1 /* 2 * RTC Driver for X-Powers AC100 3 * 4 * Copyright (c) 2016 Chen-Yu Tsai 5 * 6 * Chen-Yu Tsai <wens@csie.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 */ 17 18 #include <linux/bcd.h> 19 #include <linux/clk-provider.h> 20 #include <linux/device.h> 21 #include <linux/interrupt.h> 22 #include <linux/kernel.h> 23 #include <linux/mfd/ac100.h> 24 #include <linux/module.h> 25 #include <linux/mutex.h> 26 #include <linux/of.h> 27 #include <linux/platform_device.h> 28 #include <linux/regmap.h> 29 #include <linux/rtc.h> 30 #include <linux/types.h> 31 32 /* Control register */ 33 #define AC100_RTC_CTRL_24HOUR BIT(0) 34 35 /* Clock output register bits */ 36 #define AC100_CLKOUT_PRE_DIV_SHIFT 5 37 #define AC100_CLKOUT_PRE_DIV_WIDTH 3 38 #define AC100_CLKOUT_MUX_SHIFT 4 39 #define AC100_CLKOUT_MUX_WIDTH 1 40 #define AC100_CLKOUT_DIV_SHIFT 1 41 #define AC100_CLKOUT_DIV_WIDTH 3 42 #define AC100_CLKOUT_EN BIT(0) 43 44 /* RTC */ 45 #define AC100_RTC_SEC_MASK GENMASK(6, 0) 46 #define AC100_RTC_MIN_MASK GENMASK(6, 0) 47 #define AC100_RTC_HOU_MASK GENMASK(5, 0) 48 #define AC100_RTC_WEE_MASK GENMASK(2, 0) 49 #define AC100_RTC_DAY_MASK GENMASK(5, 0) 50 #define AC100_RTC_MON_MASK GENMASK(4, 0) 51 #define AC100_RTC_YEA_MASK GENMASK(7, 0) 52 #define AC100_RTC_YEA_LEAP BIT(15) 53 #define AC100_RTC_UPD_TRIGGER BIT(15) 54 55 /* Alarm (wall clock) */ 56 #define AC100_ALM_INT_ENABLE BIT(0) 57 58 #define AC100_ALM_SEC_MASK GENMASK(6, 0) 59 #define AC100_ALM_MIN_MASK GENMASK(6, 0) 60 #define AC100_ALM_HOU_MASK GENMASK(5, 0) 61 #define AC100_ALM_WEE_MASK GENMASK(2, 0) 62 #define AC100_ALM_DAY_MASK GENMASK(5, 0) 63 #define AC100_ALM_MON_MASK GENMASK(4, 0) 64 #define AC100_ALM_YEA_MASK GENMASK(7, 0) 65 #define AC100_ALM_ENABLE_FLAG BIT(15) 66 #define AC100_ALM_UPD_TRIGGER BIT(15) 67 68 /* 69 * The year parameter passed to the driver is usually an offset relative to 70 * the year 1900. This macro is used to convert this offset to another one 71 * relative to the minimum year allowed by the hardware. 72 * 73 * The year range is 1970 - 2069. This range is selected to match Allwinner's 74 * driver. 75 */ 76 #define AC100_YEAR_MIN 1970 77 #define AC100_YEAR_MAX 2069 78 #define AC100_YEAR_OFF (AC100_YEAR_MIN - 1900) 79 80 struct ac100_clkout { 81 struct clk_hw hw; 82 struct regmap *regmap; 83 u8 offset; 84 }; 85 86 #define to_ac100_clkout(_hw) container_of(_hw, struct ac100_clkout, hw) 87 88 #define AC100_RTC_32K_NAME "ac100-rtc-32k" 89 #define AC100_RTC_32K_RATE 32768 90 #define AC100_CLKOUT_NUM 3 91 92 static const char * const ac100_clkout_names[AC100_CLKOUT_NUM] = { 93 "ac100-cko1-rtc", 94 "ac100-cko2-rtc", 95 "ac100-cko3-rtc", 96 }; 97 98 struct ac100_rtc_dev { 99 struct rtc_device *rtc; 100 struct device *dev; 101 struct regmap *regmap; 102 int irq; 103 unsigned long alarm; 104 105 struct clk_hw *rtc_32k_clk; 106 struct ac100_clkout clks[AC100_CLKOUT_NUM]; 107 struct clk_hw_onecell_data *clk_data; 108 }; 109 110 /** 111 * Clock controls for 3 clock output pins 112 */ 113 114 static const struct clk_div_table ac100_clkout_prediv[] = { 115 { .val = 0, .div = 1 }, 116 { .val = 1, .div = 2 }, 117 { .val = 2, .div = 4 }, 118 { .val = 3, .div = 8 }, 119 { .val = 4, .div = 16 }, 120 { .val = 5, .div = 32 }, 121 { .val = 6, .div = 64 }, 122 { .val = 7, .div = 122 }, 123 { }, 124 }; 125 126 /* Abuse the fact that one parent is 32768 Hz, and the other is 4 MHz */ 127 static unsigned long ac100_clkout_recalc_rate(struct clk_hw *hw, 128 unsigned long prate) 129 { 130 struct ac100_clkout *clk = to_ac100_clkout(hw); 131 unsigned int reg, div; 132 133 regmap_read(clk->regmap, clk->offset, ®); 134 135 /* Handle pre-divider first */ 136 if (prate != AC100_RTC_32K_RATE) { 137 div = (reg >> AC100_CLKOUT_PRE_DIV_SHIFT) & 138 ((1 << AC100_CLKOUT_PRE_DIV_WIDTH) - 1); 139 prate = divider_recalc_rate(hw, prate, div, 140 ac100_clkout_prediv, 0); 141 } 142 143 div = (reg >> AC100_CLKOUT_DIV_SHIFT) & 144 (BIT(AC100_CLKOUT_DIV_WIDTH) - 1); 145 return divider_recalc_rate(hw, prate, div, NULL, 146 CLK_DIVIDER_POWER_OF_TWO); 147 } 148 149 static long ac100_clkout_round_rate(struct clk_hw *hw, unsigned long rate, 150 unsigned long prate) 151 { 152 unsigned long best_rate = 0, tmp_rate, tmp_prate; 153 int i; 154 155 if (prate == AC100_RTC_32K_RATE) 156 return divider_round_rate(hw, rate, &prate, NULL, 157 AC100_CLKOUT_DIV_WIDTH, 158 CLK_DIVIDER_POWER_OF_TWO); 159 160 for (i = 0; ac100_clkout_prediv[i].div; i++) { 161 tmp_prate = DIV_ROUND_UP(prate, ac100_clkout_prediv[i].val); 162 tmp_rate = divider_round_rate(hw, rate, &tmp_prate, NULL, 163 AC100_CLKOUT_DIV_WIDTH, 164 CLK_DIVIDER_POWER_OF_TWO); 165 166 if (tmp_rate > rate) 167 continue; 168 if (rate - tmp_rate < best_rate - tmp_rate) 169 best_rate = tmp_rate; 170 } 171 172 return best_rate; 173 } 174 175 static int ac100_clkout_determine_rate(struct clk_hw *hw, 176 struct clk_rate_request *req) 177 { 178 struct clk_hw *best_parent; 179 unsigned long best = 0; 180 int i, num_parents = clk_hw_get_num_parents(hw); 181 182 for (i = 0; i < num_parents; i++) { 183 struct clk_hw *parent = clk_hw_get_parent_by_index(hw, i); 184 unsigned long tmp, prate = clk_hw_get_rate(parent); 185 186 tmp = ac100_clkout_round_rate(hw, req->rate, prate); 187 188 if (tmp > req->rate) 189 continue; 190 if (req->rate - tmp < req->rate - best) { 191 best = tmp; 192 best_parent = parent; 193 } 194 } 195 196 if (!best) 197 return -EINVAL; 198 199 req->best_parent_hw = best_parent; 200 req->best_parent_rate = best; 201 req->rate = best; 202 203 return 0; 204 } 205 206 static int ac100_clkout_set_rate(struct clk_hw *hw, unsigned long rate, 207 unsigned long prate) 208 { 209 struct ac100_clkout *clk = to_ac100_clkout(hw); 210 int div = 0, pre_div = 0; 211 212 do { 213 div = divider_get_val(rate * ac100_clkout_prediv[pre_div].div, 214 prate, NULL, AC100_CLKOUT_DIV_WIDTH, 215 CLK_DIVIDER_POWER_OF_TWO); 216 if (div >= 0) 217 break; 218 } while (prate != AC100_RTC_32K_RATE && 219 ac100_clkout_prediv[++pre_div].div); 220 221 if (div < 0) 222 return div; 223 224 pre_div = ac100_clkout_prediv[pre_div].val; 225 226 regmap_update_bits(clk->regmap, clk->offset, 227 ((1 << AC100_CLKOUT_DIV_WIDTH) - 1) << AC100_CLKOUT_DIV_SHIFT | 228 ((1 << AC100_CLKOUT_PRE_DIV_WIDTH) - 1) << AC100_CLKOUT_PRE_DIV_SHIFT, 229 (div - 1) << AC100_CLKOUT_DIV_SHIFT | 230 (pre_div - 1) << AC100_CLKOUT_PRE_DIV_SHIFT); 231 232 return 0; 233 } 234 235 static int ac100_clkout_prepare(struct clk_hw *hw) 236 { 237 struct ac100_clkout *clk = to_ac100_clkout(hw); 238 239 return regmap_update_bits(clk->regmap, clk->offset, AC100_CLKOUT_EN, 240 AC100_CLKOUT_EN); 241 } 242 243 static void ac100_clkout_unprepare(struct clk_hw *hw) 244 { 245 struct ac100_clkout *clk = to_ac100_clkout(hw); 246 247 regmap_update_bits(clk->regmap, clk->offset, AC100_CLKOUT_EN, 0); 248 } 249 250 static int ac100_clkout_is_prepared(struct clk_hw *hw) 251 { 252 struct ac100_clkout *clk = to_ac100_clkout(hw); 253 unsigned int reg; 254 255 regmap_read(clk->regmap, clk->offset, ®); 256 257 return reg & AC100_CLKOUT_EN; 258 } 259 260 static u8 ac100_clkout_get_parent(struct clk_hw *hw) 261 { 262 struct ac100_clkout *clk = to_ac100_clkout(hw); 263 unsigned int reg; 264 265 regmap_read(clk->regmap, clk->offset, ®); 266 267 return (reg >> AC100_CLKOUT_MUX_SHIFT) & 0x1; 268 } 269 270 static int ac100_clkout_set_parent(struct clk_hw *hw, u8 index) 271 { 272 struct ac100_clkout *clk = to_ac100_clkout(hw); 273 274 return regmap_update_bits(clk->regmap, clk->offset, 275 BIT(AC100_CLKOUT_MUX_SHIFT), 276 index ? BIT(AC100_CLKOUT_MUX_SHIFT) : 0); 277 } 278 279 static const struct clk_ops ac100_clkout_ops = { 280 .prepare = ac100_clkout_prepare, 281 .unprepare = ac100_clkout_unprepare, 282 .is_prepared = ac100_clkout_is_prepared, 283 .recalc_rate = ac100_clkout_recalc_rate, 284 .determine_rate = ac100_clkout_determine_rate, 285 .get_parent = ac100_clkout_get_parent, 286 .set_parent = ac100_clkout_set_parent, 287 .set_rate = ac100_clkout_set_rate, 288 }; 289 290 static int ac100_rtc_register_clks(struct ac100_rtc_dev *chip) 291 { 292 struct device_node *np = chip->dev->of_node; 293 const char *parents[2] = {AC100_RTC_32K_NAME}; 294 int i, ret; 295 296 chip->clk_data = devm_kzalloc(chip->dev, sizeof(*chip->clk_data) + 297 sizeof(*chip->clk_data->hws) * 298 AC100_CLKOUT_NUM, 299 GFP_KERNEL); 300 if (!chip->clk_data) 301 return -ENOMEM; 302 303 chip->rtc_32k_clk = clk_hw_register_fixed_rate(chip->dev, 304 AC100_RTC_32K_NAME, 305 NULL, 0, 306 AC100_RTC_32K_RATE); 307 if (IS_ERR(chip->rtc_32k_clk)) { 308 ret = PTR_ERR(chip->rtc_32k_clk); 309 dev_err(chip->dev, "Failed to register RTC-32k clock: %d\n", 310 ret); 311 return ret; 312 } 313 314 parents[1] = of_clk_get_parent_name(np, 0); 315 if (!parents[1]) { 316 dev_err(chip->dev, "Failed to get ADDA 4M clock\n"); 317 return -EINVAL; 318 } 319 320 for (i = 0; i < AC100_CLKOUT_NUM; i++) { 321 struct ac100_clkout *clk = &chip->clks[i]; 322 struct clk_init_data init = { 323 .name = ac100_clkout_names[i], 324 .ops = &ac100_clkout_ops, 325 .parent_names = parents, 326 .num_parents = ARRAY_SIZE(parents), 327 .flags = 0, 328 }; 329 330 of_property_read_string_index(np, "clock-output-names", 331 i, &init.name); 332 clk->regmap = chip->regmap; 333 clk->offset = AC100_CLKOUT_CTRL1 + i; 334 clk->hw.init = &init; 335 336 ret = devm_clk_hw_register(chip->dev, &clk->hw); 337 if (ret) { 338 dev_err(chip->dev, "Failed to register clk '%s': %d\n", 339 init.name, ret); 340 goto err_unregister_rtc_32k; 341 } 342 343 chip->clk_data->hws[i] = &clk->hw; 344 } 345 346 chip->clk_data->num = i; 347 ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, chip->clk_data); 348 if (ret) 349 goto err_unregister_rtc_32k; 350 351 return 0; 352 353 err_unregister_rtc_32k: 354 clk_unregister_fixed_rate(chip->rtc_32k_clk->clk); 355 356 return ret; 357 } 358 359 static void ac100_rtc_unregister_clks(struct ac100_rtc_dev *chip) 360 { 361 of_clk_del_provider(chip->dev->of_node); 362 clk_unregister_fixed_rate(chip->rtc_32k_clk->clk); 363 } 364 365 /** 366 * RTC related bits 367 */ 368 static int ac100_rtc_get_time(struct device *dev, struct rtc_time *rtc_tm) 369 { 370 struct ac100_rtc_dev *chip = dev_get_drvdata(dev); 371 struct regmap *regmap = chip->regmap; 372 u16 reg[7]; 373 int ret; 374 375 ret = regmap_bulk_read(regmap, AC100_RTC_SEC, reg, 7); 376 if (ret) 377 return ret; 378 379 rtc_tm->tm_sec = bcd2bin(reg[0] & AC100_RTC_SEC_MASK); 380 rtc_tm->tm_min = bcd2bin(reg[1] & AC100_RTC_MIN_MASK); 381 rtc_tm->tm_hour = bcd2bin(reg[2] & AC100_RTC_HOU_MASK); 382 rtc_tm->tm_wday = bcd2bin(reg[3] & AC100_RTC_WEE_MASK); 383 rtc_tm->tm_mday = bcd2bin(reg[4] & AC100_RTC_DAY_MASK); 384 rtc_tm->tm_mon = bcd2bin(reg[5] & AC100_RTC_MON_MASK) - 1; 385 rtc_tm->tm_year = bcd2bin(reg[6] & AC100_RTC_YEA_MASK) + 386 AC100_YEAR_OFF; 387 388 return rtc_valid_tm(rtc_tm); 389 } 390 391 static int ac100_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm) 392 { 393 struct ac100_rtc_dev *chip = dev_get_drvdata(dev); 394 struct regmap *regmap = chip->regmap; 395 int year; 396 u16 reg[8]; 397 398 /* our RTC has a limited year range... */ 399 year = rtc_tm->tm_year - AC100_YEAR_OFF; 400 if (year < 0 || year > (AC100_YEAR_MAX - 1900)) { 401 dev_err(dev, "rtc only supports year in range %d - %d\n", 402 AC100_YEAR_MIN, AC100_YEAR_MAX); 403 return -EINVAL; 404 } 405 406 /* convert to BCD */ 407 reg[0] = bin2bcd(rtc_tm->tm_sec) & AC100_RTC_SEC_MASK; 408 reg[1] = bin2bcd(rtc_tm->tm_min) & AC100_RTC_MIN_MASK; 409 reg[2] = bin2bcd(rtc_tm->tm_hour) & AC100_RTC_HOU_MASK; 410 reg[3] = bin2bcd(rtc_tm->tm_wday) & AC100_RTC_WEE_MASK; 411 reg[4] = bin2bcd(rtc_tm->tm_mday) & AC100_RTC_DAY_MASK; 412 reg[5] = bin2bcd(rtc_tm->tm_mon + 1) & AC100_RTC_MON_MASK; 413 reg[6] = bin2bcd(year) & AC100_RTC_YEA_MASK; 414 /* trigger write */ 415 reg[7] = AC100_RTC_UPD_TRIGGER; 416 417 /* Is it a leap year? */ 418 if (is_leap_year(year + AC100_YEAR_OFF + 1900)) 419 reg[6] |= AC100_RTC_YEA_LEAP; 420 421 return regmap_bulk_write(regmap, AC100_RTC_SEC, reg, 8); 422 } 423 424 static int ac100_rtc_alarm_irq_enable(struct device *dev, unsigned int en) 425 { 426 struct ac100_rtc_dev *chip = dev_get_drvdata(dev); 427 struct regmap *regmap = chip->regmap; 428 unsigned int val; 429 430 val = en ? AC100_ALM_INT_ENABLE : 0; 431 432 return regmap_write(regmap, AC100_ALM_INT_ENA, val); 433 } 434 435 static int ac100_rtc_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) 436 { 437 struct ac100_rtc_dev *chip = dev_get_drvdata(dev); 438 struct regmap *regmap = chip->regmap; 439 struct rtc_time *alrm_tm = &alrm->time; 440 u16 reg[7]; 441 unsigned int val; 442 int ret; 443 444 ret = regmap_read(regmap, AC100_ALM_INT_ENA, &val); 445 if (ret) 446 return ret; 447 448 alrm->enabled = !!(val & AC100_ALM_INT_ENABLE); 449 450 ret = regmap_bulk_read(regmap, AC100_ALM_SEC, reg, 7); 451 if (ret) 452 return ret; 453 454 alrm_tm->tm_sec = bcd2bin(reg[0] & AC100_ALM_SEC_MASK); 455 alrm_tm->tm_min = bcd2bin(reg[1] & AC100_ALM_MIN_MASK); 456 alrm_tm->tm_hour = bcd2bin(reg[2] & AC100_ALM_HOU_MASK); 457 alrm_tm->tm_wday = bcd2bin(reg[3] & AC100_ALM_WEE_MASK); 458 alrm_tm->tm_mday = bcd2bin(reg[4] & AC100_ALM_DAY_MASK); 459 alrm_tm->tm_mon = bcd2bin(reg[5] & AC100_ALM_MON_MASK) - 1; 460 alrm_tm->tm_year = bcd2bin(reg[6] & AC100_ALM_YEA_MASK) + 461 AC100_YEAR_OFF; 462 463 return 0; 464 } 465 466 static int ac100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 467 { 468 struct ac100_rtc_dev *chip = dev_get_drvdata(dev); 469 struct regmap *regmap = chip->regmap; 470 struct rtc_time *alrm_tm = &alrm->time; 471 u16 reg[8]; 472 int year; 473 int ret; 474 475 /* our alarm has a limited year range... */ 476 year = alrm_tm->tm_year - AC100_YEAR_OFF; 477 if (year < 0 || year > (AC100_YEAR_MAX - 1900)) { 478 dev_err(dev, "alarm only supports year in range %d - %d\n", 479 AC100_YEAR_MIN, AC100_YEAR_MAX); 480 return -EINVAL; 481 } 482 483 /* convert to BCD */ 484 reg[0] = (bin2bcd(alrm_tm->tm_sec) & AC100_ALM_SEC_MASK) | 485 AC100_ALM_ENABLE_FLAG; 486 reg[1] = (bin2bcd(alrm_tm->tm_min) & AC100_ALM_MIN_MASK) | 487 AC100_ALM_ENABLE_FLAG; 488 reg[2] = (bin2bcd(alrm_tm->tm_hour) & AC100_ALM_HOU_MASK) | 489 AC100_ALM_ENABLE_FLAG; 490 /* Do not enable weekday alarm */ 491 reg[3] = bin2bcd(alrm_tm->tm_wday) & AC100_ALM_WEE_MASK; 492 reg[4] = (bin2bcd(alrm_tm->tm_mday) & AC100_ALM_DAY_MASK) | 493 AC100_ALM_ENABLE_FLAG; 494 reg[5] = (bin2bcd(alrm_tm->tm_mon + 1) & AC100_ALM_MON_MASK) | 495 AC100_ALM_ENABLE_FLAG; 496 reg[6] = (bin2bcd(year) & AC100_ALM_YEA_MASK) | 497 AC100_ALM_ENABLE_FLAG; 498 /* trigger write */ 499 reg[7] = AC100_ALM_UPD_TRIGGER; 500 501 ret = regmap_bulk_write(regmap, AC100_ALM_SEC, reg, 8); 502 if (ret) 503 return ret; 504 505 return ac100_rtc_alarm_irq_enable(dev, alrm->enabled); 506 } 507 508 static irqreturn_t ac100_rtc_irq(int irq, void *data) 509 { 510 struct ac100_rtc_dev *chip = data; 511 struct regmap *regmap = chip->regmap; 512 unsigned int val = 0; 513 int ret; 514 515 mutex_lock(&chip->rtc->ops_lock); 516 517 /* read status */ 518 ret = regmap_read(regmap, AC100_ALM_INT_STA, &val); 519 if (ret) 520 goto out; 521 522 if (val & AC100_ALM_INT_ENABLE) { 523 /* signal rtc framework */ 524 rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF); 525 526 /* clear status */ 527 ret = regmap_write(regmap, AC100_ALM_INT_STA, val); 528 if (ret) 529 goto out; 530 531 /* disable interrupt */ 532 ret = ac100_rtc_alarm_irq_enable(chip->dev, 0); 533 if (ret) 534 goto out; 535 } 536 537 out: 538 mutex_unlock(&chip->rtc->ops_lock); 539 return IRQ_HANDLED; 540 } 541 542 static const struct rtc_class_ops ac100_rtc_ops = { 543 .read_time = ac100_rtc_get_time, 544 .set_time = ac100_rtc_set_time, 545 .read_alarm = ac100_rtc_get_alarm, 546 .set_alarm = ac100_rtc_set_alarm, 547 .alarm_irq_enable = ac100_rtc_alarm_irq_enable, 548 }; 549 550 static int ac100_rtc_probe(struct platform_device *pdev) 551 { 552 struct ac100_dev *ac100 = dev_get_drvdata(pdev->dev.parent); 553 struct ac100_rtc_dev *chip; 554 int ret; 555 556 chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); 557 if (!chip) 558 return -ENOMEM; 559 560 platform_set_drvdata(pdev, chip); 561 chip->dev = &pdev->dev; 562 chip->regmap = ac100->regmap; 563 564 chip->irq = platform_get_irq(pdev, 0); 565 if (chip->irq < 0) { 566 dev_err(&pdev->dev, "No IRQ resource\n"); 567 return chip->irq; 568 } 569 570 ret = devm_request_threaded_irq(&pdev->dev, chip->irq, NULL, 571 ac100_rtc_irq, 572 IRQF_SHARED | IRQF_ONESHOT, 573 dev_name(&pdev->dev), chip); 574 if (ret) { 575 dev_err(&pdev->dev, "Could not request IRQ\n"); 576 return ret; 577 } 578 579 /* always use 24 hour mode */ 580 regmap_write_bits(chip->regmap, AC100_RTC_CTRL, AC100_RTC_CTRL_24HOUR, 581 AC100_RTC_CTRL_24HOUR); 582 583 /* disable counter alarm interrupt */ 584 regmap_write(chip->regmap, AC100_ALM_INT_ENA, 0); 585 586 /* clear counter alarm pending interrupts */ 587 regmap_write(chip->regmap, AC100_ALM_INT_STA, AC100_ALM_INT_ENABLE); 588 589 chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-ac100", 590 &ac100_rtc_ops, THIS_MODULE); 591 if (IS_ERR(chip->rtc)) { 592 dev_err(&pdev->dev, "unable to register device\n"); 593 return PTR_ERR(chip->rtc); 594 } 595 596 ret = ac100_rtc_register_clks(chip); 597 if (ret) 598 return ret; 599 600 dev_info(&pdev->dev, "RTC enabled\n"); 601 602 return 0; 603 } 604 605 static int ac100_rtc_remove(struct platform_device *pdev) 606 { 607 struct ac100_rtc_dev *chip = platform_get_drvdata(pdev); 608 609 ac100_rtc_unregister_clks(chip); 610 611 return 0; 612 } 613 614 static const struct of_device_id ac100_rtc_match[] = { 615 { .compatible = "x-powers,ac100-rtc" }, 616 { }, 617 }; 618 MODULE_DEVICE_TABLE(of, ac100_rtc_match); 619 620 static struct platform_driver ac100_rtc_driver = { 621 .probe = ac100_rtc_probe, 622 .remove = ac100_rtc_remove, 623 .driver = { 624 .name = "ac100-rtc", 625 .of_match_table = of_match_ptr(ac100_rtc_match), 626 }, 627 }; 628 module_platform_driver(ac100_rtc_driver); 629 630 MODULE_DESCRIPTION("X-Powers AC100 RTC driver"); 631 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); 632 MODULE_LICENSE("GPL v2"); 633