[PATCH 3/9] regulator: core: Try full range when adjusting regulators to constraints

Mark Brown broonie at kernel.org
Mon Aug 22 11:09:32 PDT 2016

On Mon, Aug 22, 2016 at 07:52:05PM +0200, Rask Ingemann Lambertsen wrote:
> On Mon, Aug 22, 2016 at 05:29:07PM +0100, Mark Brown wrote:

> > This seems like you have buggy constraints, constraints which allow
> > voltages that can't physically be satisfied don't make obvious sense.

> No, it's for cases like this (see the cubietruck4 or a80-optimus dts
> patches):

> 			reg_bldo4: bldo4 {
> 				regulator-min-microvolt = <1080000>;
> 				regulator-max-microvolt = <1320000>;
> 				regulator-name = "vcc12-hsic";
> 			};

> The regulator can do 1100000 uV, 1200000 uV and 1300000 uV, all of which
> are within the constraints, so obviously the constraints can be satisfied,
> yet the regulator core fails do so with a message like this:

Sure, but the constraints also say that you can do 1.32V which the
system is not physically capable of delivering.  That's not a good sign
for the constraints, it suggests that at least the capabilities of the
regulator have not been taken into consideration when setting up the
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