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Unverified Commit 6445500b authored by Vitor Soares's avatar Vitor Soares Committed by Mark Brown
Browse files

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: default avatarVitor Soares <vitor.soares@synopsys.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a188339c

drivers/base/regmap/Kconfig

+5 −1
Original line number Diff line number Diff line
@@ -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

drivers/base/regmap/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/base/regmap/regmap-i3c.c

0 → 100644
+60 −0
Original line number Diff line number Diff line 
// 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");

include/linux/regmap.h

+20 −0
Original line number Diff line number Diff line
@@ -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);