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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
dc944368 RJ |
2 | /* |
3 | * Real Time Clock interface for XScale PXA27x and PXA3xx | |
4 | * | |
5 | * Copyright (C) 2008 Robert Jarzmik | |
dc944368 RJ |
6 | */ |
7 | ||
0417ce2a | 8 | #include <linux/init.h> |
dc944368 RJ |
9 | #include <linux/platform_device.h> |
10 | #include <linux/module.h> | |
11 | #include <linux/rtc.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/interrupt.h> | |
0417ce2a | 14 | #include <linux/io.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
9020b7cc | 16 | #include <linux/of.h> |
dc944368 | 17 | |
3cdf4ad9 RH |
18 | #include "rtc-sa1100.h" |
19 | ||
dc944368 RJ |
20 | #define RTC_DEF_DIVIDER (32768 - 1) |
21 | #define RTC_DEF_TRIM 0 | |
22 | #define MAXFREQ_PERIODIC 1000 | |
23 | ||
24 | /* | |
25 | * PXA Registers and bits definitions | |
26 | */ | |
27 | #define RTSR_PICE (1 << 15) /* Periodic interrupt count enable */ | |
28 | #define RTSR_PIALE (1 << 14) /* Periodic interrupt Alarm enable */ | |
29 | #define RTSR_PIAL (1 << 13) /* Periodic interrupt detected */ | |
30 | #define RTSR_SWALE2 (1 << 11) /* RTC stopwatch alarm2 enable */ | |
31 | #define RTSR_SWAL2 (1 << 10) /* RTC stopwatch alarm2 detected */ | |
32 | #define RTSR_SWALE1 (1 << 9) /* RTC stopwatch alarm1 enable */ | |
33 | #define RTSR_SWAL1 (1 << 8) /* RTC stopwatch alarm1 detected */ | |
34 | #define RTSR_RDALE2 (1 << 7) /* RTC alarm2 enable */ | |
35 | #define RTSR_RDAL2 (1 << 6) /* RTC alarm2 detected */ | |
36 | #define RTSR_RDALE1 (1 << 5) /* RTC alarm1 enable */ | |
37 | #define RTSR_RDAL1 (1 << 4) /* RTC alarm1 detected */ | |
38 | #define RTSR_HZE (1 << 3) /* HZ interrupt enable */ | |
39 | #define RTSR_ALE (1 << 2) /* RTC alarm interrupt enable */ | |
40 | #define RTSR_HZ (1 << 1) /* HZ rising-edge detected */ | |
41 | #define RTSR_AL (1 << 0) /* RTC alarm detected */ | |
42 | #define RTSR_TRIG_MASK (RTSR_AL | RTSR_HZ | RTSR_RDAL1 | RTSR_RDAL2\ | |
43 | | RTSR_SWAL1 | RTSR_SWAL2) | |
44 | #define RYxR_YEAR_S 9 | |
45 | #define RYxR_YEAR_MASK (0xfff << RYxR_YEAR_S) | |
46 | #define RYxR_MONTH_S 5 | |
47 | #define RYxR_MONTH_MASK (0xf << RYxR_MONTH_S) | |
48 | #define RYxR_DAY_MASK 0x1f | |
c4243de7 LS |
49 | #define RDxR_WOM_S 20 |
50 | #define RDxR_WOM_MASK (0x7 << RDxR_WOM_S) | |
51 | #define RDxR_DOW_S 17 | |
52 | #define RDxR_DOW_MASK (0x7 << RDxR_DOW_S) | |
dc944368 RJ |
53 | #define RDxR_HOUR_S 12 |
54 | #define RDxR_HOUR_MASK (0x1f << RDxR_HOUR_S) | |
55 | #define RDxR_MIN_S 6 | |
56 | #define RDxR_MIN_MASK (0x3f << RDxR_MIN_S) | |
57 | #define RDxR_SEC_MASK 0x3f | |
58 | ||
59 | #define RTSR 0x08 | |
60 | #define RTTR 0x0c | |
61 | #define RDCR 0x10 | |
62 | #define RYCR 0x14 | |
63 | #define RDAR1 0x18 | |
64 | #define RYAR1 0x1c | |
65 | #define RTCPICR 0x34 | |
66 | #define PIAR 0x38 | |
67 | ||
68 | #define rtc_readl(pxa_rtc, reg) \ | |
69 | __raw_readl((pxa_rtc)->base + (reg)) | |
70 | #define rtc_writel(pxa_rtc, reg, value) \ | |
71 | __raw_writel((value), (pxa_rtc)->base + (reg)) | |
72 | ||
73 | struct pxa_rtc { | |
3cdf4ad9 | 74 | struct sa1100_rtc sa1100_rtc; |
dc944368 RJ |
75 | struct resource *ress; |
76 | void __iomem *base; | |
dc944368 RJ |
77 | struct rtc_device *rtc; |
78 | spinlock_t lock; /* Protects this structure */ | |
dc944368 RJ |
79 | }; |
80 | ||
c4243de7 | 81 | |
dc944368 RJ |
82 | static u32 ryxr_calc(struct rtc_time *tm) |
83 | { | |
84 | return ((tm->tm_year + 1900) << RYxR_YEAR_S) | |
85 | | ((tm->tm_mon + 1) << RYxR_MONTH_S) | |
86 | | tm->tm_mday; | |
87 | } | |
88 | ||
89 | static u32 rdxr_calc(struct rtc_time *tm) | |
90 | { | |
c4243de7 LS |
91 | return ((((tm->tm_mday + 6) / 7) << RDxR_WOM_S) & RDxR_WOM_MASK) |
92 | | (((tm->tm_wday + 1) << RDxR_DOW_S) & RDxR_DOW_MASK) | |
93 | | (tm->tm_hour << RDxR_HOUR_S) | |
94 | | (tm->tm_min << RDxR_MIN_S) | |
dc944368 RJ |
95 | | tm->tm_sec; |
96 | } | |
97 | ||
98 | static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm) | |
99 | { | |
100 | tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900; | |
101 | tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1; | |
102 | tm->tm_mday = (rycr & RYxR_DAY_MASK); | |
c4243de7 | 103 | tm->tm_wday = ((rycr & RDxR_DOW_MASK) >> RDxR_DOW_S) - 1; |
dc944368 RJ |
104 | tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S; |
105 | tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S; | |
106 | tm->tm_sec = rdcr & RDxR_SEC_MASK; | |
107 | } | |
108 | ||
109 | static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask) | |
110 | { | |
111 | u32 rtsr; | |
112 | ||
113 | rtsr = rtc_readl(pxa_rtc, RTSR); | |
114 | rtsr &= ~RTSR_TRIG_MASK; | |
115 | rtsr &= ~mask; | |
116 | rtc_writel(pxa_rtc, RTSR, rtsr); | |
117 | } | |
118 | ||
119 | static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask) | |
120 | { | |
121 | u32 rtsr; | |
122 | ||
123 | rtsr = rtc_readl(pxa_rtc, RTSR); | |
124 | rtsr &= ~RTSR_TRIG_MASK; | |
125 | rtsr |= mask; | |
126 | rtc_writel(pxa_rtc, RTSR, rtsr); | |
127 | } | |
128 | ||
129 | static irqreturn_t pxa_rtc_irq(int irq, void *dev_id) | |
130 | { | |
527bd754 | 131 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev_id); |
dc944368 RJ |
132 | u32 rtsr; |
133 | unsigned long events = 0; | |
134 | ||
135 | spin_lock(&pxa_rtc->lock); | |
136 | ||
137 | /* clear interrupt sources */ | |
138 | rtsr = rtc_readl(pxa_rtc, RTSR); | |
139 | rtc_writel(pxa_rtc, RTSR, rtsr); | |
140 | ||
141 | /* temporary disable rtc interrupts */ | |
142 | rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 | RTSR_PIALE | RTSR_HZE); | |
143 | ||
144 | /* clear alarm interrupt if it has occurred */ | |
145 | if (rtsr & RTSR_RDAL1) | |
146 | rtsr &= ~RTSR_RDALE1; | |
147 | ||
148 | /* update irq data & counter */ | |
149 | if (rtsr & RTSR_RDAL1) | |
150 | events |= RTC_AF | RTC_IRQF; | |
151 | if (rtsr & RTSR_HZ) | |
152 | events |= RTC_UF | RTC_IRQF; | |
153 | if (rtsr & RTSR_PIAL) | |
154 | events |= RTC_PF | RTC_IRQF; | |
155 | ||
156 | rtc_update_irq(pxa_rtc->rtc, 1, events); | |
157 | ||
158 | /* enable back rtc interrupts */ | |
159 | rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK); | |
160 | ||
161 | spin_unlock(&pxa_rtc->lock); | |
162 | return IRQ_HANDLED; | |
163 | } | |
164 | ||
165 | static int pxa_rtc_open(struct device *dev) | |
166 | { | |
167 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
168 | int ret; | |
169 | ||
3cdf4ad9 | 170 | ret = request_irq(pxa_rtc->sa1100_rtc.irq_1hz, pxa_rtc_irq, 0, |
dc944368 RJ |
171 | "rtc 1Hz", dev); |
172 | if (ret < 0) { | |
3cdf4ad9 RH |
173 | dev_err(dev, "can't get irq %i, err %d\n", |
174 | pxa_rtc->sa1100_rtc.irq_1hz, ret); | |
dc944368 RJ |
175 | goto err_irq_1Hz; |
176 | } | |
3cdf4ad9 | 177 | ret = request_irq(pxa_rtc->sa1100_rtc.irq_alarm, pxa_rtc_irq, 0, |
dc944368 RJ |
178 | "rtc Alrm", dev); |
179 | if (ret < 0) { | |
3cdf4ad9 RH |
180 | dev_err(dev, "can't get irq %i, err %d\n", |
181 | pxa_rtc->sa1100_rtc.irq_alarm, ret); | |
dc944368 RJ |
182 | goto err_irq_Alrm; |
183 | } | |
184 | ||
185 | return 0; | |
186 | ||
187 | err_irq_Alrm: | |
3cdf4ad9 | 188 | free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev); |
dc944368 RJ |
189 | err_irq_1Hz: |
190 | return ret; | |
191 | } | |
192 | ||
193 | static void pxa_rtc_release(struct device *dev) | |
194 | { | |
195 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
196 | ||
197 | spin_lock_irq(&pxa_rtc->lock); | |
198 | rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE); | |
199 | spin_unlock_irq(&pxa_rtc->lock); | |
200 | ||
3cdf4ad9 RH |
201 | free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev); |
202 | free_irq(pxa_rtc->sa1100_rtc.irq_alarm, dev); | |
dc944368 RJ |
203 | } |
204 | ||
93b1384f | 205 | static int pxa_alarm_irq_enable(struct device *dev, unsigned int enabled) |
dc944368 RJ |
206 | { |
207 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
dc944368 RJ |
208 | |
209 | spin_lock_irq(&pxa_rtc->lock); | |
93b1384f WZ |
210 | |
211 | if (enabled) | |
dc944368 | 212 | rtsr_set_bits(pxa_rtc, RTSR_RDALE1); |
93b1384f WZ |
213 | else |
214 | rtsr_clear_bits(pxa_rtc, RTSR_RDALE1); | |
215 | ||
216 | spin_unlock_irq(&pxa_rtc->lock); | |
217 | return 0; | |
218 | } | |
219 | ||
dc944368 RJ |
220 | static int pxa_rtc_read_time(struct device *dev, struct rtc_time *tm) |
221 | { | |
222 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
223 | u32 rycr, rdcr; | |
224 | ||
225 | rycr = rtc_readl(pxa_rtc, RYCR); | |
226 | rdcr = rtc_readl(pxa_rtc, RDCR); | |
227 | ||
228 | tm_calc(rycr, rdcr, tm); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
233 | { | |
234 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
235 | ||
236 | rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm)); | |
237 | rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm)); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int pxa_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
243 | { | |
244 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
245 | u32 rtsr, ryar, rdar; | |
246 | ||
247 | ryar = rtc_readl(pxa_rtc, RYAR1); | |
248 | rdar = rtc_readl(pxa_rtc, RDAR1); | |
249 | tm_calc(ryar, rdar, &alrm->time); | |
250 | ||
251 | rtsr = rtc_readl(pxa_rtc, RTSR); | |
252 | alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0; | |
253 | alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static int pxa_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
258 | { | |
259 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
260 | u32 rtsr; | |
261 | ||
262 | spin_lock_irq(&pxa_rtc->lock); | |
263 | ||
264 | rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time)); | |
265 | rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time)); | |
266 | ||
267 | rtsr = rtc_readl(pxa_rtc, RTSR); | |
268 | if (alrm->enabled) | |
269 | rtsr |= RTSR_RDALE1; | |
270 | else | |
271 | rtsr &= ~RTSR_RDALE1; | |
272 | rtc_writel(pxa_rtc, RTSR, rtsr); | |
273 | ||
274 | spin_unlock_irq(&pxa_rtc->lock); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static int pxa_rtc_proc(struct device *dev, struct seq_file *seq) | |
280 | { | |
281 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); | |
282 | ||
283 | seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR)); | |
284 | seq_printf(seq, "update_IRQ\t: %s\n", | |
285 | (rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no"); | |
286 | seq_printf(seq, "periodic_IRQ\t: %s\n", | |
287 | (rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no"); | |
288 | seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR)); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static const struct rtc_class_ops pxa_rtc_ops = { | |
dc944368 RJ |
294 | .read_time = pxa_rtc_read_time, |
295 | .set_time = pxa_rtc_set_time, | |
296 | .read_alarm = pxa_rtc_read_alarm, | |
297 | .set_alarm = pxa_rtc_set_alarm, | |
93b1384f | 298 | .alarm_irq_enable = pxa_alarm_irq_enable, |
dc944368 | 299 | .proc = pxa_rtc_proc, |
dc944368 RJ |
300 | }; |
301 | ||
0417ce2a | 302 | static int __init pxa_rtc_probe(struct platform_device *pdev) |
dc944368 RJ |
303 | { |
304 | struct device *dev = &pdev->dev; | |
305 | struct pxa_rtc *pxa_rtc; | |
3cdf4ad9 | 306 | struct sa1100_rtc *sa1100_rtc; |
dc944368 | 307 | int ret; |
dc944368 | 308 | |
618c3003 | 309 | pxa_rtc = devm_kzalloc(dev, sizeof(*pxa_rtc), GFP_KERNEL); |
dc944368 | 310 | if (!pxa_rtc) |
0417ce2a | 311 | return -ENOMEM; |
3cdf4ad9 | 312 | sa1100_rtc = &pxa_rtc->sa1100_rtc; |
0417ce2a AZ |
313 | |
314 | spin_lock_init(&pxa_rtc->lock); | |
315 | platform_set_drvdata(pdev, pxa_rtc); | |
dc944368 | 316 | |
dc944368 RJ |
317 | pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
318 | if (!pxa_rtc->ress) { | |
319 | dev_err(dev, "No I/O memory resource defined\n"); | |
618c3003 | 320 | return -ENXIO; |
dc944368 RJ |
321 | } |
322 | ||
3cdf4ad9 | 323 | sa1100_rtc->irq_1hz = platform_get_irq(pdev, 0); |
faac9102 | 324 | if (sa1100_rtc->irq_1hz < 0) |
618c3003 | 325 | return -ENXIO; |
3cdf4ad9 | 326 | sa1100_rtc->irq_alarm = platform_get_irq(pdev, 1); |
faac9102 | 327 | if (sa1100_rtc->irq_alarm < 0) |
618c3003 | 328 | return -ENXIO; |
56c0c529 | 329 | |
34127b36 LB |
330 | sa1100_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
331 | if (IS_ERR(sa1100_rtc->rtc)) | |
332 | return PTR_ERR(sa1100_rtc->rtc); | |
333 | ||
618c3003 | 334 | pxa_rtc->base = devm_ioremap(dev, pxa_rtc->ress->start, |
0417ce2a | 335 | resource_size(pxa_rtc->ress)); |
dc944368 | 336 | if (!pxa_rtc->base) { |
618c3003 JH |
337 | dev_err(dev, "Unable to map pxa RTC I/O memory\n"); |
338 | return -ENOMEM; | |
dc944368 RJ |
339 | } |
340 | ||
56c0c529 AB |
341 | pxa_rtc_open(dev); |
342 | ||
90d0ae8e RH |
343 | sa1100_rtc->rcnr = pxa_rtc->base + 0x0; |
344 | sa1100_rtc->rtsr = pxa_rtc->base + 0x8; | |
345 | sa1100_rtc->rtar = pxa_rtc->base + 0x4; | |
346 | sa1100_rtc->rttr = pxa_rtc->base + 0xc; | |
3cdf4ad9 | 347 | ret = sa1100_rtc_init(pdev, sa1100_rtc); |
e4302aec | 348 | if (ret) { |
3cdf4ad9 RH |
349 | dev_err(dev, "Unable to init SA1100 RTC sub-device\n"); |
350 | return ret; | |
dc944368 RJ |
351 | } |
352 | ||
353 | rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE); | |
0417ce2a | 354 | |
618c3003 JH |
355 | pxa_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pxa-rtc", |
356 | &pxa_rtc_ops, THIS_MODULE); | |
0417ce2a | 357 | if (IS_ERR(pxa_rtc->rtc)) { |
618c3003 | 358 | ret = PTR_ERR(pxa_rtc->rtc); |
0417ce2a | 359 | dev_err(dev, "Failed to register RTC device -> %d\n", ret); |
618c3003 | 360 | return ret; |
0417ce2a AZ |
361 | } |
362 | ||
dc944368 RJ |
363 | device_init_wakeup(dev, 1); |
364 | ||
365 | return 0; | |
dc944368 RJ |
366 | } |
367 | ||
e288cfe8 | 368 | static void __exit pxa_rtc_remove(struct platform_device *pdev) |
dc944368 | 369 | { |
a44802f8 | 370 | struct device *dev = &pdev->dev; |
dc944368 | 371 | |
618c3003 | 372 | pxa_rtc_release(dev); |
dc944368 RJ |
373 | } |
374 | ||
9020b7cc | 375 | #ifdef CONFIG_OF |
8b18daa1 | 376 | static const struct of_device_id pxa_rtc_dt_ids[] = { |
9020b7cc DM |
377 | { .compatible = "marvell,pxa-rtc" }, |
378 | {} | |
379 | }; | |
380 | MODULE_DEVICE_TABLE(of, pxa_rtc_dt_ids); | |
381 | #endif | |
382 | ||
c5a40618 | 383 | #ifdef CONFIG_PM_SLEEP |
e6e698a4 | 384 | static int pxa_rtc_suspend(struct device *dev) |
dc944368 | 385 | { |
e6e698a4 | 386 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); |
dc944368 | 387 | |
e6e698a4 | 388 | if (device_may_wakeup(dev)) |
3cdf4ad9 | 389 | enable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm); |
dc944368 RJ |
390 | return 0; |
391 | } | |
392 | ||
e6e698a4 | 393 | static int pxa_rtc_resume(struct device *dev) |
dc944368 | 394 | { |
e6e698a4 | 395 | struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); |
dc944368 | 396 | |
e6e698a4 | 397 | if (device_may_wakeup(dev)) |
3cdf4ad9 | 398 | disable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm); |
dc944368 RJ |
399 | return 0; |
400 | } | |
dc944368 RJ |
401 | #endif |
402 | ||
c5a40618 JH |
403 | static SIMPLE_DEV_PM_OPS(pxa_rtc_pm_ops, pxa_rtc_suspend, pxa_rtc_resume); |
404 | ||
47712bc2 UKK |
405 | /* |
406 | * pxa_rtc_remove() lives in .exit.text. For drivers registered via | |
407 | * module_platform_driver_probe() this is ok because they cannot get unbound at | |
408 | * runtime. So mark the driver struct with __refdata to prevent modpost | |
409 | * triggering a section mismatch warning. | |
410 | */ | |
411 | static struct platform_driver pxa_rtc_driver __refdata = { | |
e288cfe8 | 412 | .remove_new = __exit_p(pxa_rtc_remove), |
dc944368 | 413 | .driver = { |
e6e698a4 | 414 | .name = "pxa-rtc", |
9020b7cc | 415 | .of_match_table = of_match_ptr(pxa_rtc_dt_ids), |
e6e698a4 | 416 | .pm = &pxa_rtc_pm_ops, |
dc944368 RJ |
417 | }, |
418 | }; | |
419 | ||
7daba88e | 420 | module_platform_driver_probe(pxa_rtc_driver, pxa_rtc_probe); |
dc944368 | 421 | |
57f63bc8 | 422 | MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); |
dc944368 RJ |
423 | MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)"); |
424 | MODULE_LICENSE("GPL"); | |
425 | MODULE_ALIAS("platform:pxa-rtc"); |