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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>
This commit is contained in:
Sander Vanheule 2021-05-17 21:28:03 +02:00 committed by Mark Brown
parent 6efb943b86
commit 1f89d2fe16
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
4 changed files with 99 additions and 1 deletions
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6
drivers/base/regmap/Kconfig
View File

@ -4,8 +4,9 @@
# subsystems should select the appropriate symbols.
config REGMAP
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)
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)
select IRQ_DOMAIN if REGMAP_IRQ
select MDIO_BUS if REGMAP_MDIO
bool
config REGCACHE_COMPRESSED
@ -36,6 +37,9 @@ config REGMAP_W1
tristate
depends on W1
config REGMAP_MDIO
tristate
config REGMAP_MMIO
tristate

1
drivers/base/regmap/Makefile
View File

@ -19,3 +19,4 @@ obj-$(CONFIG_REGMAP_SOUNDWIRE_MBQ) += regmap-sdw-mbq.o
obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o
obj-$(CONFIG_REGMAP_SPI_AVMM) += regmap-spi-avmm.o
obj-$(CONFIG_REGMAP_MDIO) += regmap-mdio.o

57
drivers/base/regmap/regmap-mdio.c Normal file
View File

@ -0,0 +1,57 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/errno.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/regmap.h>
static int regmap_mdio_read(void *context, unsigned int reg, unsigned int *val)
{
struct mdio_device *mdio_dev = context;
int ret;
ret = mdiobus_read(mdio_dev->bus, mdio_dev->addr, reg);
*val = ret & 0xffff;
return ret < 0 ? ret : 0;
}
static int regmap_mdio_write(void *context, unsigned int reg, unsigned int val)
{
struct mdio_device *mdio_dev = context;
return mdiobus_write(mdio_dev->bus, mdio_dev->addr, reg, val);
}
static const struct regmap_bus regmap_mdio_bus = {
.reg_write = regmap_mdio_write,
.reg_read = regmap_mdio_read,
};
struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
const struct regmap_config *config, struct lock_class_key *lock_key,
const char *lock_name)
{
if (config->reg_bits != 5 || config->val_bits != 16)
return ERR_PTR(-EOPNOTSUPP);
return __regmap_init(&mdio_dev->dev, &regmap_mdio_bus, mdio_dev, config,
lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_mdio);
struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
const struct regmap_config *config, struct lock_class_key *lock_key,
const char *lock_name)
{
if (config->reg_bits != 5 || config->val_bits != 16)
return ERR_PTR(-EOPNOTSUPP);
return __devm_regmap_init(&mdio_dev->dev, &regmap_mdio_bus, mdio_dev,
config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
MODULE_DESCRIPTION("Regmap MDIO Module");
MODULE_LICENSE("GPL v2");

36
include/linux/regmap.h
View File

@ -27,6 +27,7 @@ struct device_node;
struct i2c_client;
struct i3c_device;
struct irq_domain;
struct mdio_device;
struct slim_device;
struct spi_device;
struct spmi_device;
@ -538,6 +539,10 @@ struct regmap *__regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__regmap_init_sccb(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
@ -594,6 +599,10 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
@ -697,6 +706,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
__regmap_lockdep_wrapper(__regmap_init_i2c, #config, \
i2c, config)
/**
* regmap_init_mdio() - Initialise register map
*
* @mdio_dev: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer to
* a struct regmap.
*/
#define regmap_init_mdio(mdio_dev, config) \
__regmap_lockdep_wrapper(__regmap_init_mdio, #config, \
mdio_dev, config)
/**
* regmap_init_sccb() - Initialise register map
*
@ -888,6 +910,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config, \
i2c, config)
/**
* devm_regmap_init_mdio() - Initialise managed register map
*
* @mdio_dev: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer
* to a struct regmap. The regmap will be automatically freed by the
* device management code.
*/
#define devm_regmap_init_mdio(mdio_dev, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_mdio, #config, \
mdio_dev, config)
/**
* devm_regmap_init_sccb() - Initialise managed register map
*