On Fri, 2015-07-10 at 10:44 +0100, Srinivas Kandagatla wrote:

This patch adds just providers part of the framework just to enable easy
review.

Trivial notes:

+struct nvmem_device {
+	const char		*name;
+	struct regmap		*regmap;

[]

+struct nvmem_cell {
+	const char *name;
+	int			offset;
+	int			bytes;

It'd be nicer to use consistent indentation for *name
in nvmem_cell

+static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj,
+				    struct bin_attribute *attr,
+				    char *buf, loff_t pos, size_t count)
+{

[]

+	count = count/nvmem->word_size * nvmem->word_size;

maybe rounddown() ?

+static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,
+				     struct bin_attribute *attr,
+				     char *buf, loff_t pos, size_t count)
+{

+	count = count/nvmem->word_size * nvmem->word_size;

and rounddown() here too ?

+static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np)
+{
+	struct device *d;
+
+	if (!nvmem_np)
+		return NULL;
+
+	d = bus_find_device(&nvmem_bus_type, NULL, nvmem_np, of_nvmem_match);
+
+	return d ? to_nvmem_device(d) : NULL;
+}

Perhaps more common as

	d = bus_find_device(&nvmem_bus_type, NULL, nvmem_np, of_nvmem_match);
	if (!d)
		return NULL;

	return to_nvmem_device(d);
}

+struct nvmem_device *nvmem_register(struct nvmem_config *config)
+{

[]

+	nvmem->read_only = nvmem->dev.of_node ?
+				of_property_read_bool(nvmem->dev.of_node,
+				"read-only") :
+				config->read_only;

odd indentation.
Normally, "read-only" would be aligned with nvmem->dev.of_node,

+	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n",
+		dev_name(&nvmem->dev));

Isn't this going to have duplicated dev_name prefix and postfix?

+	if (device_create_bin_file(&nvmem->dev,
+				nvmem->read_only ? &bin_attr_ro_nvmem :
+				&bin_attr_rw_nvmem))
+		dev_info(&nvmem->dev, "Failed to create sysfs binary file\n");

Is the KERN_LEVEL correct?
Maybe dev_err/notice/warn/dbg?