linux-kernel - Re: [PATCH] iio: adc: Add support for TI ADC1x8s102

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Message-ID: <d86de554-eb66-d774-654f-aeaa213597c6@kernel.org>
Date:   Thu, 27 Apr 2017 07:04:36 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] iio: adc: Add support for TI ADC1x8s102

On 27/04/17 07:01, Jonathan Cameron wrote:
> On 26/04/17 10:01, Mika Westerberg wrote:
>> On Tue, Apr 25, 2017 at 06:12:12PM +0200, Jan Kiszka wrote:
>>> Now, do you also a suggestion where to put that 5 V reference voltage
>>> value that is hard-coded (via wiring) on the target boards for the ADC?
>>> That is now device-specific, not a controller parameter. Is there an
>>> ACPI-way to express such a parameter?
>>
>> You may put it into device property using _DSD (as long as you don't try
>> to represent regulators or so).
>>
>>> How would that be done for DTs?
>>
>> I don't know but you may look under Documentation/devicetree/bindings if
>> there is anything.
> Under DT it would be done using a fixed voltage regulator.
Though having actually looked at the driver, you presumably already know this
given you are requesting an appropriate regulator...
>>
>>> Plan B would be hard-coding in the code for now, waiting for a second,
>>> non-ACPI user to address it.
>>
>> Sounds reasonable.
> Somewhat of a pain to basically use a random value as the default going
> forward.  Presumably this isn't the first ever ACPI table to need to
> tell use about a reference voltage...
> 
> Mark, seen anything similar?
> 
> I see https://www.kernel.org/doc/Documentation/arm64/arm-acpi.txt suggests
> that mapping to regulators isn't expected to ever happen...
> 
> Jonathan
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