v4.19.13 snapshot.
diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
new file mode 100644
index 0000000..22f7054
--- /dev/null
+++ b/drivers/mfd/wm831x-i2c.c
@@ -0,0 +1,140 @@
+/*
+ * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs
+ *
+ * Copyright 2009,2010 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 as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+
+static int wm831x_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
+ const struct of_device_id *of_id;
+ struct wm831x *wm831x;
+ enum wm831x_parent type;
+ int ret;
+
+ if (i2c->dev.of_node) {
+ of_id = of_match_device(wm831x_of_match, &i2c->dev);
+ if (!of_id) {
+ dev_err(&i2c->dev, "Failed to match device\n");
+ return -ENODEV;
+ }
+ type = (enum wm831x_parent)of_id->data;
+ } else {
+ type = (enum wm831x_parent)id->driver_data;
+ }
+
+ wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
+ if (wm831x == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, wm831x);
+ wm831x->dev = &i2c->dev;
+ wm831x->type = type;
+
+ wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
+ if (IS_ERR(wm831x->regmap)) {
+ ret = PTR_ERR(wm831x->regmap);
+ dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (pdata)
+ memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
+
+ return wm831x_device_init(wm831x, i2c->irq);
+}
+
+static int wm831x_i2c_remove(struct i2c_client *i2c)
+{
+ struct wm831x *wm831x = i2c_get_clientdata(i2c);
+
+ wm831x_device_exit(wm831x);
+
+ return 0;
+}
+
+static int wm831x_i2c_suspend(struct device *dev)
+{
+ struct wm831x *wm831x = dev_get_drvdata(dev);
+
+ return wm831x_device_suspend(wm831x);
+}
+
+static int wm831x_i2c_poweroff(struct device *dev)
+{
+ struct wm831x *wm831x = dev_get_drvdata(dev);
+
+ wm831x_device_shutdown(wm831x);
+
+ return 0;
+}
+
+static const struct i2c_device_id wm831x_i2c_id[] = {
+ { "wm8310", WM8310 },
+ { "wm8311", WM8311 },
+ { "wm8312", WM8312 },
+ { "wm8320", WM8320 },
+ { "wm8321", WM8321 },
+ { "wm8325", WM8325 },
+ { "wm8326", WM8326 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
+
+static const struct dev_pm_ops wm831x_pm_ops = {
+ .suspend = wm831x_i2c_suspend,
+ .poweroff = wm831x_i2c_poweroff,
+};
+
+static struct i2c_driver wm831x_i2c_driver = {
+ .driver = {
+ .name = "wm831x",
+ .pm = &wm831x_pm_ops,
+ .of_match_table = of_match_ptr(wm831x_of_match),
+ },
+ .probe = wm831x_i2c_probe,
+ .remove = wm831x_i2c_remove,
+ .id_table = wm831x_i2c_id,
+};
+
+static int __init wm831x_i2c_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&wm831x_i2c_driver);
+ if (ret != 0)
+ pr_err("Failed to register wm831x I2C driver: %d\n", ret);
+
+ return ret;
+}
+subsys_initcall(wm831x_i2c_init);
+
+static void __exit wm831x_i2c_exit(void)
+{
+ i2c_del_driver(&wm831x_i2c_driver);
+}
+module_exit(wm831x_i2c_exit);