On Fri, Nov 20, 2020 at 12:14:54PM +0000, Adam Ward wrote:

> Add ability to probe device and validate configuration, then apply a regmap
> configuration for a single or dual buck device accordingly.

This looks like it might benefit from being multiple commits - "X then
Y" type commit logs are often a warning sign of this, it's quite
difficult to review as it's doing several different things.

> +static int da9121_i2c_reg_read(struct i2c_client *client, u8 addr,
> +				    u8 *buf, int count)
> +{
> +	struct i2c_msg xfer[2];
> +	int ret;

Why is this open coding register I/O?

> +	name = of_get_property(chip->dev->of_node, "compatible", NULL);
> +	if (!name) {
> +		dev_err(chip->dev, "Cannot get device not compatible string.\n");
> +		goto error;
> +	}

You shouldn't need to query the compatible string as a property, why is
the code doing this?  You know what compatible was used from probe().