Merge tag 'rtc-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
[sfrench/cifs-2.6.git] / drivers / rtc / rtc-pcf8563.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * An I2C driver for the Philips PCF8563 RTC
4  * Copyright 2005-06 Tower Technologies
5  *
6  * Author: Alessandro Zummo <a.zummo@towertech.it>
7  * Maintainers: http://www.nslu2-linux.org/
8  *
9  * based on the other drivers in this same directory.
10  *
11  * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
12  */
13
14 #include <linux/clk-provider.h>
15 #include <linux/i2c.h>
16 #include <linux/bcd.h>
17 #include <linux/rtc.h>
18 #include <linux/slab.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21 #include <linux/err.h>
22
23 #define PCF8563_REG_ST1         0x00 /* status */
24 #define PCF8563_REG_ST2         0x01
25 #define PCF8563_BIT_AIE         (1 << 1)
26 #define PCF8563_BIT_AF          (1 << 3)
27 #define PCF8563_BITS_ST2_N      (7 << 5)
28
29 #define PCF8563_REG_SC          0x02 /* datetime */
30 #define PCF8563_REG_MN          0x03
31 #define PCF8563_REG_HR          0x04
32 #define PCF8563_REG_DM          0x05
33 #define PCF8563_REG_DW          0x06
34 #define PCF8563_REG_MO          0x07
35 #define PCF8563_REG_YR          0x08
36
37 #define PCF8563_REG_AMN         0x09 /* alarm */
38
39 #define PCF8563_REG_CLKO                0x0D /* clock out */
40 #define PCF8563_REG_CLKO_FE             0x80 /* clock out enabled */
41 #define PCF8563_REG_CLKO_F_MASK         0x03 /* frequenc mask */
42 #define PCF8563_REG_CLKO_F_32768HZ      0x00
43 #define PCF8563_REG_CLKO_F_1024HZ       0x01
44 #define PCF8563_REG_CLKO_F_32HZ         0x02
45 #define PCF8563_REG_CLKO_F_1HZ          0x03
46
47 #define PCF8563_REG_TMRC        0x0E /* timer control */
48 #define PCF8563_TMRC_ENABLE     BIT(7)
49 #define PCF8563_TMRC_4096       0
50 #define PCF8563_TMRC_64         1
51 #define PCF8563_TMRC_1          2
52 #define PCF8563_TMRC_1_60       3
53 #define PCF8563_TMRC_MASK       3
54
55 #define PCF8563_REG_TMR         0x0F /* timer */
56
57 #define PCF8563_SC_LV           0x80 /* low voltage */
58 #define PCF8563_MO_C            0x80 /* century */
59
60 static struct i2c_driver pcf8563_driver;
61
62 struct pcf8563 {
63         struct rtc_device *rtc;
64         /*
65          * The meaning of MO_C bit varies by the chip type.
66          * From PCF8563 datasheet: this bit is toggled when the years
67          * register overflows from 99 to 00
68          *   0 indicates the century is 20xx
69          *   1 indicates the century is 19xx
70          * From RTC8564 datasheet: this bit indicates change of
71          * century. When the year digit data overflows from 99 to 00,
72          * this bit is set. By presetting it to 0 while still in the
73          * 20th century, it will be set in year 2000, ...
74          * There seems no reliable way to know how the system use this
75          * bit.  So let's do it heuristically, assuming we are live in
76          * 1970...2069.
77          */
78         int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
79         int voltage_low; /* incicates if a low_voltage was detected */
80
81         struct i2c_client *client;
82 #ifdef CONFIG_COMMON_CLK
83         struct clk_hw           clkout_hw;
84 #endif
85 };
86
87 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
88                                    unsigned char length, unsigned char *buf)
89 {
90         struct i2c_msg msgs[] = {
91                 {/* setup read ptr */
92                         .addr = client->addr,
93                         .len = 1,
94                         .buf = &reg,
95                 },
96                 {
97                         .addr = client->addr,
98                         .flags = I2C_M_RD,
99                         .len = length,
100                         .buf = buf
101                 },
102         };
103
104         if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
105                 dev_err(&client->dev, "%s: read error\n", __func__);
106                 return -EIO;
107         }
108
109         return 0;
110 }
111
112 static int pcf8563_write_block_data(struct i2c_client *client,
113                                    unsigned char reg, unsigned char length,
114                                    unsigned char *buf)
115 {
116         int i, err;
117
118         for (i = 0; i < length; i++) {
119                 unsigned char data[2] = { reg + i, buf[i] };
120
121                 err = i2c_master_send(client, data, sizeof(data));
122                 if (err != sizeof(data)) {
123                         dev_err(&client->dev,
124                                 "%s: err=%d addr=%02x, data=%02x\n",
125                                 __func__, err, data[0], data[1]);
126                         return -EIO;
127                 }
128         }
129
130         return 0;
131 }
132
133 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
134 {
135         unsigned char buf;
136         int err;
137
138         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
139         if (err < 0)
140                 return err;
141
142         if (on)
143                 buf |= PCF8563_BIT_AIE;
144         else
145                 buf &= ~PCF8563_BIT_AIE;
146
147         buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
148
149         err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
150         if (err < 0) {
151                 dev_err(&client->dev, "%s: write error\n", __func__);
152                 return -EIO;
153         }
154
155         return 0;
156 }
157
158 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
159                                   unsigned char *pen)
160 {
161         unsigned char buf;
162         int err;
163
164         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
165         if (err)
166                 return err;
167
168         if (en)
169                 *en = !!(buf & PCF8563_BIT_AIE);
170         if (pen)
171                 *pen = !!(buf & PCF8563_BIT_AF);
172
173         return 0;
174 }
175
176 static irqreturn_t pcf8563_irq(int irq, void *dev_id)
177 {
178         struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
179         int err;
180         char pending;
181
182         err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
183         if (err)
184                 return IRQ_NONE;
185
186         if (pending) {
187                 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
188                 pcf8563_set_alarm_mode(pcf8563->client, 1);
189                 return IRQ_HANDLED;
190         }
191
192         return IRQ_NONE;
193 }
194
195 /*
196  * In the routines that deal directly with the pcf8563 hardware, we use
197  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
198  */
199 static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
200 {
201         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
202         unsigned char buf[9];
203         int err;
204
205         err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
206         if (err)
207                 return err;
208
209         if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
210                 pcf8563->voltage_low = 1;
211                 dev_err(&client->dev,
212                         "low voltage detected, date/time is not reliable.\n");
213                 return -EINVAL;
214         }
215
216         dev_dbg(&client->dev,
217                 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
218                 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
219                 __func__,
220                 buf[0], buf[1], buf[2], buf[3],
221                 buf[4], buf[5], buf[6], buf[7],
222                 buf[8]);
223
224
225         tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
226         tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
227         tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
228         tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
229         tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
230         tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
231         tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
232         if (tm->tm_year < 70)
233                 tm->tm_year += 100;     /* assume we are in 1970...2069 */
234         /* detect the polarity heuristically. see note above. */
235         pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
236                 (tm->tm_year >= 100) : (tm->tm_year < 100);
237
238         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
239                 "mday=%d, mon=%d, year=%d, wday=%d\n",
240                 __func__,
241                 tm->tm_sec, tm->tm_min, tm->tm_hour,
242                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
243
244         return 0;
245 }
246
247 static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
248 {
249         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
250         unsigned char buf[9];
251
252         dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
253                 "mday=%d, mon=%d, year=%d, wday=%d\n",
254                 __func__,
255                 tm->tm_sec, tm->tm_min, tm->tm_hour,
256                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
257
258         /* hours, minutes and seconds */
259         buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
260         buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
261         buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
262
263         buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
264
265         /* month, 1 - 12 */
266         buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
267
268         /* year and century */
269         buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
270         if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
271                 buf[PCF8563_REG_MO] |= PCF8563_MO_C;
272
273         buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
274
275         return pcf8563_write_block_data(client, PCF8563_REG_SC,
276                                 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
277 }
278
279 #ifdef CONFIG_RTC_INTF_DEV
280 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
281 {
282         struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
283         struct rtc_time tm;
284
285         switch (cmd) {
286         case RTC_VL_READ:
287                 if (pcf8563->voltage_low)
288                         dev_info(dev, "low voltage detected, date/time is not reliable.\n");
289
290                 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
291                                         sizeof(int)))
292                         return -EFAULT;
293                 return 0;
294         case RTC_VL_CLR:
295                 /*
296                  * Clear the VL bit in the seconds register in case
297                  * the time has not been set already (which would
298                  * have cleared it). This does not really matter
299                  * because of the cached voltage_low value but do it
300                  * anyway for consistency.
301                  */
302                 if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
303                         pcf8563_set_datetime(to_i2c_client(dev), &tm);
304
305                 /* Clear the cached value. */
306                 pcf8563->voltage_low = 0;
307
308                 return 0;
309         default:
310                 return -ENOIOCTLCMD;
311         }
312 }
313 #else
314 #define pcf8563_rtc_ioctl NULL
315 #endif
316
317 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
318 {
319         return pcf8563_get_datetime(to_i2c_client(dev), tm);
320 }
321
322 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
323 {
324         return pcf8563_set_datetime(to_i2c_client(dev), tm);
325 }
326
327 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
328 {
329         struct i2c_client *client = to_i2c_client(dev);
330         unsigned char buf[4];
331         int err;
332
333         err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
334         if (err)
335                 return err;
336
337         dev_dbg(&client->dev,
338                 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
339                 __func__, buf[0], buf[1], buf[2], buf[3]);
340
341         tm->time.tm_sec = 0;
342         tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
343         tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
344         tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
345         tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
346
347         err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
348         if (err < 0)
349                 return err;
350
351         dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
352                 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
353                 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
354                 tm->enabled, tm->pending);
355
356         return 0;
357 }
358
359 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
360 {
361         struct i2c_client *client = to_i2c_client(dev);
362         unsigned char buf[4];
363         int err;
364
365         /* The alarm has no seconds, round up to nearest minute */
366         if (tm->time.tm_sec) {
367                 time64_t alarm_time = rtc_tm_to_time64(&tm->time);
368
369                 alarm_time += 60 - tm->time.tm_sec;
370                 rtc_time64_to_tm(alarm_time, &tm->time);
371         }
372
373         dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
374                 "enabled=%d pending=%d\n", __func__,
375                 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
376                 tm->time.tm_mday, tm->enabled, tm->pending);
377
378         buf[0] = bin2bcd(tm->time.tm_min);
379         buf[1] = bin2bcd(tm->time.tm_hour);
380         buf[2] = bin2bcd(tm->time.tm_mday);
381         buf[3] = tm->time.tm_wday & 0x07;
382
383         err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
384         if (err)
385                 return err;
386
387         return pcf8563_set_alarm_mode(client, !!tm->enabled);
388 }
389
390 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
391 {
392         dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
393         return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
394 }
395
396 #ifdef CONFIG_COMMON_CLK
397 /*
398  * Handling of the clkout
399  */
400
401 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw)
402
403 static int clkout_rates[] = {
404         32768,
405         1024,
406         32,
407         1,
408 };
409
410 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw,
411                                                 unsigned long parent_rate)
412 {
413         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
414         struct i2c_client *client = pcf8563->client;
415         unsigned char buf;
416         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
417
418         if (ret < 0)
419                 return 0;
420
421         buf &= PCF8563_REG_CLKO_F_MASK;
422         return clkout_rates[buf];
423 }
424
425 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
426                                       unsigned long *prate)
427 {
428         int i;
429
430         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
431                 if (clkout_rates[i] <= rate)
432                         return clkout_rates[i];
433
434         return 0;
435 }
436
437 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
438                                    unsigned long parent_rate)
439 {
440         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
441         struct i2c_client *client = pcf8563->client;
442         unsigned char buf;
443         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
444         int i;
445
446         if (ret < 0)
447                 return ret;
448
449         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
450                 if (clkout_rates[i] == rate) {
451                         buf &= ~PCF8563_REG_CLKO_F_MASK;
452                         buf |= i;
453                         ret = pcf8563_write_block_data(client,
454                                                        PCF8563_REG_CLKO, 1,
455                                                        &buf);
456                         return ret;
457                 }
458
459         return -EINVAL;
460 }
461
462 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable)
463 {
464         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
465         struct i2c_client *client = pcf8563->client;
466         unsigned char buf;
467         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
468
469         if (ret < 0)
470                 return ret;
471
472         if (enable)
473                 buf |= PCF8563_REG_CLKO_FE;
474         else
475                 buf &= ~PCF8563_REG_CLKO_FE;
476
477         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
478         return ret;
479 }
480
481 static int pcf8563_clkout_prepare(struct clk_hw *hw)
482 {
483         return pcf8563_clkout_control(hw, 1);
484 }
485
486 static void pcf8563_clkout_unprepare(struct clk_hw *hw)
487 {
488         pcf8563_clkout_control(hw, 0);
489 }
490
491 static int pcf8563_clkout_is_prepared(struct clk_hw *hw)
492 {
493         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
494         struct i2c_client *client = pcf8563->client;
495         unsigned char buf;
496         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
497
498         if (ret < 0)
499                 return ret;
500
501         return !!(buf & PCF8563_REG_CLKO_FE);
502 }
503
504 static const struct clk_ops pcf8563_clkout_ops = {
505         .prepare = pcf8563_clkout_prepare,
506         .unprepare = pcf8563_clkout_unprepare,
507         .is_prepared = pcf8563_clkout_is_prepared,
508         .recalc_rate = pcf8563_clkout_recalc_rate,
509         .round_rate = pcf8563_clkout_round_rate,
510         .set_rate = pcf8563_clkout_set_rate,
511 };
512
513 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
514 {
515         struct i2c_client *client = pcf8563->client;
516         struct device_node *node = client->dev.of_node;
517         struct clk *clk;
518         struct clk_init_data init;
519         int ret;
520         unsigned char buf;
521
522         /* disable the clkout output */
523         buf = 0;
524         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
525         if (ret < 0)
526                 return ERR_PTR(ret);
527
528         init.name = "pcf8563-clkout";
529         init.ops = &pcf8563_clkout_ops;
530         init.flags = 0;
531         init.parent_names = NULL;
532         init.num_parents = 0;
533         pcf8563->clkout_hw.init = &init;
534
535         /* optional override of the clockname */
536         of_property_read_string(node, "clock-output-names", &init.name);
537
538         /* register the clock */
539         clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw);
540
541         if (!IS_ERR(clk))
542                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
543
544         return clk;
545 }
546 #endif
547
548 static const struct rtc_class_ops pcf8563_rtc_ops = {
549         .ioctl          = pcf8563_rtc_ioctl,
550         .read_time      = pcf8563_rtc_read_time,
551         .set_time       = pcf8563_rtc_set_time,
552         .read_alarm     = pcf8563_rtc_read_alarm,
553         .set_alarm      = pcf8563_rtc_set_alarm,
554         .alarm_irq_enable = pcf8563_irq_enable,
555 };
556
557 static int pcf8563_probe(struct i2c_client *client,
558                                 const struct i2c_device_id *id)
559 {
560         struct pcf8563 *pcf8563;
561         int err;
562         unsigned char buf;
563
564         dev_dbg(&client->dev, "%s\n", __func__);
565
566         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
567                 return -ENODEV;
568
569         pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
570                                 GFP_KERNEL);
571         if (!pcf8563)
572                 return -ENOMEM;
573
574         i2c_set_clientdata(client, pcf8563);
575         pcf8563->client = client;
576         device_set_wakeup_capable(&client->dev, 1);
577
578         /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
579         buf = PCF8563_TMRC_1_60;
580         err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
581         if (err < 0) {
582                 dev_err(&client->dev, "%s: write error\n", __func__);
583                 return err;
584         }
585
586         /* Clear flags and disable interrupts */
587         buf = 0;
588         err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
589         if (err < 0) {
590                 dev_err(&client->dev, "%s: write error\n", __func__);
591                 return err;
592         }
593
594         pcf8563->rtc = devm_rtc_device_register(&client->dev,
595                                 pcf8563_driver.driver.name,
596                                 &pcf8563_rtc_ops, THIS_MODULE);
597
598         if (IS_ERR(pcf8563->rtc))
599                 return PTR_ERR(pcf8563->rtc);
600
601         if (client->irq > 0) {
602                 err = devm_request_threaded_irq(&client->dev, client->irq,
603                                 NULL, pcf8563_irq,
604                                 IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_LOW,
605                                 pcf8563_driver.driver.name, client);
606                 if (err) {
607                         dev_err(&client->dev, "unable to request IRQ %d\n",
608                                                                 client->irq);
609                         return err;
610                 }
611
612         }
613
614 #ifdef CONFIG_COMMON_CLK
615         /* register clk in common clk framework */
616         pcf8563_clkout_register_clk(pcf8563);
617 #endif
618
619         /* the pcf8563 alarm only supports a minute accuracy */
620         pcf8563->rtc->uie_unsupported = 1;
621
622         return 0;
623 }
624
625 static const struct i2c_device_id pcf8563_id[] = {
626         { "pcf8563", 0 },
627         { "rtc8564", 0 },
628         { }
629 };
630 MODULE_DEVICE_TABLE(i2c, pcf8563_id);
631
632 #ifdef CONFIG_OF
633 static const struct of_device_id pcf8563_of_match[] = {
634         { .compatible = "nxp,pcf8563" },
635         {}
636 };
637 MODULE_DEVICE_TABLE(of, pcf8563_of_match);
638 #endif
639
640 static struct i2c_driver pcf8563_driver = {
641         .driver         = {
642                 .name   = "rtc-pcf8563",
643                 .of_match_table = of_match_ptr(pcf8563_of_match),
644         },
645         .probe          = pcf8563_probe,
646         .id_table       = pcf8563_id,
647 };
648
649 module_i2c_driver(pcf8563_driver);
650
651 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
652 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
653 MODULE_LICENSE("GPL");