linux-kernel - Re: [PATCH v3 2/3] iio: adc128s052: add ACPI

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Message-ID: <20181026121228.GE10650@smile.fi.intel.com>
Date:   Fri, 26 Oct 2018 15:12:28 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Dan O'Donovan <dan@...tex.com>
Cc:     linux-kernel@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Carlos Iglesias <carlos.iglesias@...tex.com>,
        Nicola Lunghi <nicola.lunghi@...tex.com>,
        Javier Arteaga <javier@...tex.com>
Subject: Re: [PATCH v3 2/3] iio: adc128s052: add ACPI _HID AANT1280

On Fri, Oct 26, 2018 at 11:13:01AM +0100, Dan O'Donovan wrote:
> On 10/25/2018 06:46 PM, Andy Shevchenko wrote:
> > On Thu, Oct 25, 2018 at 04:35:41PM +0100, Dan O'Donovan wrote:

> >> +	{ "AANT1280", 2 }, /* ADC124S021 compatible ACPI ID */

> > Looking how driver is organized and what ACPI can provide I would highly
> > recommend to look forward to PTYP field for utilization of the type of the HW.

> > Maybe it would not work with published BIOSes, but would be good for the future
> > (in that case anybody can utilize that _HID + PTYP pair on their platforms).

> Thanks Andy for your review and feedback.  Your _HID + PTYP suggestion sounds
> interesting, but I couldn't find any information in the ACPI spec or elsewhere
> about how/when/where to use it.  

I stand corrected, it's not in the spec, rather de facto use of it in some
cases, see below.

> It isn't used in the UP Squared ACPI tables.
> Do you have any links or other information you could share about it? Thanks!

As far as I can find the following code in the kernel and thus real ACPI tables
in the wild that utilize it.

drivers/acpi/dptf/dptf_power.c:84:      status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
drivers/platform/x86/intel_cht_int33fe.c:101:   status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
drivers/thermal/int340x_thermal/int3403_thermal.c:237:  status = acpi_evaluate_integer(priv->adev->handle, "PTYP",


-- 
With Best Regards,
Andy Shevchenko