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9e1e726311
BCM590xx utilizes a secondary I2C slave address to access additional register space. Add support for the secondary address space by instantiating a dummy I2C device with the appropriate secondary I2C slave address. Also expose a secondary regmap register space so that MFD drivers can access this secondary i2c slave address space. Signed-off-by: Matt Porter <mporter@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*
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* Broadcom BCM590xx PMU
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*
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* Copyright 2014 Linaro Limited
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* Author: Matt Porter <mporter@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/mfd/bcm590xx.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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static const struct mfd_cell bcm590xx_devs[] = {
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{
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.name = "bcm590xx-vregs",
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},
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};
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static const struct regmap_config bcm590xx_regmap_config_pri = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = BCM590XX_MAX_REGISTER_PRI,
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.cache_type = REGCACHE_RBTREE,
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};
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static const struct regmap_config bcm590xx_regmap_config_sec = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = BCM590XX_MAX_REGISTER_SEC,
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.cache_type = REGCACHE_RBTREE,
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};
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static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri,
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const struct i2c_device_id *id)
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{
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struct bcm590xx *bcm590xx;
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int ret;
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bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
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if (!bcm590xx)
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return -ENOMEM;
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i2c_set_clientdata(i2c_pri, bcm590xx);
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bcm590xx->dev = &i2c_pri->dev;
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bcm590xx->i2c_pri = i2c_pri;
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bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
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&bcm590xx_regmap_config_pri);
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if (IS_ERR(bcm590xx->regmap_pri)) {
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ret = PTR_ERR(bcm590xx->regmap_pri);
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dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
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return ret;
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}
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/* Secondary I2C slave address is the base address with A(2) asserted */
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bcm590xx->i2c_sec = i2c_new_dummy(i2c_pri->adapter,
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i2c_pri->addr | BIT(2));
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if (IS_ERR_OR_NULL(bcm590xx->i2c_sec)) {
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dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
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return -ENODEV;
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}
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i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
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bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
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&bcm590xx_regmap_config_sec);
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if (IS_ERR(bcm590xx->regmap_sec)) {
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ret = PTR_ERR(bcm590xx->regmap_sec);
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dev_err(&bcm590xx->i2c_sec->dev,
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"secondary regmap init failed: %d\n", ret);
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goto err;
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}
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ret = mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
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ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
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if (ret < 0) {
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dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
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goto err;
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}
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return 0;
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err:
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i2c_unregister_device(bcm590xx->i2c_sec);
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return ret;
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}
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static const struct of_device_id bcm590xx_of_match[] = {
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{ .compatible = "brcm,bcm59056" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
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static const struct i2c_device_id bcm590xx_i2c_id[] = {
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{ "bcm59056" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
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static struct i2c_driver bcm590xx_i2c_driver = {
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.driver = {
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.name = "bcm590xx",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(bcm590xx_of_match),
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},
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.probe = bcm590xx_i2c_probe,
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.id_table = bcm590xx_i2c_id,
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};
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module_i2c_driver(bcm590xx_i2c_driver);
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MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
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MODULE_DESCRIPTION("BCM590xx multi-function driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:bcm590xx");
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