linux-kernel - Re: Where to update regulator register with initial voltage set by HW

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Message-ID: <20170630104121.rf5nrf3aaqgvmktu@sirena.org.uk>
Date:   Fri, 30 Jun 2017 11:41:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Waldemar Rymarkiewicz <waldemar.rymarkiewicz@...il.com>
Cc:     linux-kernel@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>
Subject: Re: Where to update regulator register with initial voltage set by HW

On Thu, Jun 29, 2017 at 09:18:09AM +0200, Waldemar Rymarkiewicz wrote:

> Initially, on boot, the voltage is set by HW (sensing resistors). When
> OS starts and the reg driver registers regulator with the specific
> constraints uV_min and uV_max, regulator core will apply uV_min or
> uV_max if current (in regulator register) setting is not in the range.
> Normally, by default register holds min(voltage_table) which is
> different than the value set by HW (sensing resistors).

You shoudn't be specfiying a default value for the register, clearly
there is none as it is determined dynamically by the hardware when the
system boots.

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