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

From	Waldemar Rymarkiewicz <waldemar.rymarkiewicz@gmail.com>
Newsgroups	linux.kernel
Subject	Re: Where to update regulator register with initial voltage set by HW
Date	2017-06-30 17:30 +0200
Message-ID	<tY61Q-7aE-9@gated-at.bofh.it> (permalink)
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On 30 June 2017 at 14:14, Mark Brown <broonie@kernel.org> wrote:
> On Fri, Jun 30, 2017 at 01:37:32PM +0200, Waldemar Rymarkiewicz wrote:
>
>> I am not sure if I understand. Do you mean, a regulator should
>> determine a voltage and update a register with a right selector when
>> system boots, so the regulator framework reading reg register knows
>> actual voltage?
>
> Just don't provide a default value for the cache, regmap will do a
> physical read if there's nothing in the cache for that register and
> everything will work transparently.

Just want to understand well. "Physical read" means to read a register
value? or determine actual value another way? As Thomas mentioned in
previous email TPS65275 does not have a circuit to determine startup
voltage at least I cannot see this in the datasheet.

Data sheet: http://www.ti.com/lit/gpn/tps65273v

/Waldek

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Thread

Where to update regulator register with initial voltage set by HW Waldemar Rymarkiewicz <waldemar.rymarkiewicz@gmail.com> - 2017-06-29 09:20 +0200
  Re: Where to update regulator register with initial voltage set by HW Mark Brown <broonie@kernel.org> - 2017-06-30 12:50 +0200
    Re: Where to update regulator register with initial voltage set by HW Waldemar Rymarkiewicz <waldemar.rymarkiewicz@gmail.com> - 2017-06-30 13:40 +0200
      Re: Where to update regulator register with initial voltage set by HW Mark Brown <broonie@kernel.org> - 2017-06-30 14:20 +0200
        RE: Where to update regulator register with initial voltage set by  HW "Bartholomae, Thomas" <t.bartholomae@intel.com> - 2017-06-30 14:30 +0200
        Re: Where to update regulator register with initial voltage set by HW Waldemar Rymarkiewicz <waldemar.rymarkiewicz@gmail.com> - 2017-06-30 17:30 +0200

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