clock and set it */
360 clock_ll_set_source_bits(periph_id, mux_bits, source);
366 unsigned clock_adjust_periph_pll_div(enum periph_id periph_id,
367 enum clock_id parent, unsigned rate, int *extra_div)
369 unsigned effective_rate;
370 int mux_bits, divider_bits, source;
374 /* work out the source clock and set it */
375 source = get_periph_clock_source(periph_id, parent, &mux_bits,
378 divider = find_best_divider(divider_bits, pll_rate[parent],
383 assert(divider >= 0);
384 if (adjust_periph_pll(periph_id, source, mux_bits, divider))
386 debug("periph %d, rate=%d, reg=%p = %x\n", periph_id, rate,
387 get_periph_source_reg(periph_id),
388 readl(get_periph_source_reg(periph_id)));
390 /* Check what we ended up with. This shouldn't matter though */
391 effective_rate = clock_get_periph_rate(periph_id, parent);
393 effective_rate /= *extra_div;
394 if (rate != effective_rate)
395 debug("Requested clock rate %u not honored (got %u)\n",
396 rate, effective_rate);
397 return effective_rate;
400 unsigned clock_start_periph_pll(enum periph_id periph_id,
401 enum clock_id parent, unsigned rate)
403 unsigned effective_rate;
405 reset_set_enable(periph_id, 1);
406 clock_enable(periph_id);
408 effective_rate = clock_adjust_periph_pll_div(periph_id, parent, rate,
411 reset_set_enable(periph_id, 0);
412 return effective_rate;
415 void clock_enable(enum periph_id clkid)
417 clock_set_enable(clkid, 1);
420 void clock_disable(enum periph_id clkid)
422 clock_set_enable(clkid, 0);
425 void reset_periph(enum periph_id periph_id, int us_delay)
427 /* Put peripheral into reset */
428 reset_set_enable(periph_id, 1);
432 reset_set_enable(periph_id, 0);
437 void reset_cmplx_set_enable(int cpu, int which, int reset)
439 struct clk_rst_ctlr *clkrst =
440 (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
443 /* Form the mask, which depends on the cpu chosen (2 or 4) */
444 assert(cpu >= 0 && cpu < MAX_NUM_CPU);
447 /* either enable or disable those reset for that CPU */
449 writel(mask, &clkrst->crc_cpu_cmplx_set);
451 writel(mask, &clkrst->crc_cpu_cmplx_clr);
454 unsigned int __weak clk_m_get_rate(unsigned int parent_rate)
459 unsigned clock_get_rate(enum clock_id clkid)
463 u64 parent_rate, rate;
464 struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
466 parent_rate = osc_freq[clock_get_osc_freq()];
467 if (clkid == CLOCK_ID_OSC)
470 if (clkid == CLOCK_ID_CLK_M)
471 return clk_m_get_rate(parent_rate);
473 pll = get_pll(clkid);
476 base = readl(&pll->pll_base);
478 rate = parent_rate * ((base >> pllinfo->n_shift) & pllinfo->n_mask);
479 divm = (base >> pllinfo->m_shift) & pllinfo->m_mask;
481 * PLLU uses p_mask/p_shift for VCO on all but T210,
482 * T210 uses normal DIVP. Handled in pllinfo table.
484 #ifdef CONFIG_TEGRA210
486 * PLLP's primary output (pllP_out0) on T210 is the VCO, and divp is
487 * not applied. pllP_out2 does have divp applied. All other pllP_outN
488 * are divided down from pllP_out0. We only support pllP_out0 in
489 * U-Boot at the time of writing this comment.
491 if (clkid != CLOCK_ID_PERIPH)
493 divm <<= (base >> pllinfo->p_shift) & pllinfo->p_mask;
499 * Set the output frequency you want for each PLL clock.
500 * PLL output frequencies are programmed by setting their N, M and P values.
501 * The governing equations are:
502 * VCO = (Fi / m) * n, Fo = VCO / (2^p)
503 * where Fo is the output frequency from the PLL.
504 * Example: Set the output frequency to 216Mhz(Fo) with 12Mhz OSC(Fi)
505 * 216Mhz = ((12Mhz / m) * n) / (2^p) so n=432,m=12,p=1
506 * Please see Tegra TRM section 5.3 to get the detail for PLL Programming
508 * @param n PLL feedback divider(DIVN)
509 * @param m PLL input divider(DIVN)
510 * @param p post divider(DIVP)
511 * @param cpcon base PLL charge pump(CPCON)
512 * @return 0 if ok, -1 on error (the requested PLL is incorrect and cannot
513 * be overridden), 1 if PLL is already correct
515 int clock_set_rate(enum clock_id clkid, u32 n, u32 m, u32 p, u32 cpcon)
517 u32 base_reg, misc_reg;
519 struct clk_pll_info *pllinfo = &tegra_pll_info_table[clkid];
521 pll = get_pll(clkid);
523 base_reg = readl(&pll->pll_base);
525 /* Set BYPASS, m, n and p to PLL_BASE */
526 base_reg &= ~(pllinfo->m_mask << pllinfo->m_shift);
527 base_reg |= m << pllinfo->m_shift;
529 base_reg &= ~(pllinfo->n_mask << pllinfo->n_shift);
530 base_reg |= n << pllinfo->n_shift;
532 base_reg &= ~(pllinfo->p_mask << pllinfo->p_shift);
533 base_reg |= p << pllinfo->p_shift;
535 if (clkid == CLOCK_ID_PERIPH) {
537 * If the PLL is already set up, check that it is correct
538 * and record this info for clock_verify() to check.
540 if (base_reg & PLL_BASE_OVRRIDE_MASK) {
541 base_reg |= PLL_ENABLE_MASK;
542 if (base_reg != readl(&pll->pll_base))
544 return pllp_valid ? 1 : -1;
546 base_reg |= PLL_BASE_OVRRIDE_MASK;
549 base_reg |= PLL_BYPASS_MASK;
550 writel(base_reg, &pll->pll_base);
552 /* Set cpcon (KCP) to PLL_MISC */
553 misc_reg = readl(&pll->pll_misc);
554 misc_reg &= ~(pllinfo->kcp_mask << pllinfo->kcp_shift);
555 misc_reg |= cpcon << pllinfo->kcp_shift;
556 writel(misc_reg, &pll->pll_misc);
559 base_reg |= PLL_ENABLE_MASK;
560 writel(base_reg, &pll->pll_base);
563 base_reg &= ~PLL_BYPASS_MASK;
564 writel(base_reg, &pll->pll_base);
569 void clock_ll_start_uart(enum periph_id periph_id)
571 /* Assert UART reset and enable clock */
572 reset_set_enable(periph_id, 1);
573 clock_enable(periph_id);
574 clock_ll_set_source(periph_id, 0); /* UARTx_CLK_SRC = 00, PLLP_OUT0 */
579 /* De-assert reset to UART */
580 reset_set_enable(periph_id, 0);
583 #if CONFIG_IS_ENABLED(OF_CONTROL)
584 int clock_decode_periph_id(const void *blob, int node)
590 err = fdtdec_get_int_array(blob, node, "clocks", cell,
594 id = clk_id_to_periph_id(cell[1]);
595 assert(clock_periph_id_isvalid(id));
598 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
600 int clock_verify(void)
602 struct clk_pll *pll = get_pll(CLOCK_ID_PERIPH);
603 u32 reg = readl(&pll->pll_base);
606 printf("Warning: PLLP %x is not correct\n", reg);
609 debug("PLLP %x is correct\n", reg);
613 void clock_init(void)
615 pll_rate[CLOCK_ID_CGENERAL] = clock_get_rate(CLOCK_ID_CGENERAL);
616 pll_rate[CLOCK_ID_MEMORY] = clock_get_rate(CLOCK_ID_MEMORY);
617 pll_rate[CLOCK_ID_PERIPH] = clock_get_rate(CLOCK_ID_PERIPH);
618 pll_rate[CLOCK_ID_USB] = clock_get_rate(CLOCK_ID_USB);
619 pll_rate[CLOCK_ID_DISPLAY] = clock_get_rate(CLOCK_ID_DISPLAY);
620 pll_rate[CLOCK_ID_XCPU] = clock_get_rate(CLOCK_ID_XCPU);
621 pll_rate[CLOCK_ID_SFROM32KHZ] = 32768;
622 pll_rate[CLOCK_ID_OSC] = clock_get_rate(CLOCK_ID_OSC);
623 pll_rate[CLOCK_ID_CLK_M] = clock_get_rate(CLOCK_ID_CLK_M);
625 debug("Osc = %d\n", pll_rate[CLOCK_ID_OSC]);
626 debug("CLKM = %d\n", pll_rate[CLOCK_ID_CLK_M]);
627 debug("PLLC = %d\n", pll_rate[CLOCK_ID_CGENERAL]);
628 debug("PLLM = %d\n", pll_rate[CLOCK_ID_MEMORY]);
629 debug("PLLP = %d\n", pll_rate[CLOCK_ID_PERIPH]);
630 debug("PLLU = %d\n", pll_rate[CLOCK_ID_USB]);
631 debug("PLLD = %d\n", pll_rate[CLOCK_ID_DISPLAY]);
632 debug("PLLX = %d\n", pll_rate[CLOCK_ID_XCPU]);
635 static void set_avp_clock_source(u32 src)
637 struct clk_rst_ctlr *clkrst =
638 (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
641 val = (src << SCLK_SWAKEUP_FIQ_SOURCE_SHIFT) |
642 (src << SCLK_SWAKEUP_IRQ_SOURCE_SHIFT) |
643 (src << SCLK_SWAKEUP_RUN_SOURCE_SHIFT) |
644 (src << SCLK_SWAKEUP_IDLE_SOURCE_SHIFT) |
645 (SCLK_SYS_STATE_RUN << SCLK_SYS_STATE_SHIFT);
646 writel(val, &clkrst->crc_sclk_brst_pol);
651 * This function is useful on Tegra30, and any later SoCs that have compatible
652 * PLLP configuration registers.
653 * NOTE: Not used on Tegra210 - see tegra210_setup_pllp in T210 clock.c
655 void tegra30_set_up_pllp(void)
657 struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
661 * Based on the Tegra TRM, the system clock (which is the AVP clock) can
662 * run up to 275MHz. On power on, the default sytem clock source is set
663 * to PLLP_OUT0. This function sets PLLP's (hence PLLP_OUT0's) rate to
664 * 408MHz which is beyond system clock's upper limit.
666 * The fix is to set the system clock to CLK_M before initializing PLLP,
667 * and then switch back to PLLP_OUT4, which has an appropriate divider
668 * configured, after PLLP has been configured
670 set_avp_clock_source(SCLK_SOURCE_CLKM);
673 * PLLP output frequency set to 408Mhz
674 * PLLC output frequency set to 228Mhz
676 switch (clock_get_osc_freq()) {
677 case CLOCK_OSC_FREQ_12_0: /* OSC is 12Mhz */
678 clock_set_rate(CLOCK_ID_PERIPH, 408, 12, 0, 8);
679 clock_set_rate(CLOCK_ID_CGENERAL, 456, 12, 1, 8);
682 case CLOCK_OSC_FREQ_26_0: /* OSC is 26Mhz */
683 clock_set_rate(CLOCK_ID_PERIPH, 408, 26, 0, 8);
684 clock_set_rate(CLOCK_ID_CGENERAL, 600, 26, 0, 8);
687 case CLOCK_OSC_FREQ_13_0: /* OSC is 13Mhz */
688 clock_set_rate(CLOCK_ID_PERIPH, 408, 13, 0, 8);
689 clock_set_rate(CLOCK_ID_CGENERAL, 600, 13, 0, 8);
691 case CLOCK_OSC_FREQ_19_2:
694 * These are not supported. It is too early to print a
695 * message and the UART likely won't work anyway due to the
696 * oscillator being wrong.
701 /* Set PLLP_OUT1, 2, 3 & 4 freqs to 9.6, 48, 102 & 204MHz */
704 /* Assert RSTN before enable */
705 reg = PLLP_OUT2_RSTN_EN | PLLP_OUT1_RSTN_EN;
706 writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[0]);
707 /* Set divisor and reenable */
708 reg = (IN_408_OUT_48_DIVISOR << PLLP_OUT2_RATIO)
709 | PLLP_OUT2_OVR | PLLP_OUT2_CLKEN | PLLP_OUT2_RSTN_DIS
710 | (IN_408_OUT_9_6_DIVISOR << PLLP_OUT1_RATIO)
711 | PLLP_OUT1_OVR | PLLP_OUT1_CLKEN | PLLP_OUT1_RSTN_DIS;
712 writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[0]);
715 /* Assert RSTN before enable */
716 reg = PLLP_OUT4_RSTN_EN | PLLP_OUT3_RSTN_EN;
717 writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[1]);
718 /* Set divisor and reenable */
719 reg = (IN_408_OUT_204_DIVISOR << PLLP_OUT4_RATIO)
720 | PLLP_OUT4_OVR | PLLP_OUT4_CLKEN | PLLP_OUT4_RSTN_DIS
721 | (IN_408_OUT_102_DIVISOR << PLLP_OUT3_RATIO)
722 | PLLP_OUT3_OVR | PLLP_OUT3_CLKEN | PLLP_OUT3_RSTN_DIS;
723 writel(reg, &clkrst->crc_pll[CLOCK_ID_PERIPH].pll_out[1]);
725 set_avp_clock_source(SCLK_SOURCE_PLLP_OUT4);
728 int clock_external_output(int clk_id)
730 struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
732 if (clk_id >= 1 && clk_id <= 3) {
733 setbits_le32(&pmc->pmc_clk_out_cntrl,
734 1 << (2 + (clk_id - 1) * 8));
736 printf("%s: Unknown output clock id %d\n", __func__, clk_id);