Message-ID: <52040DE2.50201@roeck-us.net>
Date: Thu, 08 Aug 2013 14:30:10 -0700
From: Guenter Roeck <linux@roeck-us.net>
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To: Mark Brown <broonie@kernel.org>
CC: Wei Ni <wni@nvidia.com>, swarren@wwwdotorg.org,
        linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org,
        linux-tegra@vger.kernel.org, MLongnecker@nvidia.com,
        khali@linux-fr.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 1/3] hwmon: (lm90) Add power control
References: <1375944991-29182-1-git-send-email-wni@nvidia.com> <1375944991-29182-2-git-send-email-wni@nvidia.com> <20130808110136.GA6427@sirena.org.uk> <52038035.7030803@roeck-us.net> <20130808130840.GC6427@sirena.org.uk> <5203B78C.7010101@roeck-us.net> <20130808171554.GI6427@sirena.org.uk> <20130808200026.GA18226@roeck-us.net> <20130808211825.GN6427@sirena.org.uk>
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On 08/08/2013 02:18 PM, Mark Brown wrote:
> On Thu, Aug 08, 2013 at 01:00:26PM -0700, Guenter Roeck wrote:
>> On Thu, Aug 08, 2013 at 06:15:54PM +0100, Mark Brown wrote:
>
>>> Sure, that's the transition issues I mentioned - the regulator API does
>>> have stubbing facilities which should cover things and it's very easy to
>>> define stub regulators if you need to.  Like I say I expect this to be a
>>> lot easier after the next merge window as another way of doing stubs is
>>> being added which should make this even easier by avoiding disrupting
>>> drivers that do genuinely want to check for absent supplies and handle
>>> that better.
>
>> We will need to make sure that all dts files using any of the compatible chips
>> are updated accordingly. There are several entries in various dts files for
>> adm1032, adt7461, lm90, and nct1008.
>
> Yes, and probably also board files as well.  Or either just accept
> bisection trouble for now or wait till the better stubbing is in there -

Ah, that is exactly the trouble I wanted to avoid.

> that will mean that for DT systems the core will just assume the supply
> is really there and not fail requests if it's not in the DT.
>
>>> The names requested by a driver are defined with regard to the device
>>> and should be the names used by the chip itself as defined in the
>
>> 9 votes for vdd, 11 votes for vcc, one undecided (no datasheet available).
>> Guess one is as good as the other ;-).
>
> What I've suggested before is to use the name from the part for which
> the driver is named.  Assuming the vendor doesn't randomly change their
> datasheet (but that causes problems for hardware engineers so tends to
> be avoided).
>
Makes sense.

Guenter

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