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regmap: add SPMI support

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Add basic support for the System Power Management Interface (SPMI) bus.
This is a simple implementation which only implements register accesses
via the Extended Register Read/Write Long commands.

Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Josh Cartwright 2013-10-28 13:12:35 -05:00 committed by Mark Brown
parent 959f58544b
commit a01779f89f
4 changed files with 100 additions and 1 deletions
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5
drivers/base/regmap/Kconfig
View File

@ -3,7 +3,7 @@
# subsystems should select the appropriate symbols.
config REGMAP
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_MMIO || REGMAP_IRQ)
default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_MMIO || REGMAP_IRQ)
select LZO_COMPRESS
select LZO_DECOMPRESS
select IRQ_DOMAIN if REGMAP_IRQ
@ -15,6 +15,9 @@ config REGMAP_I2C
config REGMAP_SPI
tristate
config REGMAP_SPMI
tristate
config REGMAP_MMIO
tristate

1
drivers/base/regmap/Makefile
View File

@ -3,5 +3,6 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o regcache-flat.o
obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o

90
drivers/base/regmap/regmap-spmi.c Normal file
View File

@ -0,0 +1,90 @@
/*
* Register map access API - SPMI support
*
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* Based on regmap-i2c.c:
* Copyright 2011 Wolfson Microelectronics plc
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/regmap.h>
#include <linux/spmi.h>
#include <linux/module.h>
#include <linux/init.h>
static int regmap_spmi_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
BUG_ON(reg_size != 2);
return spmi_ext_register_readl(context, *(u16 *)reg,
val, val_size);
}
static int regmap_spmi_gather_write(void *context,
const void *reg, size_t reg_size,
const void *val, size_t val_size)
{
BUG_ON(reg_size != 2);
return spmi_ext_register_writel(context, *(u16 *)reg, val, val_size);
}
static int regmap_spmi_write(void *context, const void *data,
size_t count)
{
BUG_ON(count < 2);
return regmap_spmi_gather_write(context, data, 2, data + 2, count - 2);
}
static struct regmap_bus regmap_spmi = {
.read = regmap_spmi_read,
.write = regmap_spmi_write,
.gather_write = regmap_spmi_gather_write,
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
};
/**
* regmap_init_spmi(): Initialize register map
*
* @sdev: 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.
*/
struct regmap *regmap_init_spmi(struct spmi_device *sdev,
const struct regmap_config *config)
{
return regmap_init(&sdev->dev, &regmap_spmi, sdev, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spmi);
/**
* devm_regmap_init_spmi(): Initialise managed register map
*
* @sdev: 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.
*/
struct regmap *devm_regmap_init_spmi(struct spmi_device *sdev,
const struct regmap_config *config)
{
return devm_regmap_init(&sdev->dev, &regmap_spmi, sdev, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi);
MODULE_LICENSE("GPL");

5
include/linux/regmap.h
View File

@ -23,6 +23,7 @@ struct device;
struct i2c_client;
struct irq_domain;
struct spi_device;
struct spmi_device;
struct regmap;
struct regmap_range_cfg;
struct regmap_field;
@ -318,6 +319,8 @@ struct regmap *regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config);
struct regmap *regmap_init_spi(struct spi_device *dev,
const struct regmap_config *config);
struct regmap *regmap_init_spmi(struct spmi_device *dev,
const struct regmap_config *config);
struct regmap *regmap_init_mmio_clk(struct device *dev, const char *clk_id,
void __iomem *regs,
const struct regmap_config *config);
@ -330,6 +333,8 @@ struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
const struct regmap_config *config);
struct regmap *devm_regmap_init_spi(struct spi_device *dev,
const struct regmap_config *config);
struct regmap *devm_regmap_init_spmi(struct spmi_device *dev,
const struct regmap_config *config);
struct regmap *devm_regmap_init_mmio_clk(struct device *dev, const char *clk_id,
void __iomem *regs,
const struct regmap_config *config);