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Linux/drivers/rtc/rtc-pcf8563.c

  1 /*
  2  * An I2C driver for the Philips PCF8563 RTC
  3  * Copyright 2005-06 Tower Technologies
  4  *
  5  * Author: Alessandro Zummo <a.zummo@towertech.it>
  6  * Maintainers: http://www.nslu2-linux.org/
  7  *
  8  * based on the other drivers in this same directory.
  9  *
 10  * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License version 2 as
 14  * published by the Free Software Foundation.
 15  */
 16 
 17 #include <linux/clk-provider.h>
 18 #include <linux/i2c.h>
 19 #include <linux/bcd.h>
 20 #include <linux/rtc.h>
 21 #include <linux/slab.h>
 22 #include <linux/module.h>
 23 #include <linux/of.h>
 24 #include <linux/err.h>
 25 
 26 #define PCF8563_REG_ST1         0x00 /* status */
 27 #define PCF8563_REG_ST2         0x01
 28 #define PCF8563_BIT_AIE         (1 << 1)
 29 #define PCF8563_BIT_AF          (1 << 3)
 30 #define PCF8563_BITS_ST2_N      (7 << 5)
 31 
 32 #define PCF8563_REG_SC          0x02 /* datetime */
 33 #define PCF8563_REG_MN          0x03
 34 #define PCF8563_REG_HR          0x04
 35 #define PCF8563_REG_DM          0x05
 36 #define PCF8563_REG_DW          0x06
 37 #define PCF8563_REG_MO          0x07
 38 #define PCF8563_REG_YR          0x08
 39 
 40 #define PCF8563_REG_AMN         0x09 /* alarm */
 41 
 42 #define PCF8563_REG_CLKO                0x0D /* clock out */
 43 #define PCF8563_REG_CLKO_FE             0x80 /* clock out enabled */
 44 #define PCF8563_REG_CLKO_F_MASK         0x03 /* frequenc mask */
 45 #define PCF8563_REG_CLKO_F_32768HZ      0x00
 46 #define PCF8563_REG_CLKO_F_1024HZ       0x01
 47 #define PCF8563_REG_CLKO_F_32HZ         0x02
 48 #define PCF8563_REG_CLKO_F_1HZ          0x03
 49 
 50 #define PCF8563_REG_TMRC        0x0E /* timer control */
 51 #define PCF8563_TMRC_ENABLE     BIT(7)
 52 #define PCF8563_TMRC_4096       0
 53 #define PCF8563_TMRC_64         1
 54 #define PCF8563_TMRC_1          2
 55 #define PCF8563_TMRC_1_60       3
 56 #define PCF8563_TMRC_MASK       3
 57 
 58 #define PCF8563_REG_TMR         0x0F /* timer */
 59 
 60 #define PCF8563_SC_LV           0x80 /* low voltage */
 61 #define PCF8563_MO_C            0x80 /* century */
 62 
 63 static struct i2c_driver pcf8563_driver;
 64 
 65 struct pcf8563 {
 66         struct rtc_device *rtc;
 67         /*
 68          * The meaning of MO_C bit varies by the chip type.
 69          * From PCF8563 datasheet: this bit is toggled when the years
 70          * register overflows from 99 to 00
 71          *   0 indicates the century is 20xx
 72          *   1 indicates the century is 19xx
 73          * From RTC8564 datasheet: this bit indicates change of
 74          * century. When the year digit data overflows from 99 to 00,
 75          * this bit is set. By presetting it to 0 while still in the
 76          * 20th century, it will be set in year 2000, ...
 77          * There seems no reliable way to know how the system use this
 78          * bit.  So let's do it heuristically, assuming we are live in
 79          * 1970...2069.
 80          */
 81         int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
 82         int voltage_low; /* incicates if a low_voltage was detected */
 83 
 84         struct i2c_client *client;
 85 #ifdef CONFIG_COMMON_CLK
 86         struct clk_hw           clkout_hw;
 87 #endif
 88 };
 89 
 90 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
 91                                    unsigned char length, unsigned char *buf)
 92 {
 93         struct i2c_msg msgs[] = {
 94                 {/* setup read ptr */
 95                         .addr = client->addr,
 96                         .len = 1,
 97                         .buf = &reg,
 98                 },
 99                 {
100                         .addr = client->addr,
101                         .flags = I2C_M_RD,
102                         .len = length,
103                         .buf = buf
104                 },
105         };
106 
107         if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
108                 dev_err(&client->dev, "%s: read error\n", __func__);
109                 return -EIO;
110         }
111 
112         return 0;
113 }
114 
115 static int pcf8563_write_block_data(struct i2c_client *client,
116                                    unsigned char reg, unsigned char length,
117                                    unsigned char *buf)
118 {
119         int i, err;
120 
121         for (i = 0; i < length; i++) {
122                 unsigned char data[2] = { reg + i, buf[i] };
123 
124                 err = i2c_master_send(client, data, sizeof(data));
125                 if (err != sizeof(data)) {
126                         dev_err(&client->dev,
127                                 "%s: err=%d addr=%02x, data=%02x\n",
128                                 __func__, err, data[0], data[1]);
129                         return -EIO;
130                 }
131         }
132 
133         return 0;
134 }
135 
136 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
137 {
138         unsigned char buf;
139         int err;
140 
141         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
142         if (err < 0)
143                 return err;
144 
145         if (on)
146                 buf |= PCF8563_BIT_AIE;
147         else
148                 buf &= ~PCF8563_BIT_AIE;
149 
150         buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
151 
152         err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
153         if (err < 0) {
154                 dev_err(&client->dev, "%s: write error\n", __func__);
155                 return -EIO;
156         }
157 
158         return 0;
159 }
160 
161 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
162                                   unsigned char *pen)
163 {
164         unsigned char buf;
165         int err;
166 
167         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
168         if (err)
169                 return err;
170 
171         if (en)
172                 *en = !!(buf & PCF8563_BIT_AIE);
173         if (pen)
174                 *pen = !!(buf & PCF8563_BIT_AF);
175 
176         return 0;
177 }
178 
179 static irqreturn_t pcf8563_irq(int irq, void *dev_id)
180 {
181         struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
182         int err;
183         char pending;
184 
185         err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
186         if (err)
187                 return IRQ_NONE;
188 
189         if (pending) {
190                 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
191                 pcf8563_set_alarm_mode(pcf8563->client, 1);
192                 return IRQ_HANDLED;
193         }
194 
195         return IRQ_NONE;
196 }
197 
198 /*
199  * In the routines that deal directly with the pcf8563 hardware, we use
200  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
201  */
202 static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
203 {
204         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
205         unsigned char buf[9];
206         int err;
207 
208         err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
209         if (err)
210                 return err;
211 
212         if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
213                 pcf8563->voltage_low = 1;
214                 dev_err(&client->dev,
215                         "low voltage detected, date/time is not reliable.\n");
216                 return -EINVAL;
217         }
218 
219         dev_dbg(&client->dev,
220                 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
221                 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
222                 __func__,
223                 buf[0], buf[1], buf[2], buf[3],
224                 buf[4], buf[5], buf[6], buf[7],
225                 buf[8]);
226 
227 
228         tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
229         tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
230         tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
231         tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
232         tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
233         tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
234         tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
235         if (tm->tm_year < 70)
236                 tm->tm_year += 100;     /* assume we are in 1970...2069 */
237         /* detect the polarity heuristically. see note above. */
238         pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
239                 (tm->tm_year >= 100) : (tm->tm_year < 100);
240 
241         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
242                 "mday=%d, mon=%d, year=%d, wday=%d\n",
243                 __func__,
244                 tm->tm_sec, tm->tm_min, tm->tm_hour,
245                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
246 
247         return 0;
248 }
249 
250 static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
251 {
252         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
253         unsigned char buf[9];
254 
255         dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
256                 "mday=%d, mon=%d, year=%d, wday=%d\n",
257                 __func__,
258                 tm->tm_sec, tm->tm_min, tm->tm_hour,
259                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
260 
261         /* hours, minutes and seconds */
262         buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
263         buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
264         buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
265 
266         buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
267 
268         /* month, 1 - 12 */
269         buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
270 
271         /* year and century */
272         buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
273         if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
274                 buf[PCF8563_REG_MO] |= PCF8563_MO_C;
275 
276         buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
277 
278         return pcf8563_write_block_data(client, PCF8563_REG_SC,
279                                 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
280 }
281 
282 #ifdef CONFIG_RTC_INTF_DEV
283 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
284 {
285         struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
286         struct rtc_time tm;
287 
288         switch (cmd) {
289         case RTC_VL_READ:
290                 if (pcf8563->voltage_low)
291                         dev_info(dev, "low voltage detected, date/time is not reliable.\n");
292 
293                 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
294                                         sizeof(int)))
295                         return -EFAULT;
296                 return 0;
297         case RTC_VL_CLR:
298                 /*
299                  * Clear the VL bit in the seconds register in case
300                  * the time has not been set already (which would
301                  * have cleared it). This does not really matter
302                  * because of the cached voltage_low value but do it
303                  * anyway for consistency.
304                  */
305                 if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
306                         pcf8563_set_datetime(to_i2c_client(dev), &tm);
307 
308                 /* Clear the cached value. */
309                 pcf8563->voltage_low = 0;
310 
311                 return 0;
312         default:
313                 return -ENOIOCTLCMD;
314         }
315 }
316 #else
317 #define pcf8563_rtc_ioctl NULL
318 #endif
319 
320 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
321 {
322         return pcf8563_get_datetime(to_i2c_client(dev), tm);
323 }
324 
325 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
326 {
327         return pcf8563_set_datetime(to_i2c_client(dev), tm);
328 }
329 
330 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
331 {
332         struct i2c_client *client = to_i2c_client(dev);
333         unsigned char buf[4];
334         int err;
335 
336         err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
337         if (err)
338                 return err;
339 
340         dev_dbg(&client->dev,
341                 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
342                 __func__, buf[0], buf[1], buf[2], buf[3]);
343 
344         tm->time.tm_sec = 0;
345         tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
346         tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
347         tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
348         tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
349 
350         err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
351         if (err < 0)
352                 return err;
353 
354         dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
355                 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
356                 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
357                 tm->enabled, tm->pending);
358 
359         return 0;
360 }
361 
362 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
363 {
364         struct i2c_client *client = to_i2c_client(dev);
365         unsigned char buf[4];
366         int err;
367 
368         /* The alarm has no seconds, round up to nearest minute */
369         if (tm->time.tm_sec) {
370                 time64_t alarm_time = rtc_tm_to_time64(&tm->time);
371 
372                 alarm_time += 60 - tm->time.tm_sec;
373                 rtc_time64_to_tm(alarm_time, &tm->time);
374         }
375 
376         dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
377                 "enabled=%d pending=%d\n", __func__,
378                 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
379                 tm->time.tm_mday, tm->enabled, tm->pending);
380 
381         buf[0] = bin2bcd(tm->time.tm_min);
382         buf[1] = bin2bcd(tm->time.tm_hour);
383         buf[2] = bin2bcd(tm->time.tm_mday);
384         buf[3] = tm->time.tm_wday & 0x07;
385 
386         err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
387         if (err)
388                 return err;
389 
390         return pcf8563_set_alarm_mode(client, 1);
391 }
392 
393 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
394 {
395         dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
396         return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
397 }
398 
399 #ifdef CONFIG_COMMON_CLK
400 /*
401  * Handling of the clkout
402  */
403 
404 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw)
405 
406 static int clkout_rates[] = {
407         32768,
408         1024,
409         32,
410         1,
411 };
412 
413 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw,
414                                                 unsigned long parent_rate)
415 {
416         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
417         struct i2c_client *client = pcf8563->client;
418         unsigned char buf;
419         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
420 
421         if (ret < 0)
422                 return 0;
423 
424         buf &= PCF8563_REG_CLKO_F_MASK;
425         return clkout_rates[ret];
426 }
427 
428 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
429                                       unsigned long *prate)
430 {
431         int i;
432 
433         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
434                 if (clkout_rates[i] <= rate)
435                         return clkout_rates[i];
436 
437         return 0;
438 }
439 
440 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
441                                    unsigned long parent_rate)
442 {
443         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
444         struct i2c_client *client = pcf8563->client;
445         unsigned char buf;
446         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
447         int i;
448 
449         if (ret < 0)
450                 return ret;
451 
452         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
453                 if (clkout_rates[i] == rate) {
454                         buf &= ~PCF8563_REG_CLKO_F_MASK;
455                         buf |= i;
456                         ret = pcf8563_write_block_data(client,
457                                                        PCF8563_REG_CLKO, 1,
458                                                        &buf);
459                         return ret;
460                 }
461 
462         return -EINVAL;
463 }
464 
465 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable)
466 {
467         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
468         struct i2c_client *client = pcf8563->client;
469         unsigned char buf;
470         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
471 
472         if (ret < 0)
473                 return ret;
474 
475         if (enable)
476                 buf |= PCF8563_REG_CLKO_FE;
477         else
478                 buf &= ~PCF8563_REG_CLKO_FE;
479 
480         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
481         return ret;
482 }
483 
484 static int pcf8563_clkout_prepare(struct clk_hw *hw)
485 {
486         return pcf8563_clkout_control(hw, 1);
487 }
488 
489 static void pcf8563_clkout_unprepare(struct clk_hw *hw)
490 {
491         pcf8563_clkout_control(hw, 0);
492 }
493 
494 static int pcf8563_clkout_is_prepared(struct clk_hw *hw)
495 {
496         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
497         struct i2c_client *client = pcf8563->client;
498         unsigned char buf;
499         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
500 
501         if (ret < 0)
502                 return ret;
503 
504         return !!(buf & PCF8563_REG_CLKO_FE);
505 }
506 
507 static const struct clk_ops pcf8563_clkout_ops = {
508         .prepare = pcf8563_clkout_prepare,
509         .unprepare = pcf8563_clkout_unprepare,
510         .is_prepared = pcf8563_clkout_is_prepared,
511         .recalc_rate = pcf8563_clkout_recalc_rate,
512         .round_rate = pcf8563_clkout_round_rate,
513         .set_rate = pcf8563_clkout_set_rate,
514 };
515 
516 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
517 {
518         struct i2c_client *client = pcf8563->client;
519         struct device_node *node = client->dev.of_node;
520         struct clk *clk;
521         struct clk_init_data init;
522         int ret;
523         unsigned char buf;
524 
525         /* disable the clkout output */
526         buf = 0;
527         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
528         if (ret < 0)
529                 return ERR_PTR(ret);
530 
531         init.name = "pcf8563-clkout";
532         init.ops = &pcf8563_clkout_ops;
533         init.flags = 0;
534         init.parent_names = NULL;
535         init.num_parents = 0;
536         pcf8563->clkout_hw.init = &init;
537 
538         /* optional override of the clockname */
539         of_property_read_string(node, "clock-output-names", &init.name);
540 
541         /* register the clock */
542         clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw);
543 
544         if (!IS_ERR(clk))
545                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
546 
547         return clk;
548 }
549 #endif
550 
551 static const struct rtc_class_ops pcf8563_rtc_ops = {
552         .ioctl          = pcf8563_rtc_ioctl,
553         .read_time      = pcf8563_rtc_read_time,
554         .set_time       = pcf8563_rtc_set_time,
555         .read_alarm     = pcf8563_rtc_read_alarm,
556         .set_alarm      = pcf8563_rtc_set_alarm,
557         .alarm_irq_enable = pcf8563_irq_enable,
558 };
559 
560 static int pcf8563_probe(struct i2c_client *client,
561                                 const struct i2c_device_id *id)
562 {
563         struct pcf8563 *pcf8563;
564         int err;
565         unsigned char buf;
566         unsigned char alm_pending;
567 
568         dev_dbg(&client->dev, "%s\n", __func__);
569 
570         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
571                 return -ENODEV;
572 
573         pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
574                                 GFP_KERNEL);
575         if (!pcf8563)
576                 return -ENOMEM;
577 
578         i2c_set_clientdata(client, pcf8563);
579         pcf8563->client = client;
580         device_set_wakeup_capable(&client->dev, 1);
581 
582         /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
583         buf = PCF8563_TMRC_1_60;
584         err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
585         if (err < 0) {
586                 dev_err(&client->dev, "%s: write error\n", __func__);
587                 return err;
588         }
589 
590         err = pcf8563_get_alarm_mode(client, NULL, &alm_pending);
591         if (err) {
592                 dev_err(&client->dev, "%s: read error\n", __func__);
593                 return err;
594         }
595         if (alm_pending)
596                 pcf8563_set_alarm_mode(client, 0);
597 
598         pcf8563->rtc = devm_rtc_device_register(&client->dev,
599                                 pcf8563_driver.driver.name,
600                                 &pcf8563_rtc_ops, THIS_MODULE);
601 
602         if (IS_ERR(pcf8563->rtc))
603                 return PTR_ERR(pcf8563->rtc);
604 
605         if (client->irq > 0) {
606                 err = devm_request_threaded_irq(&client->dev, client->irq,
607                                 NULL, pcf8563_irq,
608                                 IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
609                                 pcf8563->rtc->name, client);
610                 if (err) {
611                         dev_err(&client->dev, "unable to request IRQ %d\n",
612                                                                 client->irq);
613                         return err;
614                 }
615 
616         }
617 
618 #ifdef CONFIG_COMMON_CLK
619         /* register clk in common clk framework */
620         pcf8563_clkout_register_clk(pcf8563);
621 #endif
622 
623         /* the pcf8563 alarm only supports a minute accuracy */
624         pcf8563->rtc->uie_unsupported = 1;
625 
626         return 0;
627 }
628 
629 static const struct i2c_device_id pcf8563_id[] = {
630         { "pcf8563", 0 },
631         { "rtc8564", 0 },
632         { }
633 };
634 MODULE_DEVICE_TABLE(i2c, pcf8563_id);
635 
636 #ifdef CONFIG_OF
637 static const struct of_device_id pcf8563_of_match[] = {
638         { .compatible = "nxp,pcf8563" },
639         {}
640 };
641 MODULE_DEVICE_TABLE(of, pcf8563_of_match);
642 #endif
643 
644 static struct i2c_driver pcf8563_driver = {
645         .driver         = {
646                 .name   = "rtc-pcf8563",
647                 .of_match_table = of_match_ptr(pcf8563_of_match),
648         },
649         .probe          = pcf8563_probe,
650         .id_table       = pcf8563_id,
651 };
652 
653 module_i2c_driver(pcf8563_driver);
654 
655 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
656 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
657 MODULE_LICENSE("GPL");
658 

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