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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/drivers/base/regmap/regmap.c
....@@ -1,21 +1,17 @@
1
-/*
2
- * Register map access API
3
- *
4
- * Copyright 2011 Wolfson Microelectronics plc
5
- *
6
- * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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
- */
1
+// SPDX-License-Identifier: GPL-2.0
2
+//
3
+// Register map access API
4
+//
5
+// Copyright 2011 Wolfson Microelectronics plc
6
+//
7
+// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
128 
139 #include <linux/device.h>
1410 #include <linux/slab.h>
1511 #include <linux/export.h>
1612 #include <linux/mutex.h>
1713 #include <linux/err.h>
18
-#include <linux/of.h>
14
+#include <linux/property.h>
1915 #include <linux/rbtree.h>
2016 #include <linux/sched.h>
2117 #include <linux/delay.h>
....@@ -35,6 +31,16 @@
3531  * register I/O on a specific device.
3632  */
3733 #undef LOG_DEVICE
34
+
35
+#ifdef LOG_DEVICE
36
+static inline bool regmap_should_log(struct regmap *map)
37
+{
38
+	return (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0);
39
+}
40
+#else
41
+static inline bool regmap_should_log(struct regmap *map) { return false; }
42
+#endif
43
+
3844 
3945 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
4046 			       unsigned int mask, unsigned int val,
....@@ -169,6 +175,17 @@
169175 	return false;
170176 }
171177 
178
+bool regmap_writeable_noinc(struct regmap *map, unsigned int reg)
179
+{
180
+	if (map->writeable_noinc_reg)
181
+		return map->writeable_noinc_reg(map->dev, reg);
182
+
183
+	if (map->wr_noinc_table)
184
+		return regmap_check_range_table(map, reg, map->wr_noinc_table);
185
+
186
+	return true;
187
+}
188
+
172189 bool regmap_readable_noinc(struct regmap *map, unsigned int reg)
173190 {
174191 	if (map->readable_noinc_reg)
....@@ -191,6 +208,18 @@
191208 
192209 	return true;
193210 }
211
+
212
+static void regmap_format_12_20_write(struct regmap *map,
213
+				     unsigned int reg, unsigned int val)
214
+{
215
+	u8 *out = map->work_buf;
216
+
217
+	out[0] = reg >> 4;
218
+	out[1] = (reg << 4) | (val >> 16);
219
+	out[2] = val >> 8;
220
+	out[3] = val;
221
+}
222
+
194223 
195224 static void regmap_format_2_6_write(struct regmap *map,
196225 				     unsigned int reg, unsigned int val)
....@@ -564,14 +593,35 @@
564593 	kfree(map->selector_work_buf);
565594 }
566595 
596
+static int regmap_set_name(struct regmap *map, const struct regmap_config *config)
597
+{
598
+	if (config->name) {
599
+		const char *name = kstrdup_const(config->name, GFP_KERNEL);
600
+
601
+		if (!name)
602
+			return -ENOMEM;
603
+
604
+		kfree_const(map->name);
605
+		map->name = name;
606
+	}
607
+
608
+	return 0;
609
+}
610
+
567611 int regmap_attach_dev(struct device *dev, struct regmap *map,
568612 		      const struct regmap_config *config)
569613 {
570614 	struct regmap **m;
615
+	int ret;
571616 
572617 	map->dev = dev;
573618 
574
-	regmap_debugfs_init(map, config->name);
619
+	ret = regmap_set_name(map, config);
620
+	if (ret)
621
+		return ret;
622
+
623
+	regmap_debugfs_exit(map);
624
+	regmap_debugfs_init(map);
575625 
576626 	/* Add a devres resource for dev_get_regmap() */
577627 	m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
....@@ -614,7 +664,7 @@
614664 					 const struct regmap_bus *bus,
615665 					 const struct regmap_config *config)
616666 {
617
-	struct device_node *np;
667
+	struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL;
618668 	enum regmap_endian endian;
619669 
620670 	/* Retrieve the endianness specification from the regmap config */
....@@ -624,22 +674,17 @@
624674 	if (endian != REGMAP_ENDIAN_DEFAULT)
625675 		return endian;
626676 
627
-	/* If the dev and dev->of_node exist try to get endianness from DT */
628
-	if (dev && dev->of_node) {
629
-		np = dev->of_node;
677
+	/* If the firmware node exist try to get endianness from it */
678
+	if (fwnode_property_read_bool(fwnode, "big-endian"))
679
+		endian = REGMAP_ENDIAN_BIG;
680
+	else if (fwnode_property_read_bool(fwnode, "little-endian"))
681
+		endian = REGMAP_ENDIAN_LITTLE;
682
+	else if (fwnode_property_read_bool(fwnode, "native-endian"))
683
+		endian = REGMAP_ENDIAN_NATIVE;
630684 
631
-		/* Parse the device's DT node for an endianness specification */
632
-		if (of_property_read_bool(np, "big-endian"))
633
-			endian = REGMAP_ENDIAN_BIG;
634
-		else if (of_property_read_bool(np, "little-endian"))
635
-			endian = REGMAP_ENDIAN_LITTLE;
636
-		else if (of_property_read_bool(np, "native-endian"))
637
-			endian = REGMAP_ENDIAN_NATIVE;
638
-
639
-		/* If the endianness was specified in DT, use that */
640
-		if (endian != REGMAP_ENDIAN_DEFAULT)
641
-			return endian;
642
-	}
685
+	/* If the endianness was specified in fwnode, use that */
686
+	if (endian != REGMAP_ENDIAN_DEFAULT)
687
+		return endian;
643688 
644689 	/* Retrieve the endianness specification from the bus config */
645690 	if (bus && bus->val_format_endian_default)
....@@ -675,21 +720,21 @@
675720 		goto err;
676721 	}
677722 
678
-	if (config->name) {
679
-		map->name = kstrdup_const(config->name, GFP_KERNEL);
680
-		if (!map->name) {
681
-			ret = -ENOMEM;
682
-			goto err_map;
683
-		}
684
-	}
723
+	ret = regmap_set_name(map, config);
724
+	if (ret)
725
+		goto err_map;
726
+
727
+	ret = -EINVAL; /* Later error paths rely on this */
685728 
686729 	if (config->disable_locking) {
687730 		map->lock = map->unlock = regmap_lock_unlock_none;
731
+		map->can_sleep = config->can_sleep;
688732 		regmap_debugfs_disable(map);
689733 	} else if (config->lock && config->unlock) {
690734 		map->lock = config->lock;
691735 		map->unlock = config->unlock;
692736 		map->lock_arg = config->lock_arg;
737
+		map->can_sleep = config->can_sleep;
693738 	} else if (config->use_hwlock) {
694739 		map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
695740 		if (!map->hwlock) {
....@@ -725,6 +770,7 @@
725770 			mutex_init(&map->mutex);
726771 			map->lock = regmap_lock_mutex;
727772 			map->unlock = regmap_unlock_mutex;
773
+			map->can_sleep = true;
728774 			lockdep_set_class_and_name(&map->mutex,
729775 						   lock_key, lock_name);
730776 		}
....@@ -754,8 +800,8 @@
754800 		map->reg_stride_order = ilog2(map->reg_stride);
755801 	else
756802 		map->reg_stride_order = -1;
757
-	map->use_single_read = config->use_single_rw || !bus || !bus->read;
758
-	map->use_single_write = config->use_single_rw || !bus || !bus->write;
803
+	map->use_single_read = config->use_single_read || !bus || !bus->read;
804
+	map->use_single_write = config->use_single_write || !bus || !bus->write;
759805 	map->can_multi_write = config->can_multi_write && bus && bus->write;
760806 	if (bus) {
761807 		map->max_raw_read = bus->max_raw_read;
....@@ -769,11 +815,13 @@
769815 	map->rd_table = config->rd_table;
770816 	map->volatile_table = config->volatile_table;
771817 	map->precious_table = config->precious_table;
818
+	map->wr_noinc_table = config->wr_noinc_table;
772819 	map->rd_noinc_table = config->rd_noinc_table;
773820 	map->writeable_reg = config->writeable_reg;
774821 	map->readable_reg = config->readable_reg;
775822 	map->volatile_reg = config->volatile_reg;
776823 	map->precious_reg = config->precious_reg;
824
+	map->writeable_noinc_reg = config->writeable_noinc_reg;
777825 	map->readable_noinc_reg = config->readable_noinc_reg;
778826 	map->cache_type = config->cache_type;
779827 
....@@ -800,6 +848,7 @@
800848 	} else if (!bus->read || !bus->write) {
801849 		map->reg_read = _regmap_bus_reg_read;
802850 		map->reg_write = _regmap_bus_reg_write;
851
+		map->reg_update_bits = bus->reg_update_bits;
803852 
804853 		map->defer_caching = false;
805854 		goto skip_format_initialization;
....@@ -846,6 +895,16 @@
846895 		switch (config->val_bits) {
847896 		case 14:
848897 			map->format.format_write = regmap_format_10_14_write;
898
+			break;
899
+		default:
900
+			goto err_hwlock;
901
+		}
902
+		break;
903
+
904
+	case 12:
905
+		switch (config->val_bits) {
906
+		case 20:
907
+			map->format.format_write = regmap_format_12_20_write;
849908 			break;
850909 		default:
851910 			goto err_hwlock;
....@@ -1122,7 +1181,7 @@
11221181 		if (ret != 0)
11231182 			goto err_regcache;
11241183 	} else {
1125
-		regmap_debugfs_init(map, config->name);
1184
+		regmap_debugfs_init(map);
11261185 	}
11271186 
11281187 	return map;
....@@ -1212,6 +1271,106 @@
12121271 }
12131272 EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
12141273 
1274
+
1275
+/**
1276
+ * regmap_field_bulk_alloc() - Allocate and initialise a bulk register field.
1277
+ *
1278
+ * @regmap: regmap bank in which this register field is located.
1279
+ * @rm_field: regmap register fields within the bank.
1280
+ * @reg_field: Register fields within the bank.
1281
+ * @num_fields: Number of register fields.
1282
+ *
1283
+ * The return value will be an -ENOMEM on error or zero for success.
1284
+ * Newly allocated regmap_fields should be freed by calling
1285
+ * regmap_field_bulk_free()
1286
+ */
1287
+int regmap_field_bulk_alloc(struct regmap *regmap,
1288
+			    struct regmap_field **rm_field,
1289
+			    struct reg_field *reg_field,
1290
+			    int num_fields)
1291
+{
1292
+	struct regmap_field *rf;
1293
+	int i;
1294
+
1295
+	rf = kcalloc(num_fields, sizeof(*rf), GFP_KERNEL);
1296
+	if (!rf)
1297
+		return -ENOMEM;
1298
+
1299
+	for (i = 0; i < num_fields; i++) {
1300
+		regmap_field_init(&rf[i], regmap, reg_field[i]);
1301
+		rm_field[i] = &rf[i];
1302
+	}
1303
+
1304
+	return 0;
1305
+}
1306
+EXPORT_SYMBOL_GPL(regmap_field_bulk_alloc);
1307
+
1308
+/**
1309
+ * devm_regmap_field_bulk_alloc() - Allocate and initialise a bulk register
1310
+ * fields.
1311
+ *
1312
+ * @dev: Device that will be interacted with
1313
+ * @regmap: regmap bank in which this register field is located.
1314
+ * @rm_field: regmap register fields within the bank.
1315
+ * @reg_field: Register fields within the bank.
1316
+ * @num_fields: Number of register fields.
1317
+ *
1318
+ * The return value will be an -ENOMEM on error or zero for success.
1319
+ * Newly allocated regmap_fields will be automatically freed by the
1320
+ * device management code.
1321
+ */
1322
+int devm_regmap_field_bulk_alloc(struct device *dev,
1323
+				 struct regmap *regmap,
1324
+				 struct regmap_field **rm_field,
1325
+				 struct reg_field *reg_field,
1326
+				 int num_fields)
1327
+{
1328
+	struct regmap_field *rf;
1329
+	int i;
1330
+
1331
+	rf = devm_kcalloc(dev, num_fields, sizeof(*rf), GFP_KERNEL);
1332
+	if (!rf)
1333
+		return -ENOMEM;
1334
+
1335
+	for (i = 0; i < num_fields; i++) {
1336
+		regmap_field_init(&rf[i], regmap, reg_field[i]);
1337
+		rm_field[i] = &rf[i];
1338
+	}
1339
+
1340
+	return 0;
1341
+}
1342
+EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_alloc);
1343
+
1344
+/**
1345
+ * regmap_field_bulk_free() - Free register field allocated using
1346
+ *                       regmap_field_bulk_alloc.
1347
+ *
1348
+ * @field: regmap fields which should be freed.
1349
+ */
1350
+void regmap_field_bulk_free(struct regmap_field *field)
1351
+{
1352
+	kfree(field);
1353
+}
1354
+EXPORT_SYMBOL_GPL(regmap_field_bulk_free);
1355
+
1356
+/**
1357
+ * devm_regmap_field_bulk_free() - Free a bulk register field allocated using
1358
+ *                            devm_regmap_field_bulk_alloc.
1359
+ *
1360
+ * @dev: Device that will be interacted with
1361
+ * @field: regmap field which should be freed.
1362
+ *
1363
+ * Free register field allocated using devm_regmap_field_bulk_alloc(). Usually
1364
+ * drivers need not call this function, as the memory allocated via devm
1365
+ * will be freed as per device-driver life-cycle.
1366
+ */
1367
+void devm_regmap_field_bulk_free(struct device *dev,
1368
+				 struct regmap_field *field)
1369
+{
1370
+	devm_kfree(dev, field);
1371
+}
1372
+EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_free);
1373
+
12151374 /**
12161375  * devm_regmap_field_free() - Free a register field allocated using
12171376  *                            devm_regmap_field_alloc.
....@@ -1282,6 +1441,8 @@
12821441  */
12831442 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
12841443 {
1444
+	int ret;
1445
+
12851446 	regcache_exit(map);
12861447 	regmap_debugfs_exit(map);
12871448 
....@@ -1290,10 +1451,15 @@
12901451 	map->readable_reg = config->readable_reg;
12911452 	map->volatile_reg = config->volatile_reg;
12921453 	map->precious_reg = config->precious_reg;
1454
+	map->writeable_noinc_reg = config->writeable_noinc_reg;
12931455 	map->readable_noinc_reg = config->readable_noinc_reg;
12941456 	map->cache_type = config->cache_type;
12951457 
1296
-	regmap_debugfs_init(map, config->name);
1458
+	ret = regmap_set_name(map, config);
1459
+	if (ret)
1460
+		return ret;
1461
+
1462
+	regmap_debugfs_init(map);
12971463 
12981464 	map->cache_bypass = false;
12991465 	map->cache_only = false;
....@@ -1327,6 +1493,8 @@
13271493 	}
13281494 	if (map->hwlock)
13291495 		hwspin_lock_free(map->hwlock);
1496
+	if (map->lock == regmap_lock_mutex)
1497
+		mutex_destroy(&map->mutex);
13301498 	kfree_const(map->name);
13311499 	kfree(map->patch);
13321500 	kfree(map);
....@@ -1448,7 +1616,7 @@
14481616 }
14491617 
14501618 static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
1451
-				  const void *val, size_t val_len)
1619
+				  const void *val, size_t val_len, bool noinc)
14521620 {
14531621 	struct regmap_range_node *range;
14541622 	unsigned long flags;
....@@ -1461,12 +1629,18 @@
14611629 
14621630 	WARN_ON(!map->bus);
14631631 
1464
-	/* Check for unwritable registers before we start */
1465
-	if (map->writeable_reg)
1466
-		for (i = 0; i < val_len / map->format.val_bytes; i++)
1467
-			if (!map->writeable_reg(map->dev,
1468
-					       reg + regmap_get_offset(map, i)))
1632
+	/* Check for unwritable or noinc registers in range
1633
+	 * before we start
1634
+	 */
1635
+	if (!regmap_writeable_noinc(map, reg)) {
1636
+		for (i = 0; i < val_len / map->format.val_bytes; i++) {
1637
+			unsigned int element =
1638
+				reg + regmap_get_offset(map, i);
1639
+			if (!regmap_writeable(map, element) ||
1640
+				regmap_writeable_noinc(map, element))
14691641 				return -EINVAL;
1642
+		}
1643
+	}
14701644 
14711645 	if (!map->cache_bypass && map->format.parse_val) {
14721646 		unsigned int ival;
....@@ -1501,7 +1675,7 @@
15011675 				win_residue, val_len / map->format.val_bytes);
15021676 			ret = _regmap_raw_write_impl(map, reg, val,
15031677 						     win_residue *
1504
-						     map->format.val_bytes);
1678
+						     map->format.val_bytes, noinc);
15051679 			if (ret != 0)
15061680 				return ret;
15071681 
....@@ -1515,7 +1689,7 @@
15151689 			win_residue = range->window_len - win_offset;
15161690 		}
15171691 
1518
-		ret = _regmap_select_page(map, &reg, range, val_num);
1692
+		ret = _regmap_select_page(map, &reg, range, noinc ? 1 : val_num);
15191693 		if (ret != 0)
15201694 			return ret;
15211695 	}
....@@ -1723,7 +1897,8 @@
17231897 				      map->work_buf +
17241898 				      map->format.reg_bytes +
17251899 				      map->format.pad_bytes,
1726
-				      map->format.val_bytes);
1900
+				      map->format.val_bytes,
1901
+				      false);
17271902 }
17281903 
17291904 static inline void *_regmap_map_get_context(struct regmap *map)
....@@ -1750,10 +1925,8 @@
17501925 		}
17511926 	}
17521927 
1753
-#ifdef LOG_DEVICE
1754
-	if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1928
+	if (regmap_should_log(map))
17551929 		dev_info(map->dev, "%x <= %x\n", reg, val);
1756
-#endif
17571930 
17581931 	trace_regmap_reg_write(map, reg, val);
17591932 
....@@ -1819,7 +1992,7 @@
18191992 EXPORT_SYMBOL_GPL(regmap_write_async);
18201993 
18211994 int _regmap_raw_write(struct regmap *map, unsigned int reg,
1822
-		      const void *val, size_t val_len)
1995
+		      const void *val, size_t val_len, bool noinc)
18231996 {
18241997 	size_t val_bytes = map->format.val_bytes;
18251998 	size_t val_count = val_len / val_bytes;
....@@ -1840,7 +2013,7 @@
18402013 
18412014 	/* Write as many bytes as possible with chunk_size */
18422015 	for (i = 0; i < chunk_count; i++) {
1843
-		ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes);
2016
+		ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes, noinc);
18442017 		if (ret)
18452018 			return ret;
18462019 
....@@ -1851,7 +2024,7 @@
18512024 
18522025 	/* Write remaining bytes */
18532026 	if (val_len)
1854
-		ret = _regmap_raw_write_impl(map, reg, val, val_len);
2027
+		ret = _regmap_raw_write_impl(map, reg, val, val_len, noinc);
18552028 
18562029 	return ret;
18572030 }
....@@ -1884,13 +2057,76 @@
18842057 
18852058 	map->lock(map->lock_arg);
18862059 
1887
-	ret = _regmap_raw_write(map, reg, val, val_len);
2060
+	ret = _regmap_raw_write(map, reg, val, val_len, false);
18882061 
18892062 	map->unlock(map->lock_arg);
18902063 
18912064 	return ret;
18922065 }
18932066 EXPORT_SYMBOL_GPL(regmap_raw_write);
2067
+
2068
+/**
2069
+ * regmap_noinc_write(): Write data from a register without incrementing the
2070
+ *			register number
2071
+ *
2072
+ * @map: Register map to write to
2073
+ * @reg: Register to write to
2074
+ * @val: Pointer to data buffer
2075
+ * @val_len: Length of output buffer in bytes.
2076
+ *
2077
+ * The regmap API usually assumes that bulk bus write operations will write a
2078
+ * range of registers. Some devices have certain registers for which a write
2079
+ * operation can write to an internal FIFO.
2080
+ *
2081
+ * The target register must be volatile but registers after it can be
2082
+ * completely unrelated cacheable registers.
2083
+ *
2084
+ * This will attempt multiple writes as required to write val_len bytes.
2085
+ *
2086
+ * A value of zero will be returned on success, a negative errno will be
2087
+ * returned in error cases.
2088
+ */
2089
+int regmap_noinc_write(struct regmap *map, unsigned int reg,
2090
+		      const void *val, size_t val_len)
2091
+{
2092
+	size_t write_len;
2093
+	int ret;
2094
+
2095
+	if (!map->bus)
2096
+		return -EINVAL;
2097
+	if (!map->bus->write)
2098
+		return -ENOTSUPP;
2099
+	if (val_len % map->format.val_bytes)
2100
+		return -EINVAL;
2101
+	if (!IS_ALIGNED(reg, map->reg_stride))
2102
+		return -EINVAL;
2103
+	if (val_len == 0)
2104
+		return -EINVAL;
2105
+
2106
+	map->lock(map->lock_arg);
2107
+
2108
+	if (!regmap_volatile(map, reg) || !regmap_writeable_noinc(map, reg)) {
2109
+		ret = -EINVAL;
2110
+		goto out_unlock;
2111
+	}
2112
+
2113
+	while (val_len) {
2114
+		if (map->max_raw_write && map->max_raw_write < val_len)
2115
+			write_len = map->max_raw_write;
2116
+		else
2117
+			write_len = val_len;
2118
+		ret = _regmap_raw_write(map, reg, val, write_len, true);
2119
+		if (ret)
2120
+			goto out_unlock;
2121
+		val = ((u8 *)val) + write_len;
2122
+		val_len -= write_len;
2123
+	}
2124
+
2125
+out_unlock:
2126
+	map->unlock(map->lock_arg);
2127
+	return ret;
2128
+}
2129
+EXPORT_SYMBOL_GPL(regmap_noinc_write);
18942130 
18952131 /**
18962132  * regmap_field_update_bits_base() - Perform a read/modify/write cycle a
....@@ -1936,7 +2172,7 @@
19362172  * A value of zero will be returned on success, a negative errno will
19372173  * be returned in error cases.
19382174  */
1939
-int regmap_fields_update_bits_base(struct regmap_field *field,  unsigned int id,
2175
+int regmap_fields_update_bits_base(struct regmap_field *field, unsigned int id,
19402176 				   unsigned int mask, unsigned int val,
19412177 				   bool *change, bool async, bool force)
19422178 {
....@@ -2147,8 +2383,12 @@
21472383 				if (ret != 0)
21482384 					return ret;
21492385 
2150
-				if (regs[i].delay_us)
2151
-					udelay(regs[i].delay_us);
2386
+				if (regs[i].delay_us) {
2387
+					if (map->can_sleep)
2388
+						fsleep(regs[i].delay_us);
2389
+					else
2390
+						udelay(regs[i].delay_us);
2391
+				}
21522392 
21532393 				base += n;
21542394 				n = 0;
....@@ -2184,8 +2424,12 @@
21842424 			if (ret != 0)
21852425 				return ret;
21862426 
2187
-			if (regs[i].delay_us)
2188
-				udelay(regs[i].delay_us);
2427
+			if (regs[i].delay_us) {
2428
+				if (map->can_sleep)
2429
+					fsleep(regs[i].delay_us);
2430
+				else
2431
+					udelay(regs[i].delay_us);
2432
+			}
21892433 		}
21902434 		return 0;
21912435 	}
....@@ -2356,7 +2600,7 @@
23562600 
23572601 	map->async = true;
23582602 
2359
-	ret = _regmap_raw_write(map, reg, val, val_len);
2603
+	ret = _regmap_raw_write(map, reg, val, val_len, false);
23602604 
23612605 	map->async = false;
23622606 
....@@ -2445,10 +2689,8 @@
24452689 
24462690 	ret = map->reg_read(context, reg, val);
24472691 	if (ret == 0) {
2448
-#ifdef LOG_DEVICE
2449
-		if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
2692
+		if (regmap_should_log(map))
24502693 			dev_info(map->dev, "%x => %x\n", reg, *val);
2451
-#endif
24522694 
24532695 		trace_regmap_reg_read(map, reg, *val);
24542696 
....@@ -2844,6 +3086,29 @@
28443086 }
28453087 EXPORT_SYMBOL_GPL(regmap_update_bits_base);
28463088 
3089
+/**
3090
+ * regmap_test_bits() - Check if all specified bits are set in a register.
3091
+ *
3092
+ * @map: Register map to operate on
3093
+ * @reg: Register to read from
3094
+ * @bits: Bits to test
3095
+ *
3096
+ * Returns 0 if at least one of the tested bits is not set, 1 if all tested
3097
+ * bits are set and a negative error number if the underlying regmap_read()
3098
+ * fails.
3099
+ */
3100
+int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits)
3101
+{
3102
+	unsigned int val, ret;
3103
+
3104
+	ret = regmap_read(map, reg, &val);
3105
+	if (ret)
3106
+		return ret;
3107
+
3108
+	return (val & bits) == bits;
3109
+}
3110
+EXPORT_SYMBOL_GPL(regmap_test_bits);
3111
+
28473112 void regmap_async_complete_cb(struct regmap_async *async, int ret)
28483113 {
28493114 	struct regmap *map = async->map;