xref: /openbmc/linux/drivers/iio/adc/stm32-dfsdm.h (revision bfcae956)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * This file is part of STM32 DFSDM driver
4  *
5  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
6  * Author(s): Arnaud Pouliquen <arnaud.pouliquen@st.com>.
7  */
8 
9 #ifndef MDF_STM32_DFSDM__H
10 #define MDF_STM32_DFSDM__H
11 
12 #include <linux/bitfield.h>
13 
14 /*
15  * STM32 DFSDM - global register map
16  * __________________________________________________________
17  * | Offset    |             Registers block                |
18  * ----------------------------------------------------------
19  * | 0x000     |      CHANNEL 0 + COMMON CHANNEL FIELDS     |
20  * ----------------------------------------------------------
21  * | 0x020     |                CHANNEL 1                   |
22  * ----------------------------------------------------------
23  * | ...       |                 .....                      |
24  * ----------------------------------------------------------
25  * | 0x20 x n  |                CHANNEL n                   |
26  * ----------------------------------------------------------
27  * | 0x100     |      FILTER  0 + COMMON FILTER FIELDs      |
28  * ----------------------------------------------------------
29  * | 0x200     |                FILTER  1                   |
30  * ----------------------------------------------------------
31  * |           |                 .....                      |
32  * ----------------------------------------------------------
33  * | 0x100 x m |                FILTER  m                   |
34  * ----------------------------------------------------------
35  * |           |                 .....                      |
36  * ----------------------------------------------------------
37  * | 0x7F0-7FC |         Identification registers           |
38  * ----------------------------------------------------------
39  */
40 
41 /*
42  * Channels register definitions
43  */
44 #define DFSDM_CHCFGR1(y)  ((y) * 0x20 + 0x00)
45 #define DFSDM_CHCFGR2(y)  ((y) * 0x20 + 0x04)
46 #define DFSDM_AWSCDR(y)   ((y) * 0x20 + 0x08)
47 #define DFSDM_CHWDATR(y)  ((y) * 0x20 + 0x0C)
48 #define DFSDM_CHDATINR(y) ((y) * 0x20 + 0x10)
49 
50 /* CHCFGR1: Channel configuration register 1 */
51 #define DFSDM_CHCFGR1_SITP_MASK     GENMASK(1, 0)
52 #define DFSDM_CHCFGR1_SITP(v)       FIELD_PREP(DFSDM_CHCFGR1_SITP_MASK, v)
53 #define DFSDM_CHCFGR1_SPICKSEL_MASK GENMASK(3, 2)
54 #define DFSDM_CHCFGR1_SPICKSEL(v)   FIELD_PREP(DFSDM_CHCFGR1_SPICKSEL_MASK, v)
55 #define DFSDM_CHCFGR1_SCDEN_MASK    BIT(5)
56 #define DFSDM_CHCFGR1_SCDEN(v)      FIELD_PREP(DFSDM_CHCFGR1_SCDEN_MASK, v)
57 #define DFSDM_CHCFGR1_CKABEN_MASK   BIT(6)
58 #define DFSDM_CHCFGR1_CKABEN(v)     FIELD_PREP(DFSDM_CHCFGR1_CKABEN_MASK, v)
59 #define DFSDM_CHCFGR1_CHEN_MASK     BIT(7)
60 #define DFSDM_CHCFGR1_CHEN(v)       FIELD_PREP(DFSDM_CHCFGR1_CHEN_MASK, v)
61 #define DFSDM_CHCFGR1_CHINSEL_MASK  BIT(8)
62 #define DFSDM_CHCFGR1_CHINSEL(v)    FIELD_PREP(DFSDM_CHCFGR1_CHINSEL_MASK, v)
63 #define DFSDM_CHCFGR1_DATMPX_MASK   GENMASK(13, 12)
64 #define DFSDM_CHCFGR1_DATMPX(v)     FIELD_PREP(DFSDM_CHCFGR1_DATMPX_MASK, v)
65 #define DFSDM_CHCFGR1_DATPACK_MASK  GENMASK(15, 14)
66 #define DFSDM_CHCFGR1_DATPACK(v)    FIELD_PREP(DFSDM_CHCFGR1_DATPACK_MASK, v)
67 #define DFSDM_CHCFGR1_CKOUTDIV_MASK GENMASK(23, 16)
68 #define DFSDM_CHCFGR1_CKOUTDIV(v)   FIELD_PREP(DFSDM_CHCFGR1_CKOUTDIV_MASK, v)
69 #define DFSDM_CHCFGR1_CKOUTSRC_MASK BIT(30)
70 #define DFSDM_CHCFGR1_CKOUTSRC(v)   FIELD_PREP(DFSDM_CHCFGR1_CKOUTSRC_MASK, v)
71 #define DFSDM_CHCFGR1_DFSDMEN_MASK  BIT(31)
72 #define DFSDM_CHCFGR1_DFSDMEN(v)    FIELD_PREP(DFSDM_CHCFGR1_DFSDMEN_MASK, v)
73 
74 /* CHCFGR2: Channel configuration register 2 */
75 #define DFSDM_CHCFGR2_DTRBS_MASK    GENMASK(7, 3)
76 #define DFSDM_CHCFGR2_DTRBS(v)      FIELD_PREP(DFSDM_CHCFGR2_DTRBS_MASK, v)
77 #define DFSDM_CHCFGR2_OFFSET_MASK   GENMASK(31, 8)
78 #define DFSDM_CHCFGR2_OFFSET(v)     FIELD_PREP(DFSDM_CHCFGR2_OFFSET_MASK, v)
79 
80 /* AWSCDR: Channel analog watchdog and short circuit detector */
81 #define DFSDM_AWSCDR_SCDT_MASK    GENMASK(7, 0)
82 #define DFSDM_AWSCDR_SCDT(v)      FIELD_PREP(DFSDM_AWSCDR_SCDT_MASK, v)
83 #define DFSDM_AWSCDR_BKSCD_MASK   GENMASK(15, 12)
84 #define DFSDM_AWSCDR_BKSCD(v)	  FIELD_PREP(DFSDM_AWSCDR_BKSCD_MASK, v)
85 #define DFSDM_AWSCDR_AWFOSR_MASK  GENMASK(20, 16)
86 #define DFSDM_AWSCDR_AWFOSR(v)    FIELD_PREP(DFSDM_AWSCDR_AWFOSR_MASK, v)
87 #define DFSDM_AWSCDR_AWFORD_MASK  GENMASK(23, 22)
88 #define DFSDM_AWSCDR_AWFORD(v)    FIELD_PREP(DFSDM_AWSCDR_AWFORD_MASK, v)
89 
90 /*
91  * Filters register definitions
92  */
93 #define DFSDM_FILTER_BASE_ADR		0x100
94 #define DFSDM_FILTER_REG_MASK		0x7F
95 #define DFSDM_FILTER_X_BASE_ADR(x)	((x) * 0x80 + DFSDM_FILTER_BASE_ADR)
96 
97 #define DFSDM_CR1(x)     (DFSDM_FILTER_X_BASE_ADR(x)  + 0x00)
98 #define DFSDM_CR2(x)     (DFSDM_FILTER_X_BASE_ADR(x)  + 0x04)
99 #define DFSDM_ISR(x)     (DFSDM_FILTER_X_BASE_ADR(x)  + 0x08)
100 #define DFSDM_ICR(x)     (DFSDM_FILTER_X_BASE_ADR(x)  + 0x0C)
101 #define DFSDM_JCHGR(x)   (DFSDM_FILTER_X_BASE_ADR(x)  + 0x10)
102 #define DFSDM_FCR(x)     (DFSDM_FILTER_X_BASE_ADR(x)  + 0x14)
103 #define DFSDM_JDATAR(x)  (DFSDM_FILTER_X_BASE_ADR(x)  + 0x18)
104 #define DFSDM_RDATAR(x)  (DFSDM_FILTER_X_BASE_ADR(x)  + 0x1C)
105 #define DFSDM_AWHTR(x)   (DFSDM_FILTER_X_BASE_ADR(x)  + 0x20)
106 #define DFSDM_AWLTR(x)   (DFSDM_FILTER_X_BASE_ADR(x)  + 0x24)
107 #define DFSDM_AWSR(x)    (DFSDM_FILTER_X_BASE_ADR(x)  + 0x28)
108 #define DFSDM_AWCFR(x)   (DFSDM_FILTER_X_BASE_ADR(x)  + 0x2C)
109 #define DFSDM_EXMAX(x)   (DFSDM_FILTER_X_BASE_ADR(x)  + 0x30)
110 #define DFSDM_EXMIN(x)   (DFSDM_FILTER_X_BASE_ADR(x)  + 0x34)
111 #define DFSDM_CNVTIMR(x) (DFSDM_FILTER_X_BASE_ADR(x)  + 0x38)
112 
113 /* CR1 Control register 1 */
114 #define DFSDM_CR1_DFEN_MASK	BIT(0)
115 #define DFSDM_CR1_DFEN(v)	FIELD_PREP(DFSDM_CR1_DFEN_MASK, v)
116 #define DFSDM_CR1_JSWSTART_MASK	BIT(1)
117 #define DFSDM_CR1_JSWSTART(v)	FIELD_PREP(DFSDM_CR1_JSWSTART_MASK, v)
118 #define DFSDM_CR1_JSYNC_MASK	BIT(3)
119 #define DFSDM_CR1_JSYNC(v)	FIELD_PREP(DFSDM_CR1_JSYNC_MASK, v)
120 #define DFSDM_CR1_JSCAN_MASK	BIT(4)
121 #define DFSDM_CR1_JSCAN(v)	FIELD_PREP(DFSDM_CR1_JSCAN_MASK, v)
122 #define DFSDM_CR1_JDMAEN_MASK	BIT(5)
123 #define DFSDM_CR1_JDMAEN(v)	FIELD_PREP(DFSDM_CR1_JDMAEN_MASK, v)
124 #define DFSDM_CR1_JEXTSEL_MASK	GENMASK(12, 8)
125 #define DFSDM_CR1_JEXTSEL(v)	FIELD_PREP(DFSDM_CR1_JEXTSEL_MASK, v)
126 #define DFSDM_CR1_JEXTEN_MASK	GENMASK(14, 13)
127 #define DFSDM_CR1_JEXTEN(v)	FIELD_PREP(DFSDM_CR1_JEXTEN_MASK, v)
128 #define DFSDM_CR1_RSWSTART_MASK	BIT(17)
129 #define DFSDM_CR1_RSWSTART(v)	FIELD_PREP(DFSDM_CR1_RSWSTART_MASK, v)
130 #define DFSDM_CR1_RCONT_MASK	BIT(18)
131 #define DFSDM_CR1_RCONT(v)	FIELD_PREP(DFSDM_CR1_RCONT_MASK, v)
132 #define DFSDM_CR1_RSYNC_MASK	BIT(19)
133 #define DFSDM_CR1_RSYNC(v)	FIELD_PREP(DFSDM_CR1_RSYNC_MASK, v)
134 #define DFSDM_CR1_RDMAEN_MASK	BIT(21)
135 #define DFSDM_CR1_RDMAEN(v)	FIELD_PREP(DFSDM_CR1_RDMAEN_MASK, v)
136 #define DFSDM_CR1_RCH_MASK	GENMASK(26, 24)
137 #define DFSDM_CR1_RCH(v)	FIELD_PREP(DFSDM_CR1_RCH_MASK, v)
138 #define DFSDM_CR1_FAST_MASK	BIT(29)
139 #define DFSDM_CR1_FAST(v)	FIELD_PREP(DFSDM_CR1_FAST_MASK, v)
140 #define DFSDM_CR1_AWFSEL_MASK	BIT(30)
141 #define DFSDM_CR1_AWFSEL(v)	FIELD_PREP(DFSDM_CR1_AWFSEL_MASK, v)
142 
143 /* CR2: Control register 2 */
144 #define DFSDM_CR2_IE_MASK	GENMASK(6, 0)
145 #define DFSDM_CR2_IE(v)		FIELD_PREP(DFSDM_CR2_IE_MASK, v)
146 #define DFSDM_CR2_JEOCIE_MASK	BIT(0)
147 #define DFSDM_CR2_JEOCIE(v)	FIELD_PREP(DFSDM_CR2_JEOCIE_MASK, v)
148 #define DFSDM_CR2_REOCIE_MASK	BIT(1)
149 #define DFSDM_CR2_REOCIE(v)	FIELD_PREP(DFSDM_CR2_REOCIE_MASK, v)
150 #define DFSDM_CR2_JOVRIE_MASK	BIT(2)
151 #define DFSDM_CR2_JOVRIE(v)	FIELD_PREP(DFSDM_CR2_JOVRIE_MASK, v)
152 #define DFSDM_CR2_ROVRIE_MASK	BIT(3)
153 #define DFSDM_CR2_ROVRIE(v)	FIELD_PREP(DFSDM_CR2_ROVRIE_MASK, v)
154 #define DFSDM_CR2_AWDIE_MASK	BIT(4)
155 #define DFSDM_CR2_AWDIE(v)	FIELD_PREP(DFSDM_CR2_AWDIE_MASK, v)
156 #define DFSDM_CR2_SCDIE_MASK	BIT(5)
157 #define DFSDM_CR2_SCDIE(v)	FIELD_PREP(DFSDM_CR2_SCDIE_MASK, v)
158 #define DFSDM_CR2_CKABIE_MASK	BIT(6)
159 #define DFSDM_CR2_CKABIE(v)	FIELD_PREP(DFSDM_CR2_CKABIE_MASK, v)
160 #define DFSDM_CR2_EXCH_MASK	GENMASK(15, 8)
161 #define DFSDM_CR2_EXCH(v)	FIELD_PREP(DFSDM_CR2_EXCH_MASK, v)
162 #define DFSDM_CR2_AWDCH_MASK	GENMASK(23, 16)
163 #define DFSDM_CR2_AWDCH(v)	FIELD_PREP(DFSDM_CR2_AWDCH_MASK, v)
164 
165 /* ISR: Interrupt status register */
166 #define DFSDM_ISR_JEOCF_MASK	BIT(0)
167 #define DFSDM_ISR_JEOCF(v)	FIELD_PREP(DFSDM_ISR_JEOCF_MASK, v)
168 #define DFSDM_ISR_REOCF_MASK	BIT(1)
169 #define DFSDM_ISR_REOCF(v)	FIELD_PREP(DFSDM_ISR_REOCF_MASK, v)
170 #define DFSDM_ISR_JOVRF_MASK	BIT(2)
171 #define DFSDM_ISR_JOVRF(v)	FIELD_PREP(DFSDM_ISR_JOVRF_MASK, v)
172 #define DFSDM_ISR_ROVRF_MASK	BIT(3)
173 #define DFSDM_ISR_ROVRF(v)	FIELD_PREP(DFSDM_ISR_ROVRF_MASK, v)
174 #define DFSDM_ISR_AWDF_MASK	BIT(4)
175 #define DFSDM_ISR_AWDF(v)	FIELD_PREP(DFSDM_ISR_AWDF_MASK, v)
176 #define DFSDM_ISR_JCIP_MASK	BIT(13)
177 #define DFSDM_ISR_JCIP(v)	FIELD_PREP(DFSDM_ISR_JCIP_MASK, v)
178 #define DFSDM_ISR_RCIP_MASK	BIT(14)
179 #define DFSDM_ISR_RCIP(v)	FIELD_PREP(DFSDM_ISR_RCIP, v)
180 #define DFSDM_ISR_CKABF_MASK	GENMASK(23, 16)
181 #define DFSDM_ISR_CKABF(v)	FIELD_PREP(DFSDM_ISR_CKABF_MASK, v)
182 #define DFSDM_ISR_SCDF_MASK	GENMASK(31, 24)
183 #define DFSDM_ISR_SCDF(v)	FIELD_PREP(DFSDM_ISR_SCDF_MASK, v)
184 
185 /* ICR: Interrupt flag clear register */
186 #define DFSDM_ICR_CLRJOVRF_MASK	      BIT(2)
187 #define DFSDM_ICR_CLRJOVRF(v)	      FIELD_PREP(DFSDM_ICR_CLRJOVRF_MASK, v)
188 #define DFSDM_ICR_CLRROVRF_MASK	      BIT(3)
189 #define DFSDM_ICR_CLRROVRF(v)	      FIELD_PREP(DFSDM_ICR_CLRROVRF_MASK, v)
190 #define DFSDM_ICR_CLRCKABF_MASK	      GENMASK(23, 16)
191 #define DFSDM_ICR_CLRCKABF(v)	      FIELD_PREP(DFSDM_ICR_CLRCKABF_MASK, v)
192 #define DFSDM_ICR_CLRCKABF_CH_MASK(y) BIT(16 + (y))
193 #define DFSDM_ICR_CLRCKABF_CH(v, y)   \
194 			   (((v) << (16 + (y))) & DFSDM_ICR_CLRCKABF_CH_MASK(y))
195 #define DFSDM_ICR_CLRSCDF_MASK	      GENMASK(31, 24)
196 #define DFSDM_ICR_CLRSCDF(v)	      FIELD_PREP(DFSDM_ICR_CLRSCDF_MASK, v)
197 #define DFSDM_ICR_CLRSCDF_CH_MASK(y)  BIT(24 + (y))
198 #define DFSDM_ICR_CLRSCDF_CH(v, y)    \
199 			       (((v) << (24 + (y))) & DFSDM_ICR_CLRSCDF_MASK(y))
200 
201 /* FCR: Filter control register */
202 #define DFSDM_FCR_IOSR_MASK	GENMASK(7, 0)
203 #define DFSDM_FCR_IOSR(v)	FIELD_PREP(DFSDM_FCR_IOSR_MASK, v)
204 #define DFSDM_FCR_FOSR_MASK	GENMASK(25, 16)
205 #define DFSDM_FCR_FOSR(v)	FIELD_PREP(DFSDM_FCR_FOSR_MASK, v)
206 #define DFSDM_FCR_FORD_MASK	GENMASK(31, 29)
207 #define DFSDM_FCR_FORD(v)	FIELD_PREP(DFSDM_FCR_FORD_MASK, v)
208 
209 /* RDATAR: Filter data register for regular channel */
210 #define DFSDM_DATAR_CH_MASK	GENMASK(2, 0)
211 #define DFSDM_DATAR_DATA_OFFSET 8
212 #define DFSDM_DATAR_DATA_MASK	GENMASK(31, DFSDM_DATAR_DATA_OFFSET)
213 
214 /* AWLTR: Filter analog watchdog low threshold register */
215 #define DFSDM_AWLTR_BKAWL_MASK	GENMASK(3, 0)
216 #define DFSDM_AWLTR_BKAWL(v)	FIELD_PREP(DFSDM_AWLTR_BKAWL_MASK, v)
217 #define DFSDM_AWLTR_AWLT_MASK	GENMASK(31, 8)
218 #define DFSDM_AWLTR_AWLT(v)	FIELD_PREP(DFSDM_AWLTR_AWLT_MASK, v)
219 
220 /* AWHTR: Filter analog watchdog low threshold register */
221 #define DFSDM_AWHTR_BKAWH_MASK	GENMASK(3, 0)
222 #define DFSDM_AWHTR_BKAWH(v)	FIELD_PREP(DFSDM_AWHTR_BKAWH_MASK, v)
223 #define DFSDM_AWHTR_AWHT_MASK	GENMASK(31, 8)
224 #define DFSDM_AWHTR_AWHT(v)	FIELD_PREP(DFSDM_AWHTR_AWHT_MASK, v)
225 
226 /* AWSR: Filter watchdog status register */
227 #define DFSDM_AWSR_AWLTF_MASK	GENMASK(7, 0)
228 #define DFSDM_AWSR_AWLTF(v)	FIELD_PREP(DFSDM_AWSR_AWLTF_MASK, v)
229 #define DFSDM_AWSR_AWHTF_MASK	GENMASK(15, 8)
230 #define DFSDM_AWSR_AWHTF(v)	FIELD_PREP(DFSDM_AWSR_AWHTF_MASK, v)
231 
232 /* AWCFR: Filter watchdog status register */
233 #define DFSDM_AWCFR_AWLTF_MASK	GENMASK(7, 0)
234 #define DFSDM_AWCFR_AWLTF(v)	FIELD_PREP(DFSDM_AWCFR_AWLTF_MASK, v)
235 #define DFSDM_AWCFR_AWHTF_MASK	GENMASK(15, 8)
236 #define DFSDM_AWCFR_AWHTF(v)	FIELD_PREP(DFSDM_AWCFR_AWHTF_MASK, v)
237 
238 /*
239  * Identification register definitions
240  */
241 #define DFSDM_HWCFGR		0x7F0
242 #define DFSDM_VERR		0x7F4
243 #define DFSDM_IPIDR		0x7F8
244 #define DFSDM_SIDR		0x7FC
245 
246 /* HWCFGR: Hardware configuration register */
247 #define DFSDM_HWCFGR_NBT_MASK	GENMASK(7, 0)
248 #define DFSDM_HWCFGR_NBF_MASK	GENMASK(15, 8)
249 
250 /* VERR: Version register */
251 #define DFSDM_VERR_MINREV_MASK	GENMASK(3, 0)
252 #define DFSDM_VERR_MAJREV_MASK	GENMASK(7, 4)
253 
254 #define STM32MP15_IPIDR_NUMBER	0x00110031
255 
256 /* DFSDM filter order  */
257 enum stm32_dfsdm_sinc_order {
258 	DFSDM_FASTSINC_ORDER, /* FastSinc filter type */
259 	DFSDM_SINC1_ORDER,    /* Sinc 1 filter type */
260 	DFSDM_SINC2_ORDER,    /* Sinc 2 filter type */
261 	DFSDM_SINC3_ORDER,    /* Sinc 3 filter type */
262 	DFSDM_SINC4_ORDER,    /* Sinc 4 filter type (N.A. for watchdog) */
263 	DFSDM_SINC5_ORDER,    /* Sinc 5 filter type (N.A. for watchdog) */
264 	DFSDM_NB_SINC_ORDER,
265 };
266 
267 /**
268  * struct stm32_dfsdm_filter_osr - DFSDM filter settings linked to oversampling
269  * @iosr: integrator oversampling
270  * @fosr: filter oversampling
271  * @rshift: output sample right shift (hardware shift)
272  * @lshift: output sample left shift (software shift)
273  * @res: output sample resolution
274  * @bits: output sample resolution in bits
275  * @max: output sample maximum positive value
276  */
277 struct stm32_dfsdm_filter_osr {
278 	unsigned int iosr;
279 	unsigned int fosr;
280 	unsigned int rshift;
281 	unsigned int lshift;
282 	u64 res;
283 	u32 bits;
284 	s32 max;
285 };
286 
287 /**
288  * struct stm32_dfsdm_filter - structure relative to stm32 FDSDM filter
289  * @ford: filter order
290  * @flo: filter oversampling data table indexed by fast mode flag
291  * @sync_mode: filter synchronized with filter 0
292  * @fast: filter fast mode
293  */
294 struct stm32_dfsdm_filter {
295 	enum stm32_dfsdm_sinc_order ford;
296 	struct stm32_dfsdm_filter_osr flo[2];
297 	unsigned int sync_mode;
298 	unsigned int fast;
299 };
300 
301 /**
302  * struct stm32_dfsdm_channel - structure relative to stm32 FDSDM channel
303  * @id: id of the channel
304  * @type: interface type linked to stm32_dfsdm_chan_type
305  * @src: interface type linked to stm32_dfsdm_chan_src
306  * @alt_si: alternative serial input interface
307  */
308 struct stm32_dfsdm_channel {
309 	unsigned int id;
310 	unsigned int type;
311 	unsigned int src;
312 	unsigned int alt_si;
313 };
314 
315 /**
316  * struct stm32_dfsdm - stm32 FDSDM driver common data (for all instances)
317  * @base:	control registers base cpu addr
318  * @phys_base:	DFSDM IP register physical address
319  * @regmap:	regmap for register read/write
320  * @fl_list:	filter resources list
321  * @num_fls:	number of filter resources available
322  * @ch_list:	channel resources list
323  * @num_chs:	number of channel resources available
324  * @spi_master_freq: SPI clock out frequency
325  */
326 struct stm32_dfsdm {
327 	void __iomem	*base;
328 	phys_addr_t	phys_base;
329 	struct regmap *regmap;
330 	struct stm32_dfsdm_filter *fl_list;
331 	unsigned int num_fls;
332 	struct stm32_dfsdm_channel *ch_list;
333 	unsigned int num_chs;
334 	unsigned int spi_master_freq;
335 };
336 
337 /* DFSDM channel serial spi clock source */
338 enum stm32_dfsdm_spi_clk_src {
339 	DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL,
340 	DFSDM_CHANNEL_SPI_CLOCK_INTERNAL,
341 	DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING,
342 	DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING
343 };
344 
345 int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm);
346 int stm32_dfsdm_stop_dfsdm(struct stm32_dfsdm *dfsdm);
347 
348 #endif
349