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regmap: Add MDIO bus support
Basic support for MDIO bus access. Support only includes clause-22 register access, with 5-bit addresses, and 16-bit wide registers. Signed-off-by: Sander Vanheule <sander@svanheule.net> Link: https://lore.kernel.org/r/63b99a2fec2c4ea3c461d59d451af8d675ecf312.1621279162.git.sander@svanheule.net Signed-off-by: Mark Brown <broonie@kernel.org>
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parent
6efb943b86
commit
1f89d2fe16
4 changed files with 99 additions and 1 deletions
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@ -4,8 +4,9 @@
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# subsystems should select the appropriate symbols.
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# subsystems should select the appropriate symbols.
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config REGMAP
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config REGMAP
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default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM)
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default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MDIO)
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select IRQ_DOMAIN if REGMAP_IRQ
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select IRQ_DOMAIN if REGMAP_IRQ
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select MDIO_BUS if REGMAP_MDIO
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bool
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bool
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config REGCACHE_COMPRESSED
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config REGCACHE_COMPRESSED
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@ -36,6 +37,9 @@ config REGMAP_W1
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tristate
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tristate
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depends on W1
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depends on W1
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config REGMAP_MDIO
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tristate
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config REGMAP_MMIO
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config REGMAP_MMIO
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tristate
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tristate
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@ -19,3 +19,4 @@ obj-$(CONFIG_REGMAP_SOUNDWIRE_MBQ) += regmap-sdw-mbq.o
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obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
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obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
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obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o
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obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o
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obj-$(CONFIG_REGMAP_SPI_AVMM) += regmap-spi-avmm.o
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obj-$(CONFIG_REGMAP_SPI_AVMM) += regmap-spi-avmm.o
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obj-$(CONFIG_REGMAP_MDIO) += regmap-mdio.o
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57
drivers/base/regmap/regmap-mdio.c
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57
drivers/base/regmap/regmap-mdio.c
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@ -0,0 +1,57 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/errno.h>
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#include <linux/mdio.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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static int regmap_mdio_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct mdio_device *mdio_dev = context;
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int ret;
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ret = mdiobus_read(mdio_dev->bus, mdio_dev->addr, reg);
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*val = ret & 0xffff;
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return ret < 0 ? ret : 0;
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}
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static int regmap_mdio_write(void *context, unsigned int reg, unsigned int val)
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{
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struct mdio_device *mdio_dev = context;
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return mdiobus_write(mdio_dev->bus, mdio_dev->addr, reg, val);
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}
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static const struct regmap_bus regmap_mdio_bus = {
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.reg_write = regmap_mdio_write,
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.reg_read = regmap_mdio_read,
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};
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struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
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const struct regmap_config *config, struct lock_class_key *lock_key,
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const char *lock_name)
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{
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if (config->reg_bits != 5 || config->val_bits != 16)
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return ERR_PTR(-EOPNOTSUPP);
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return __regmap_init(&mdio_dev->dev, ®map_mdio_bus, mdio_dev, config,
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lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__regmap_init_mdio);
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struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
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const struct regmap_config *config, struct lock_class_key *lock_key,
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const char *lock_name)
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{
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if (config->reg_bits != 5 || config->val_bits != 16)
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return ERR_PTR(-EOPNOTSUPP);
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return __devm_regmap_init(&mdio_dev->dev, ®map_mdio_bus, mdio_dev,
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config, lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
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MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
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MODULE_DESCRIPTION("Regmap MDIO Module");
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MODULE_LICENSE("GPL v2");
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@ -27,6 +27,7 @@ struct device_node;
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struct i2c_client;
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struct i2c_client;
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struct i3c_device;
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struct i3c_device;
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struct irq_domain;
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struct irq_domain;
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struct mdio_device;
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struct slim_device;
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struct slim_device;
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struct spi_device;
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struct spi_device;
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struct spmi_device;
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struct spmi_device;
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@ -538,6 +539,10 @@ struct regmap *__regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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struct lock_class_key *lock_key,
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const char *lock_name);
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const char *lock_name);
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struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name);
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struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
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struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
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const struct regmap_config *config,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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struct lock_class_key *lock_key,
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@ -594,6 +599,10 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c,
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const struct regmap_config *config,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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struct lock_class_key *lock_key,
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const char *lock_name);
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const char *lock_name);
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struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name);
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struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
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struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
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const struct regmap_config *config,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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struct lock_class_key *lock_key,
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@ -697,6 +706,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
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__regmap_lockdep_wrapper(__regmap_init_i2c, #config, \
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__regmap_lockdep_wrapper(__regmap_init_i2c, #config, \
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i2c, config)
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i2c, config)
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/**
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* regmap_init_mdio() - Initialise register map
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*
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* @mdio_dev: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer to
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* a struct regmap.
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*/
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#define regmap_init_mdio(mdio_dev, config) \
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__regmap_lockdep_wrapper(__regmap_init_mdio, #config, \
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mdio_dev, config)
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/**
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/**
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* regmap_init_sccb() - Initialise register map
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* regmap_init_sccb() - Initialise register map
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*
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*
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__regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config, \
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__regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config, \
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i2c, config)
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i2c, config)
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/**
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* devm_regmap_init_mdio() - Initialise managed register map
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*
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* @mdio_dev: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer
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* to a struct regmap. The regmap will be automatically freed by the
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* device management code.
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*/
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#define devm_regmap_init_mdio(mdio_dev, config) \
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__regmap_lockdep_wrapper(__devm_regmap_init_mdio, #config, \
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mdio_dev, config)
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/**
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/**
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* devm_regmap_init_sccb() - Initialise managed register map
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* devm_regmap_init_sccb() - Initialise managed register map
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*
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*
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