regmap: add i3c bus support

Add basic support for i3c bus.
This is a simple implementation that only give support
for SDR Read and Write commands.

Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vitor Soares 2019-06-06 17:12:02 +02:00 committed by Mark Brown
parent a188339ca5
commit 6445500b43
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GPG Key ID: 24D68B725D5487D0
4 changed files with 86 additions and 1 deletions

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@ -4,7 +4,7 @@
# 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)
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_I3C)
select IRQ_DOMAIN if REGMAP_IRQ
bool
@ -49,3 +49,7 @@ config REGMAP_SOUNDWIRE
config REGMAP_SCCB
tristate
depends on I2C
config REGMAP_I3C
tristate
depends on I3C

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@ -16,3 +16,4 @@ obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
obj-$(CONFIG_REGMAP_W1) += regmap-w1.o
obj-$(CONFIG_REGMAP_SOUNDWIRE) += regmap-sdw.o
obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o

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@ -0,0 +1,60 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
#include <linux/regmap.h>
#include <linux/i3c/device.h>
#include <linux/i3c/master.h>
#include <linux/module.h>
static int regmap_i3c_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
struct i3c_device *i3c = dev_to_i3cdev(dev);
struct i3c_priv_xfer xfers[] = {
{
.rnw = false,
.len = count,
.data.out = data,
},
};
return i3c_device_do_priv_xfers(i3c, xfers, 1);
}
static int regmap_i3c_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct device *dev = context;
struct i3c_device *i3c = dev_to_i3cdev(dev);
struct i3c_priv_xfer xfers[2];
xfers[0].rnw = false;
xfers[0].len = reg_size;
xfers[0].data.out = reg;
xfers[1].rnw = true;
xfers[1].len = val_size;
xfers[1].data.in = val;
return i3c_device_do_priv_xfers(i3c, xfers, 2);
}
static struct regmap_bus regmap_i3c = {
.write = regmap_i3c_write,
.read = regmap_i3c_read,
};
struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
return __devm_regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);
MODULE_AUTHOR("Vitor Soares <vitor.soares@synopsys.com>");
MODULE_DESCRIPTION("Regmap I3C Module");
MODULE_LICENSE("GPL v2");

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@ -25,6 +25,7 @@ struct module;
struct clk;
struct device;
struct i2c_client;
struct i3c_device;
struct irq_domain;
struct slim_device;
struct spi_device;
@ -624,6 +625,10 @@ struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
/*
* Wrapper for regmap_init macros to include a unique lockdep key and name
* for each call. No-op if CONFIG_LOCKDEP is not set.
@ -982,6 +987,21 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
#define devm_regmap_init_slimbus(slimbus, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_slimbus, #config, \
slimbus, config)
/**
* devm_regmap_init_i3c() - Initialise managed register map
*
* @i3c: 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_i3c(i3c, config) \
__regmap_lockdep_wrapper(__devm_regmap_init_i3c, #config, \
i3c, config)
int regmap_mmio_attach_clk(struct regmap *map, struct clk *clk);
void regmap_mmio_detach_clk(struct regmap *map);
void regmap_exit(struct regmap *map);