1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Freescale i.MX7D ADC driver
4 *
5 * Copyright (C) 2015 Freescale Semiconductor, Inc.
6 */
7
8 #include <linux/clk.h>
9 #include <linux/completion.h>
10 #include <linux/err.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/platform_device.h>
18 #include <linux/regulator/consumer.h>
19
20 #include <linux/iio/iio.h>
21 #include <linux/iio/driver.h>
22 #include <linux/iio/sysfs.h>
23
24 /* ADC register */
25 #define IMX7D_REG_ADC_CH_A_CFG1 0x00
26 #define IMX7D_REG_ADC_CH_A_CFG2 0x10
27 #define IMX7D_REG_ADC_CH_B_CFG1 0x20
28 #define IMX7D_REG_ADC_CH_B_CFG2 0x30
29 #define IMX7D_REG_ADC_CH_C_CFG1 0x40
30 #define IMX7D_REG_ADC_CH_C_CFG2 0x50
31 #define IMX7D_REG_ADC_CH_D_CFG1 0x60
32 #define IMX7D_REG_ADC_CH_D_CFG2 0x70
33 #define IMX7D_REG_ADC_CH_SW_CFG 0x80
34 #define IMX7D_REG_ADC_TIMER_UNIT 0x90
35 #define IMX7D_REG_ADC_DMA_FIFO 0xa0
36 #define IMX7D_REG_ADC_FIFO_STATUS 0xb0
37 #define IMX7D_REG_ADC_INT_SIG_EN 0xc0
38 #define IMX7D_REG_ADC_INT_EN 0xd0
39 #define IMX7D_REG_ADC_INT_STATUS 0xe0
40 #define IMX7D_REG_ADC_CHA_B_CNV_RSLT 0xf0
41 #define IMX7D_REG_ADC_CHC_D_CNV_RSLT 0x100
42 #define IMX7D_REG_ADC_CH_SW_CNV_RSLT 0x110
43 #define IMX7D_REG_ADC_DMA_FIFO_DAT 0x120
44 #define IMX7D_REG_ADC_ADC_CFG 0x130
45
46 #define IMX7D_REG_ADC_CHANNEL_CFG2_BASE 0x10
47 #define IMX7D_EACH_CHANNEL_REG_OFFSET 0x20
48
49 #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN (0x1 << 31)
50 #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_SINGLE BIT(30)
51 #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_AVG_EN BIT(29)
52 #define IMX7D_REG_ADC_CH_CFG1_CHANNEL_SEL(x) ((x) << 24)
53
54 #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_4 (0x0 << 12)
55 #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_8 (0x1 << 12)
56 #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_16 (0x2 << 12)
57 #define IMX7D_REG_ADC_CH_CFG2_AVG_NUM_32 (0x3 << 12)
58
59 #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_4 (0x0 << 29)
60 #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_8 (0x1 << 29)
61 #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_16 (0x2 << 29)
62 #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_32 (0x3 << 29)
63 #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_64 (0x4 << 29)
64 #define IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_128 (0x5 << 29)
65
66 #define IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN BIT(31)
67 #define IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN BIT(1)
68 #define IMX7D_REG_ADC_ADC_CFG_ADC_EN BIT(0)
69
70 #define IMX7D_REG_ADC_INT_CHA_COV_INT_EN BIT(8)
71 #define IMX7D_REG_ADC_INT_CHB_COV_INT_EN BIT(9)
72 #define IMX7D_REG_ADC_INT_CHC_COV_INT_EN BIT(10)
73 #define IMX7D_REG_ADC_INT_CHD_COV_INT_EN BIT(11)
74 #define IMX7D_REG_ADC_INT_CHANNEL_INT_EN \
75 (IMX7D_REG_ADC_INT_CHA_COV_INT_EN | \
76 IMX7D_REG_ADC_INT_CHB_COV_INT_EN | \
77 IMX7D_REG_ADC_INT_CHC_COV_INT_EN | \
78 IMX7D_REG_ADC_INT_CHD_COV_INT_EN)
79 #define IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS 0xf00
80 #define IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT 0xf0000
81
82 #define IMX7D_ADC_TIMEOUT msecs_to_jiffies(100)
83 #define IMX7D_ADC_INPUT_CLK 24000000
84
85 enum imx7d_adc_clk_pre_div {
86 IMX7D_ADC_ANALOG_CLK_PRE_DIV_4,
87 IMX7D_ADC_ANALOG_CLK_PRE_DIV_8,
88 IMX7D_ADC_ANALOG_CLK_PRE_DIV_16,
89 IMX7D_ADC_ANALOG_CLK_PRE_DIV_32,
90 IMX7D_ADC_ANALOG_CLK_PRE_DIV_64,
91 IMX7D_ADC_ANALOG_CLK_PRE_DIV_128,
92 };
93
94 enum imx7d_adc_average_num {
95 IMX7D_ADC_AVERAGE_NUM_4,
96 IMX7D_ADC_AVERAGE_NUM_8,
97 IMX7D_ADC_AVERAGE_NUM_16,
98 IMX7D_ADC_AVERAGE_NUM_32,
99 };
100
101 struct imx7d_adc_feature {
102 enum imx7d_adc_clk_pre_div clk_pre_div;
103 enum imx7d_adc_average_num avg_num;
104
105 u32 core_time_unit; /* impact the sample rate */
106 };
107
108 struct imx7d_adc {
109 struct device *dev;
110 void __iomem *regs;
111 struct clk *clk;
112 /* lock to protect against multiple access to the device */
113 struct mutex lock;
114 u32 vref_uv;
115 u32 value;
116 u32 channel;
117 u32 pre_div_num;
118
119 struct regulator *vref;
120 struct imx7d_adc_feature adc_feature;
121
122 struct completion completion;
123 };
124
125 struct imx7d_adc_analogue_core_clk {
126 u32 pre_div;
127 u32 reg_config;
128 };
129
130 #define IMX7D_ADC_ANALOGUE_CLK_CONFIG(_pre_div, _reg_conf) { \
131 .pre_div = (_pre_div), \
132 .reg_config = (_reg_conf), \
133 }
134
135 static const struct imx7d_adc_analogue_core_clk imx7d_adc_analogue_clk[] = {
136 IMX7D_ADC_ANALOGUE_CLK_CONFIG(4, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_4),
137 IMX7D_ADC_ANALOGUE_CLK_CONFIG(8, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_8),
138 IMX7D_ADC_ANALOGUE_CLK_CONFIG(16, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_16),
139 IMX7D_ADC_ANALOGUE_CLK_CONFIG(32, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_32),
140 IMX7D_ADC_ANALOGUE_CLK_CONFIG(64, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_64),
141 IMX7D_ADC_ANALOGUE_CLK_CONFIG(128, IMX7D_REG_ADC_TIMER_UNIT_PRE_DIV_128),
142 };
143
144 #define IMX7D_ADC_CHAN(_idx) { \
145 .type = IIO_VOLTAGE, \
146 .indexed = 1, \
147 .channel = (_idx), \
148 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
149 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
150 BIT(IIO_CHAN_INFO_SAMP_FREQ), \
151 }
152
153 static const struct iio_chan_spec imx7d_adc_iio_channels[] = {
154 IMX7D_ADC_CHAN(0),
155 IMX7D_ADC_CHAN(1),
156 IMX7D_ADC_CHAN(2),
157 IMX7D_ADC_CHAN(3),
158 IMX7D_ADC_CHAN(4),
159 IMX7D_ADC_CHAN(5),
160 IMX7D_ADC_CHAN(6),
161 IMX7D_ADC_CHAN(7),
162 IMX7D_ADC_CHAN(8),
163 IMX7D_ADC_CHAN(9),
164 IMX7D_ADC_CHAN(10),
165 IMX7D_ADC_CHAN(11),
166 IMX7D_ADC_CHAN(12),
167 IMX7D_ADC_CHAN(13),
168 IMX7D_ADC_CHAN(14),
169 IMX7D_ADC_CHAN(15),
170 };
171
172 static const u32 imx7d_adc_average_num[] = {
173 IMX7D_REG_ADC_CH_CFG2_AVG_NUM_4,
174 IMX7D_REG_ADC_CH_CFG2_AVG_NUM_8,
175 IMX7D_REG_ADC_CH_CFG2_AVG_NUM_16,
176 IMX7D_REG_ADC_CH_CFG2_AVG_NUM_32,
177 };
178
imx7d_adc_feature_config(struct imx7d_adc * info)179 static void imx7d_adc_feature_config(struct imx7d_adc *info)
180 {
181 info->adc_feature.clk_pre_div = IMX7D_ADC_ANALOG_CLK_PRE_DIV_4;
182 info->adc_feature.avg_num = IMX7D_ADC_AVERAGE_NUM_32;
183 info->adc_feature.core_time_unit = 1;
184 }
185
imx7d_adc_sample_rate_set(struct imx7d_adc * info)186 static void imx7d_adc_sample_rate_set(struct imx7d_adc *info)
187 {
188 struct imx7d_adc_feature *adc_feature = &info->adc_feature;
189 struct imx7d_adc_analogue_core_clk adc_analogure_clk;
190 u32 i;
191 u32 tmp_cfg1;
192 u32 sample_rate = 0;
193
194 /*
195 * Before sample set, disable channel A,B,C,D. Here we
196 * clear the bit 31 of register REG_ADC_CH_A\B\C\D_CFG1.
197 */
198 for (i = 0; i < 4; i++) {
199 tmp_cfg1 =
200 readl(info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET);
201 tmp_cfg1 &= ~IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN;
202 writel(tmp_cfg1,
203 info->regs + i * IMX7D_EACH_CHANNEL_REG_OFFSET);
204 }
205
206 adc_analogure_clk = imx7d_adc_analogue_clk[adc_feature->clk_pre_div];
207 sample_rate |= adc_analogure_clk.reg_config;
208 info->pre_div_num = adc_analogure_clk.pre_div;
209
210 sample_rate |= adc_feature->core_time_unit;
211 writel(sample_rate, info->regs + IMX7D_REG_ADC_TIMER_UNIT);
212 }
213
imx7d_adc_hw_init(struct imx7d_adc * info)214 static void imx7d_adc_hw_init(struct imx7d_adc *info)
215 {
216 u32 cfg;
217
218 /* power up and enable adc analogue core */
219 cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);
220 cfg &= ~(IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN |
221 IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN);
222 cfg |= IMX7D_REG_ADC_ADC_CFG_ADC_EN;
223 writel(cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);
224
225 /* enable channel A,B,C,D interrupt */
226 writel(IMX7D_REG_ADC_INT_CHANNEL_INT_EN,
227 info->regs + IMX7D_REG_ADC_INT_SIG_EN);
228 writel(IMX7D_REG_ADC_INT_CHANNEL_INT_EN,
229 info->regs + IMX7D_REG_ADC_INT_EN);
230
231 imx7d_adc_sample_rate_set(info);
232 }
233
imx7d_adc_channel_set(struct imx7d_adc * info)234 static void imx7d_adc_channel_set(struct imx7d_adc *info)
235 {
236 u32 cfg1 = 0;
237 u32 cfg2;
238 u32 channel;
239
240 channel = info->channel;
241
242 /* the channel choose single conversion, and enable average mode */
243 cfg1 |= (IMX7D_REG_ADC_CH_CFG1_CHANNEL_EN |
244 IMX7D_REG_ADC_CH_CFG1_CHANNEL_SINGLE |
245 IMX7D_REG_ADC_CH_CFG1_CHANNEL_AVG_EN);
246
247 /*
248 * physical channel 0 chose logical channel A
249 * physical channel 1 chose logical channel B
250 * physical channel 2 chose logical channel C
251 * physical channel 3 chose logical channel D
252 */
253 cfg1 |= IMX7D_REG_ADC_CH_CFG1_CHANNEL_SEL(channel);
254
255 /*
256 * read register REG_ADC_CH_A\B\C\D_CFG2, according to the
257 * channel chosen
258 */
259 cfg2 = readl(info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel +
260 IMX7D_REG_ADC_CHANNEL_CFG2_BASE);
261
262 cfg2 |= imx7d_adc_average_num[info->adc_feature.avg_num];
263
264 /*
265 * write the register REG_ADC_CH_A\B\C\D_CFG2, according to
266 * the channel chosen
267 */
268 writel(cfg2, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel +
269 IMX7D_REG_ADC_CHANNEL_CFG2_BASE);
270 writel(cfg1, info->regs + IMX7D_EACH_CHANNEL_REG_OFFSET * channel);
271 }
272
imx7d_adc_get_sample_rate(struct imx7d_adc * info)273 static u32 imx7d_adc_get_sample_rate(struct imx7d_adc *info)
274 {
275 u32 analogue_core_clk;
276 u32 core_time_unit = info->adc_feature.core_time_unit;
277 u32 tmp;
278
279 analogue_core_clk = IMX7D_ADC_INPUT_CLK / info->pre_div_num;
280 tmp = (core_time_unit + 1) * 6;
281
282 return analogue_core_clk / tmp;
283 }
284
imx7d_adc_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)285 static int imx7d_adc_read_raw(struct iio_dev *indio_dev,
286 struct iio_chan_spec const *chan,
287 int *val,
288 int *val2,
289 long mask)
290 {
291 struct imx7d_adc *info = iio_priv(indio_dev);
292
293 u32 channel;
294 long ret;
295
296 switch (mask) {
297 case IIO_CHAN_INFO_RAW:
298 mutex_lock(&info->lock);
299 reinit_completion(&info->completion);
300
301 channel = chan->channel & 0x03;
302 info->channel = channel;
303 imx7d_adc_channel_set(info);
304
305 ret = wait_for_completion_interruptible_timeout
306 (&info->completion, IMX7D_ADC_TIMEOUT);
307 if (ret == 0) {
308 mutex_unlock(&info->lock);
309 return -ETIMEDOUT;
310 }
311 if (ret < 0) {
312 mutex_unlock(&info->lock);
313 return ret;
314 }
315
316 *val = info->value;
317 mutex_unlock(&info->lock);
318 return IIO_VAL_INT;
319
320 case IIO_CHAN_INFO_SCALE:
321 info->vref_uv = regulator_get_voltage(info->vref);
322 *val = info->vref_uv / 1000;
323 *val2 = 12;
324 return IIO_VAL_FRACTIONAL_LOG2;
325
326 case IIO_CHAN_INFO_SAMP_FREQ:
327 *val = imx7d_adc_get_sample_rate(info);
328 return IIO_VAL_INT;
329
330 default:
331 return -EINVAL;
332 }
333 }
334
imx7d_adc_read_data(struct imx7d_adc * info)335 static int imx7d_adc_read_data(struct imx7d_adc *info)
336 {
337 u32 channel;
338 u32 value;
339
340 channel = info->channel & 0x03;
341
342 /*
343 * channel A and B conversion result share one register,
344 * bit[27~16] is the channel B conversion result,
345 * bit[11~0] is the channel A conversion result.
346 * channel C and D is the same.
347 */
348 if (channel < 2)
349 value = readl(info->regs + IMX7D_REG_ADC_CHA_B_CNV_RSLT);
350 else
351 value = readl(info->regs + IMX7D_REG_ADC_CHC_D_CNV_RSLT);
352 if (channel & 0x1) /* channel B or D */
353 value = (value >> 16) & 0xFFF;
354 else /* channel A or C */
355 value &= 0xFFF;
356
357 return value;
358 }
359
imx7d_adc_isr(int irq,void * dev_id)360 static irqreturn_t imx7d_adc_isr(int irq, void *dev_id)
361 {
362 struct imx7d_adc *info = dev_id;
363 int status;
364
365 status = readl(info->regs + IMX7D_REG_ADC_INT_STATUS);
366 if (status & IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS) {
367 info->value = imx7d_adc_read_data(info);
368 complete(&info->completion);
369
370 /*
371 * The register IMX7D_REG_ADC_INT_STATUS can't clear
372 * itself after read operation, need software to write
373 * 0 to the related bit. Here we clear the channel A/B/C/D
374 * conversion finished flag.
375 */
376 status &= ~IMX7D_REG_ADC_INT_STATUS_CHANNEL_INT_STATUS;
377 writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);
378 }
379
380 /*
381 * If the channel A/B/C/D conversion timeout, report it and clear these
382 * timeout flags.
383 */
384 if (status & IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT) {
385 dev_err(info->dev,
386 "ADC got conversion time out interrupt: 0x%08x\n",
387 status);
388 status &= ~IMX7D_REG_ADC_INT_STATUS_CHANNEL_CONV_TIME_OUT;
389 writel(status, info->regs + IMX7D_REG_ADC_INT_STATUS);
390 }
391
392 return IRQ_HANDLED;
393 }
394
imx7d_adc_reg_access(struct iio_dev * indio_dev,unsigned reg,unsigned writeval,unsigned * readval)395 static int imx7d_adc_reg_access(struct iio_dev *indio_dev,
396 unsigned reg, unsigned writeval,
397 unsigned *readval)
398 {
399 struct imx7d_adc *info = iio_priv(indio_dev);
400
401 if (!readval || reg % 4 || reg > IMX7D_REG_ADC_ADC_CFG)
402 return -EINVAL;
403
404 *readval = readl(info->regs + reg);
405
406 return 0;
407 }
408
409 static const struct iio_info imx7d_adc_iio_info = {
410 .read_raw = &imx7d_adc_read_raw,
411 .debugfs_reg_access = &imx7d_adc_reg_access,
412 };
413
414 static const struct of_device_id imx7d_adc_match[] = {
415 { .compatible = "fsl,imx7d-adc", },
416 { /* sentinel */ }
417 };
418 MODULE_DEVICE_TABLE(of, imx7d_adc_match);
419
imx7d_adc_power_down(struct imx7d_adc * info)420 static void imx7d_adc_power_down(struct imx7d_adc *info)
421 {
422 u32 adc_cfg;
423
424 adc_cfg = readl(info->regs + IMX7D_REG_ADC_ADC_CFG);
425 adc_cfg |= IMX7D_REG_ADC_ADC_CFG_ADC_CLK_DOWN |
426 IMX7D_REG_ADC_ADC_CFG_ADC_POWER_DOWN;
427 adc_cfg &= ~IMX7D_REG_ADC_ADC_CFG_ADC_EN;
428 writel(adc_cfg, info->regs + IMX7D_REG_ADC_ADC_CFG);
429 }
430
imx7d_adc_enable(struct device * dev)431 static int imx7d_adc_enable(struct device *dev)
432 {
433 struct iio_dev *indio_dev = dev_get_drvdata(dev);
434 struct imx7d_adc *info = iio_priv(indio_dev);
435 int ret;
436
437 ret = regulator_enable(info->vref);
438 if (ret) {
439 dev_err(info->dev,
440 "Can't enable adc reference top voltage, err = %d\n",
441 ret);
442 return ret;
443 }
444
445 ret = clk_prepare_enable(info->clk);
446 if (ret) {
447 dev_err(info->dev,
448 "Could not prepare or enable clock.\n");
449 regulator_disable(info->vref);
450 return ret;
451 }
452
453 imx7d_adc_hw_init(info);
454
455 return 0;
456 }
457
imx7d_adc_disable(struct device * dev)458 static int imx7d_adc_disable(struct device *dev)
459 {
460 struct iio_dev *indio_dev = dev_get_drvdata(dev);
461 struct imx7d_adc *info = iio_priv(indio_dev);
462
463 imx7d_adc_power_down(info);
464
465 clk_disable_unprepare(info->clk);
466 regulator_disable(info->vref);
467
468 return 0;
469 }
470
__imx7d_adc_disable(void * data)471 static void __imx7d_adc_disable(void *data)
472 {
473 imx7d_adc_disable(data);
474 }
475
imx7d_adc_probe(struct platform_device * pdev)476 static int imx7d_adc_probe(struct platform_device *pdev)
477 {
478 struct imx7d_adc *info;
479 struct iio_dev *indio_dev;
480 struct device *dev = &pdev->dev;
481 int irq;
482 int ret;
483
484 indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
485 if (!indio_dev) {
486 dev_err(&pdev->dev, "Failed allocating iio device\n");
487 return -ENOMEM;
488 }
489
490 info = iio_priv(indio_dev);
491 info->dev = dev;
492
493 info->regs = devm_platform_ioremap_resource(pdev, 0);
494 if (IS_ERR(info->regs))
495 return PTR_ERR(info->regs);
496
497 irq = platform_get_irq(pdev, 0);
498 if (irq < 0)
499 return irq;
500
501 info->clk = devm_clk_get(dev, "adc");
502 if (IS_ERR(info->clk))
503 return dev_err_probe(dev, PTR_ERR(info->clk), "Failed getting clock\n");
504
505 info->vref = devm_regulator_get(dev, "vref");
506 if (IS_ERR(info->vref))
507 return dev_err_probe(dev, PTR_ERR(info->vref),
508 "Failed getting reference voltage\n");
509
510 platform_set_drvdata(pdev, indio_dev);
511
512 init_completion(&info->completion);
513
514 indio_dev->name = dev_name(dev);
515 indio_dev->info = &imx7d_adc_iio_info;
516 indio_dev->modes = INDIO_DIRECT_MODE;
517 indio_dev->channels = imx7d_adc_iio_channels;
518 indio_dev->num_channels = ARRAY_SIZE(imx7d_adc_iio_channels);
519
520 ret = devm_request_irq(dev, irq, imx7d_adc_isr, 0, dev_name(dev), info);
521 if (ret < 0) {
522 dev_err(dev, "Failed requesting irq, irq = %d\n", irq);
523 return ret;
524 }
525
526 imx7d_adc_feature_config(info);
527
528 ret = imx7d_adc_enable(dev);
529 if (ret)
530 return ret;
531
532 ret = devm_add_action_or_reset(dev, __imx7d_adc_disable, dev);
533 if (ret)
534 return ret;
535
536 mutex_init(&info->lock);
537
538 ret = devm_iio_device_register(dev, indio_dev);
539 if (ret) {
540 dev_err(&pdev->dev, "Couldn't register the device.\n");
541 return ret;
542 }
543
544 return 0;
545 }
546
547 static DEFINE_SIMPLE_DEV_PM_OPS(imx7d_adc_pm_ops, imx7d_adc_disable,
548 imx7d_adc_enable);
549
550 static struct platform_driver imx7d_adc_driver = {
551 .probe = imx7d_adc_probe,
552 .driver = {
553 .name = "imx7d_adc",
554 .of_match_table = imx7d_adc_match,
555 .pm = pm_sleep_ptr(&imx7d_adc_pm_ops),
556 },
557 };
558
559 module_platform_driver(imx7d_adc_driver);
560
561 MODULE_AUTHOR("Haibo Chen <haibo.chen@freescale.com>");
562 MODULE_DESCRIPTION("Freescale IMX7D ADC driver");
563 MODULE_LICENSE("GPL v2");
564