[U-Boot, 3/3] pmic: allow dump command for non contiguous register maps

[Tom Rini]

On Tue, Jan 14, 2020 at 03:56:18PM +0000, Ian Ray wrote:

> From: Martin Fuzzey <martin.fuzzey at flowbird.group>
> 
> Some PMICs (such as the DA9063) have non-contiguous register maps.
> Attempting to read the non implemented registers returns an error
> rather than a dummy value which causes 'pmic dump' to terminate
> prematurely.
> 
> Fix this by allowing the PMIC driver to return -ENODATA for such
> registers, which will then be displayed as '--' by pmic dump.
> 
> Use a single error code rather than any error code so that
> we can distinguish between a hardware failure reading the PMIC
> and a non implemented register known to the driver.
> 
> Signed-off-by: Martin Fuzzey <martin.fuzzey at flowbird.group>

Applied to u-boot/master, thanks!

-- 
Tom
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