mfd: Add bcm590xx pmu driver

Add a driver for the BCM590xx PMU multi-function devices. The driver
initially supports regmap initialization and instantiation of the
voltage regulator device function of the PMU.

Signed-off-by: Matt Porter <mporter@linaro.org>
Reviewed-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 102 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d22ca0fc873f..7587c9e1a519 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -59,6 +59,14 @@ config MFD_AAT2870_CORE
           additional drivers must be enabled in order to use the
           functionality of the device.
 
+config MFD_BCM590XX
+        tristate "Broadcom BCM590xx PMUs"
+        select MFD_CORE
+        select REGMAP_I2C
+        depends on I2C
+        help
+          Support for the BCM590xx PMUs from Broadcom
+
 config MFD_CROS_EC
         tristate "ChromeOS Embedded Controller"
         select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 89a7951503ca..23835dfa615c 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_MFD_88PM800)	+= 88pm800.o 88pm80x.o
 obj-$(CONFIG_MFD_88PM805)       += 88pm805.o 88pm80x.o
 obj-$(CONFIG_MFD_SM501)         += sm501.o
 obj-$(CONFIG_MFD_ASIC3)         += asic3.o tmio_core.o
+obj-$(CONFIG_MFD_BCM590XX)      += bcm590xx.o
 obj-$(CONFIG_MFD_CROS_EC)       += cros_ec.o
 obj-$(CONFIG_MFD_CROS_EC_I2C)   += cros_ec_i2c.o
 obj-$(CONFIG_MFD_CROS_EC_SPI)   += cros_ec_spi.o
diff --git a/drivers/mfd/bcm590xx.c b/drivers/mfd/bcm590xx.c
new file mode 100644
index 000000000000..926a57e4d533
--- /dev/null
+++ b/drivers/mfd/bcm590xx.c
@@ -0,0 +1,93 @@
+/*
+ * Broadcom BCM590xx PMU
+ *
+ * Copyright 2014 Linaro Limited
+ * Author: Matt Porter <mporter@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under  the terms of the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/mfd/bcm590xx.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+static const struct mfd_cell bcm590xx_devs[] = {
+        {
+                .name = "bcm590xx-vregs",
+        },
+};
+
+static const struct regmap_config bcm590xx_regmap_config = {
+        .reg_bits       = 8,
+        .val_bits       = 8,
+        .max_register   = BCM590XX_MAX_REGISTER,
+        .cache_type     = REGCACHE_RBTREE,
+};
+
+static int bcm590xx_i2c_probe(struct i2c_client *i2c,
+                              const struct i2c_device_id *id)
+{
+        struct bcm590xx *bcm590xx;
+        int ret;
+
+        bcm590xx = devm_kzalloc(&i2c->dev, sizeof(*bcm590xx), GFP_KERNEL);
+        if (!bcm590xx)
+                return -ENOMEM;
+
+        i2c_set_clientdata(i2c, bcm590xx);
+        bcm590xx->dev = &i2c->dev;
+        bcm590xx->i2c_client = i2c;
+
+        bcm590xx->regmap = devm_regmap_init_i2c(i2c, &bcm590xx_regmap_config);
+        if (IS_ERR(bcm590xx->regmap)) {
+                ret = PTR_ERR(bcm590xx->regmap);
+                dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
+                return ret;
+        }
+
+        ret = mfd_add_devices(&i2c->dev, -1, bcm590xx_devs,
+                              ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
+        if (ret < 0)
+                dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
+
+        return ret;
+}
+
+static const struct of_device_id bcm590xx_of_match[] = {
+        { .compatible = "brcm,bcm59056" },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, bcm590xx_of_match);
+
+static const struct i2c_device_id bcm590xx_i2c_id[] = {
+        { "bcm59056" },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
+
+static struct i2c_driver bcm590xx_i2c_driver = {
+        .driver = {
+                   .name = "bcm590xx",
+                   .owner = THIS_MODULE,
+                   .of_match_table = of_match_ptr(bcm590xx_of_match),
+        },
+        .probe = bcm590xx_i2c_probe,
+        .id_table = bcm590xx_i2c_id,
+};
+module_i2c_driver(bcm590xx_i2c_driver);
+
+MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
+MODULE_DESCRIPTION("BCM590xx multi-function driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:bcm590xx");