2 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #include <linux/clk-provider.h>
21 #include <linux/clkdev.h>
24 * struct tegra_clk_sync_source - external clock source from codec
26 * @hw: handle between common and hardware-specific interfaces
27 * @rate: input frequency from source
28 * @max_rate: max rate allowed
30 struct tegra_clk_sync_source {
33 unsigned long max_rate;
36 #define to_clk_sync_source(_hw) \
37 container_of(_hw, struct tegra_clk_sync_source, hw)
39 extern const struct clk_ops tegra_clk_sync_source_ops;
40 extern int *periph_clk_enb_refcnt;
42 struct clk *tegra_clk_register_sync_source(const char *name,
43 unsigned long fixed_rate, unsigned long max_rate);
46 * struct tegra_clk_frac_div - fractional divider clock
48 * @hw: handle between common and hardware-specific interfaces
49 * @reg: register containing divider
50 * @flags: hardware-specific flags
51 * @shift: shift to the divider bit field
52 * @width: width of the divider bit field
53 * @frac_width: width of the fractional bit field
54 * @lock: register lock
57 * TEGRA_DIVIDER_ROUND_UP - This flags indicates to round up the divider value.
58 * TEGRA_DIVIDER_FIXED - Fixed rate PLL dividers has addition override bit, this
59 * flag indicates that this divider is for fixed rate PLL.
60 * TEGRA_DIVIDER_INT - Some modules can not cope with the duty cycle when
61 * fraction bit is set. This flags indicates to calculate divider for which
62 * fracton bit will be zero.
63 * TEGRA_DIVIDER_UART - UART module divider has additional enable bit which is
64 * set when divider value is not 0. This flags indicates that the divider
67 struct tegra_clk_frac_div {
77 #define to_clk_frac_div(_hw) container_of(_hw, struct tegra_clk_frac_div, hw)
79 #define TEGRA_DIVIDER_ROUND_UP BIT(0)
80 #define TEGRA_DIVIDER_FIXED BIT(1)
81 #define TEGRA_DIVIDER_INT BIT(2)
82 #define TEGRA_DIVIDER_UART BIT(3)
84 extern const struct clk_ops tegra_clk_frac_div_ops;
85 struct clk *tegra_clk_register_divider(const char *name,
86 const char *parent_name, void __iomem *reg,
87 unsigned long flags, u8 clk_divider_flags, u8 shift, u8 width,
88 u8 frac_width, spinlock_t *lock);
89 struct clk *tegra_clk_register_mc(const char *name, const char *parent_name,
90 void __iomem *reg, spinlock_t *lock);
95 * In general, there are 3 requirements for each PLL
96 * that SW needs to be comply with.
97 * (1) Input frequency range (REF).
98 * (2) Comparison frequency range (CF). CF = REF/DIVM.
99 * (3) VCO frequency range (VCO). VCO = CF * DIVN.
101 * The final PLL output frequency (FO) = VCO >> DIVP.
105 * struct tegra_clk_pll_freq_table - PLL frequecy table
107 * @input_rate: input rate from source
108 * @output_rate: output rate from PLL for the input rate
109 * @n: feedback divider
112 * @cpcon: charge pump current
113 * @sdm_data: fraction divider setting (0 = disabled)
115 struct tegra_clk_pll_freq_table {
116 unsigned long input_rate;
117 unsigned long output_rate;
126 * struct pdiv_map - map post divider to hw value
128 * @pdiv: post divider
129 * @hw_val: value to be written to the PLL hw
137 * struct div_nmp - offset and width of m,n and p fields
139 * @divn_shift: shift to the feedback divider bit field
140 * @divn_width: width of the feedback divider bit field
141 * @divm_shift: shift to the input divider bit field
142 * @divm_width: width of the input divider bit field
143 * @divp_shift: shift to the post divider bit field
144 * @divp_width: width of the post divider bit field
145 * @override_divn_shift: shift to the feedback divider bitfield in override reg
146 * @override_divm_shift: shift to the input divider bitfield in override reg
147 * @override_divp_shift: shift to the post divider bitfield in override reg
156 u8 override_divn_shift;
157 u8 override_divm_shift;
158 u8 override_divp_shift;
161 #define MAX_PLL_MISC_REG_COUNT 6
164 * struct tegra_clk_pll_params - PLL parameters
166 * @input_min: Minimum input frequency
167 * @input_max: Maximum input frequency
168 * @cf_min: Minimum comparison frequency
169 * @cf_max: Maximum comparison frequency
170 * @vco_min: Minimum VCO frequency
171 * @vco_max: Maximum VCO frequency
172 * @base_reg: PLL base reg offset
173 * @misc_reg: PLL misc reg offset
174 * @lock_reg: PLL lock reg offset
175 * @lock_mask: Bitmask for PLL lock status
176 * @lock_enable_bit_idx: Bit index to enable PLL lock
177 * @iddq_reg: PLL IDDQ register offset
178 * @iddq_bit_idx: Bit index to enable PLL IDDQ
179 * @reset_reg: Register offset of where RESET bit is
180 * @reset_bit_idx: Shift of reset bit in reset_reg
181 * @sdm_din_reg: Register offset where SDM settings are
182 * @sdm_din_mask: Mask of SDM divider bits
183 * @sdm_ctrl_reg: Register offset where SDM enable is
184 * @sdm_ctrl_en_mask: Mask of SDM enable bit
185 * @aux_reg: AUX register offset
186 * @dyn_ramp_reg: Dynamic ramp control register offset
187 * @ext_misc_reg: Miscellaneous control register offsets
188 * @pmc_divnm_reg: n, m divider PMC override register offset (PLLM)
189 * @pmc_divp_reg: p divider PMC override register offset (PLLM)
191 * @stepa_shift: Dynamic ramp step A field shift
192 * @stepb_shift: Dynamic ramp step B field shift
193 * @lock_delay: Delay in us if PLL lock is not used
194 * @max_p: maximum value for the p divider
195 * @pdiv_tohw: mapping of p divider to register values
196 * @div_nmp: offsets and widths on n, m and p fields
197 * @freq_table: array of frequencies supported by PLL
198 * @fixed_rate: PLL rate if it is fixed
199 * @mdiv_default: Default value for fixed mdiv for this PLL
200 * @round_p_to_pdiv: Callback used to round p to the closed pdiv
201 * @set_gain: Callback to adjust N div for SDM enabled
202 * PLL's based on fractional divider value.
203 * @calc_rate: Callback used to change how out of table
204 * rates (dividers and multipler) are calculated.
207 * TEGRA_PLL_USE_LOCK - This flag indicated to use lock bits for
208 * PLL locking. If not set it will use lock_delay value to wait.
209 * TEGRA_PLL_HAS_CPCON - This flag indicates that CPCON value needs
210 * to be programmed to change output frequency of the PLL.
211 * TEGRA_PLL_SET_LFCON - This flag indicates that LFCON value needs
212 * to be programmed to change output frequency of the PLL.
213 * TEGRA_PLL_SET_DCCON - This flag indicates that DCCON value needs
214 * to be programmed to change output frequency of the PLL.
215 * TEGRA_PLLU - PLLU has inverted post divider. This flags indicated
216 * that it is PLLU and invert post divider value.
217 * TEGRA_PLLM - PLLM has additional override settings in PMC. This
218 * flag indicates that it is PLLM and use override settings.
219 * TEGRA_PLL_FIXED - We are not supposed to change output frequency
221 * TEGRA_PLLE_CONFIGURE - Configure PLLE when enabling.
222 * TEGRA_PLL_LOCK_MISC - Lock bit is in the misc register instead of the
224 * TEGRA_PLL_BYPASS - PLL has bypass bit
225 * TEGRA_PLL_HAS_LOCK_ENABLE - PLL has bit to enable lock monitoring
226 * TEGRA_MDIV_NEW - Switch to new method for calculating fixed mdiv
227 * it may be more accurate (especially if SDM present)
228 * TEGRA_PLLMB - PLLMB has should be treated similar to PLLM. This
229 * flag indicated that it is PLLMB.
231 struct tegra_clk_pll_params {
232 unsigned long input_min;
233 unsigned long input_max;
234 unsigned long cf_min;
235 unsigned long cf_max;
236 unsigned long vco_min;
237 unsigned long vco_max;
243 u32 lock_enable_bit_idx;
251 u32 sdm_ctrl_en_mask;
254 u32 ext_misc_reg[MAX_PLL_MISC_REG_COUNT];
262 const struct pdiv_map *pdiv_tohw;
263 struct div_nmp *div_nmp;
264 struct tegra_clk_pll_freq_table *freq_table;
265 unsigned long fixed_rate;
267 u32 (*round_p_to_pdiv)(u32 p, u32 *pdiv);
268 void (*set_gain)(struct tegra_clk_pll_freq_table *cfg);
269 int (*calc_rate)(struct clk_hw *hw,
270 struct tegra_clk_pll_freq_table *cfg,
271 unsigned long rate, unsigned long parent_rate);
274 #define TEGRA_PLL_USE_LOCK BIT(0)
275 #define TEGRA_PLL_HAS_CPCON BIT(1)
276 #define TEGRA_PLL_SET_LFCON BIT(2)
277 #define TEGRA_PLL_SET_DCCON BIT(3)
278 #define TEGRA_PLLU BIT(4)
279 #define TEGRA_PLLM BIT(5)
280 #define TEGRA_PLL_FIXED BIT(6)
281 #define TEGRA_PLLE_CONFIGURE BIT(7)
282 #define TEGRA_PLL_LOCK_MISC BIT(8)
283 #define TEGRA_PLL_BYPASS BIT(9)
284 #define TEGRA_PLL_HAS_LOCK_ENABLE BIT(10)
285 #define TEGRA_MDIV_NEW BIT(11)
286 #define TEGRA_PLLMB BIT(12)
289 * struct tegra_clk_pll - Tegra PLL clock
291 * @hw: handle between common and hardware-specifix interfaces
292 * @clk_base: address of CAR controller
293 * @pmc: address of PMC, required to read override bits
294 * @lock: register lock
295 * @params: PLL parameters
297 struct tegra_clk_pll {
299 void __iomem *clk_base;
302 struct tegra_clk_pll_params *params;
305 #define to_clk_pll(_hw) container_of(_hw, struct tegra_clk_pll, hw)
308 * struct tegra_audio_clk_info - Tegra Audio Clk Information
310 * @name: name for the audio pll
311 * @pll_params: pll_params for audio pll
312 * @clk_id: clk_ids for the audio pll
313 * @parent: name of the parent of the audio pll
315 struct tegra_audio_clk_info {
317 struct tegra_clk_pll_params *pll_params;
322 extern const struct clk_ops tegra_clk_pll_ops;
323 extern const struct clk_ops tegra_clk_plle_ops;
324 struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
325 void __iomem *clk_base, void __iomem *pmc,
326 unsigned long flags, struct tegra_clk_pll_params *pll_params,
329 struct clk *tegra_clk_register_plle(const char *name, const char *parent_name,
330 void __iomem *clk_base, void __iomem *pmc,
331 unsigned long flags, struct tegra_clk_pll_params *pll_params,
334 struct clk *tegra_clk_register_pllxc(const char *name, const char *parent_name,
335 void __iomem *clk_base, void __iomem *pmc,
337 struct tegra_clk_pll_params *pll_params,
340 struct clk *tegra_clk_register_pllxc_tegra210(const char *name,
341 const char *parent_name, void __iomem *clk_base,
342 void __iomem *pmc, unsigned long flags,
343 struct tegra_clk_pll_params *pll_params,
346 struct clk *tegra_clk_register_pllm(const char *name, const char *parent_name,
347 void __iomem *clk_base, void __iomem *pmc,
349 struct tegra_clk_pll_params *pll_params,
352 struct clk *tegra_clk_register_pllc(const char *name, const char *parent_name,
353 void __iomem *clk_base, void __iomem *pmc,
355 struct tegra_clk_pll_params *pll_params,
358 struct clk *tegra_clk_register_pllre(const char *name, const char *parent_name,
359 void __iomem *clk_base, void __iomem *pmc,
361 struct tegra_clk_pll_params *pll_params,
362 spinlock_t *lock, unsigned long parent_rate);
364 struct clk *tegra_clk_register_plle_tegra114(const char *name,
365 const char *parent_name,
366 void __iomem *clk_base, unsigned long flags,
367 struct tegra_clk_pll_params *pll_params,
370 struct clk *tegra_clk_register_plle_tegra210(const char *name,
371 const char *parent_name,
372 void __iomem *clk_base, unsigned long flags,
373 struct tegra_clk_pll_params *pll_params,
376 struct clk *tegra_clk_register_pllc_tegra210(const char *name,
377 const char *parent_name, void __iomem *clk_base,
378 void __iomem *pmc, unsigned long flags,
379 struct tegra_clk_pll_params *pll_params,
382 struct clk *tegra_clk_register_pllss_tegra210(const char *name,
383 const char *parent_name, void __iomem *clk_base,
385 struct tegra_clk_pll_params *pll_params,
388 struct clk *tegra_clk_register_pllss(const char *name, const char *parent_name,
389 void __iomem *clk_base, unsigned long flags,
390 struct tegra_clk_pll_params *pll_params,
393 struct clk *tegra_clk_register_pllmb(const char *name, const char *parent_name,
394 void __iomem *clk_base, void __iomem *pmc,
396 struct tegra_clk_pll_params *pll_params,
400 * struct tegra_clk_pll_out - PLL divider down clock
402 * @hw: handle between common and hardware-specific interfaces
403 * @reg: register containing the PLL divider
404 * @enb_bit_idx: bit to enable/disable PLL divider
405 * @rst_bit_idx: bit to reset PLL divider
406 * @lock: register lock
407 * @flags: hardware-specific flags
409 struct tegra_clk_pll_out {
418 #define to_clk_pll_out(_hw) container_of(_hw, struct tegra_clk_pll_out, hw)
420 extern const struct clk_ops tegra_clk_pll_out_ops;
421 struct clk *tegra_clk_register_pll_out(const char *name,
422 const char *parent_name, void __iomem *reg, u8 enb_bit_idx,
423 u8 rst_bit_idx, unsigned long flags, u8 pll_div_flags,
427 * struct tegra_clk_periph_regs - Registers controlling peripheral clock
429 * @enb_reg: read the enable status
430 * @enb_set_reg: write 1 to enable clock
431 * @enb_clr_reg: write 1 to disable clock
432 * @rst_reg: read the reset status
433 * @rst_set_reg: write 1 to assert the reset of peripheral
434 * @rst_clr_reg: write 1 to deassert the reset of peripheral
436 struct tegra_clk_periph_regs {
446 * struct tegra_clk_periph_gate - peripheral gate clock
448 * @magic: magic number to validate type
449 * @hw: handle between common and hardware-specific interfaces
450 * @clk_base: address of CAR controller
451 * @regs: Registers to control the peripheral
452 * @flags: hardware-specific flags
453 * @clk_num: Clock number
454 * @enable_refcnt: array to maintain reference count of the clock
457 * TEGRA_PERIPH_NO_RESET - This flag indicates that reset is not allowed
459 * TEGRA_PERIPH_MANUAL_RESET - This flag indicates not to reset module
460 * after clock enable and driver for the module is responsible for
462 * TEGRA_PERIPH_ON_APB - If peripheral is in the APB bus then read the
463 * bus to flush the write operation in apb bus. This flag indicates
464 * that this peripheral is in apb bus.
465 * TEGRA_PERIPH_WAR_1005168 - Apply workaround for Tegra114 MSENC bug
467 struct tegra_clk_periph_gate {
470 void __iomem *clk_base;
474 struct tegra_clk_periph_regs *regs;
477 #define to_clk_periph_gate(_hw) \
478 container_of(_hw, struct tegra_clk_periph_gate, hw)
480 #define TEGRA_CLK_PERIPH_GATE_MAGIC 0x17760309
482 #define TEGRA_PERIPH_NO_RESET BIT(0)
483 #define TEGRA_PERIPH_MANUAL_RESET BIT(1)
484 #define TEGRA_PERIPH_ON_APB BIT(2)
485 #define TEGRA_PERIPH_WAR_1005168 BIT(3)
486 #define TEGRA_PERIPH_NO_DIV BIT(4)
487 #define TEGRA_PERIPH_NO_GATE BIT(5)
489 extern const struct clk_ops tegra_clk_periph_gate_ops;
490 struct clk *tegra_clk_register_periph_gate(const char *name,
491 const char *parent_name, u8 gate_flags, void __iomem *clk_base,
492 unsigned long flags, int clk_num, int *enable_refcnt);
495 * struct clk-periph - peripheral clock
497 * @magic: magic number to validate type
498 * @hw: handle between common and hardware-specific interfaces
500 * @divider: divider clock
502 * @mux_ops: mux clock ops
503 * @div_ops: divider clock ops
504 * @gate_ops: gate clock ops
506 struct tegra_clk_periph {
510 struct tegra_clk_frac_div divider;
511 struct tegra_clk_periph_gate gate;
513 const struct clk_ops *mux_ops;
514 const struct clk_ops *div_ops;
515 const struct clk_ops *gate_ops;
518 #define to_clk_periph(_hw) container_of(_hw, struct tegra_clk_periph, hw)
520 #define TEGRA_CLK_PERIPH_MAGIC 0x18221223
522 extern const struct clk_ops tegra_clk_periph_ops;
523 struct clk *tegra_clk_register_periph(const char *name,
524 const char **parent_names, int num_parents,
525 struct tegra_clk_periph *periph, void __iomem *clk_base,
526 u32 offset, unsigned long flags);
527 struct clk *tegra_clk_register_periph_nodiv(const char *name,
528 const char **parent_names, int num_parents,
529 struct tegra_clk_periph *periph, void __iomem *clk_base,
532 #define TEGRA_CLK_PERIPH(_mux_shift, _mux_mask, _mux_flags, \
533 _div_shift, _div_width, _div_frac_width, \
534 _div_flags, _clk_num,\
535 _gate_flags, _table, _lock) \
538 .flags = _mux_flags, \
539 .shift = _mux_shift, \
545 .flags = _div_flags, \
546 .shift = _div_shift, \
547 .width = _div_width, \
548 .frac_width = _div_frac_width, \
552 .flags = _gate_flags, \
553 .clk_num = _clk_num, \
555 .mux_ops = &clk_mux_ops, \
556 .div_ops = &tegra_clk_frac_div_ops, \
557 .gate_ops = &tegra_clk_periph_gate_ops, \
560 struct tegra_periph_init_data {
564 const char **parent_names;
565 const char *parent_name;
568 struct tegra_clk_periph periph;
575 #define TEGRA_INIT_DATA_TABLE(_name, _con_id, _dev_id, _parent_names, _offset,\
576 _mux_shift, _mux_mask, _mux_flags, _div_shift, \
577 _div_width, _div_frac_width, _div_flags, \
578 _clk_num, _gate_flags, _clk_id, _table, \
583 .p.parent_names = _parent_names, \
584 .num_parents = ARRAY_SIZE(_parent_names), \
585 .periph = TEGRA_CLK_PERIPH(_mux_shift, _mux_mask, \
586 _mux_flags, _div_shift, \
587 _div_width, _div_frac_width, \
588 _div_flags, _clk_num, \
589 _gate_flags, _table, _lock), \
596 #define TEGRA_INIT_DATA(_name, _con_id, _dev_id, _parent_names, _offset,\
597 _mux_shift, _mux_width, _mux_flags, _div_shift, \
598 _div_width, _div_frac_width, _div_flags, \
599 _clk_num, _gate_flags, _clk_id) \
600 TEGRA_INIT_DATA_TABLE(_name, _con_id, _dev_id, _parent_names, _offset,\
601 _mux_shift, BIT(_mux_width) - 1, _mux_flags, \
602 _div_shift, _div_width, _div_frac_width, _div_flags, \
603 _clk_num, _gate_flags, _clk_id,\
607 * struct clk_super_mux - super clock
609 * @hw: handle between common and hardware-specific interfaces
610 * @reg: register controlling multiplexer
611 * @width: width of the multiplexer bit field
612 * @flags: hardware-specific flags
613 * @div2_index: bit controlling divide-by-2
614 * @pllx_index: PLLX index in the parent list
615 * @lock: register lock
618 * TEGRA_DIVIDER_2 - LP cluster has additional divider. This flag indicates
619 * that this is LP cluster clock.
621 struct tegra_clk_super_mux {
631 #define to_clk_super_mux(_hw) container_of(_hw, struct tegra_clk_super_mux, hw)
633 #define TEGRA_DIVIDER_2 BIT(0)
635 extern const struct clk_ops tegra_clk_super_ops;
636 struct clk *tegra_clk_register_super_mux(const char *name,
637 const char **parent_names, u8 num_parents,
638 unsigned long flags, void __iomem *reg, u8 clk_super_flags,
639 u8 width, u8 pllx_index, u8 div2_index, spinlock_t *lock);
642 * struct clk_init_table - clock initialization table
643 * @clk_id: clock id as mentioned in device tree bindings
644 * @parent_id: parent clock id as mentioned in device tree bindings
646 * @state: enable/disable
648 struct tegra_clk_init_table {
650 unsigned int parent_id;
656 * struct clk_duplicate - duplicate clocks
657 * @clk_id: clock id as mentioned in device tree bindings
658 * @lookup: duplicate lookup entry for the clock
660 struct tegra_clk_duplicate {
662 struct clk_lookup lookup;
665 #define TEGRA_CLK_DUPLICATE(_clk_id, _dev, _con) \
679 struct tegra_devclk {
685 void tegra_init_special_resets(unsigned int num, int (*assert)(unsigned long),
686 int (*deassert)(unsigned long));
688 void tegra_init_from_table(struct tegra_clk_init_table *tbl,
689 struct clk *clks[], int clk_max);
691 void tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list,
692 struct clk *clks[], int clk_max);
694 struct tegra_clk_periph_regs *get_reg_bank(int clkid);
695 struct clk **tegra_clk_init(void __iomem *clk_base, int num, int periph_banks);
697 struct clk **tegra_lookup_dt_id(int clk_id, struct tegra_clk *tegra_clk);
699 void tegra_add_of_provider(struct device_node *np);
700 void tegra_register_devclks(struct tegra_devclk *dev_clks, int num);
702 void tegra_audio_clk_init(void __iomem *clk_base,
703 void __iomem *pmc_base, struct tegra_clk *tegra_clks,
704 struct tegra_audio_clk_info *audio_info,
705 unsigned int num_plls);
707 void tegra_periph_clk_init(void __iomem *clk_base, void __iomem *pmc_base,
708 struct tegra_clk *tegra_clks,
709 struct tegra_clk_pll_params *pll_params);
711 void tegra_pmc_clk_init(void __iomem *pmc_base, struct tegra_clk *tegra_clks);
712 void tegra_fixed_clk_init(struct tegra_clk *tegra_clks);
713 int tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks,
714 unsigned long *input_freqs, unsigned int num,
715 unsigned int clk_m_div, unsigned long *osc_freq,
716 unsigned long *pll_ref_freq);
717 void tegra_super_clk_gen4_init(void __iomem *clk_base,
718 void __iomem *pmc_base, struct tegra_clk *tegra_clks,
719 struct tegra_clk_pll_params *pll_params);
721 #ifdef CONFIG_TEGRA_CLK_EMC
722 struct clk *tegra_clk_register_emc(void __iomem *base, struct device_node *np,
725 static inline struct clk *tegra_clk_register_emc(void __iomem *base,
726 struct device_node *np,
733 void tegra114_clock_tune_cpu_trimmers_high(void);
734 void tegra114_clock_tune_cpu_trimmers_low(void);
735 void tegra114_clock_tune_cpu_trimmers_init(void);
736 void tegra114_clock_assert_dfll_dvco_reset(void);
737 void tegra114_clock_deassert_dfll_dvco_reset(void);
739 typedef void (*tegra_clk_apply_init_table_func)(void);
740 extern tegra_clk_apply_init_table_func tegra_clk_apply_init_table;
741 int tegra_pll_wait_for_lock(struct tegra_clk_pll *pll);
742 u16 tegra_pll_get_fixed_mdiv(struct clk_hw *hw, unsigned long input_rate);
744 #endif /* TEGRA_CLK_H */