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

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Date:   Fri, 26 Oct 2018 11:13:01 +0100
From:   Dan O'Donovan <dan@...tex.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.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 10/25/2018 06:46 PM, Andy Shevchenko wrote:
> On Thu, Oct 25, 2018 at 04:35:41PM +0100, Dan O'Donovan wrote:
>> From: Nicola Lunghi <nicola.lunghi@...tex.com>
>>
>> ACPI _HID AANT1280 matches an ADC124S101 present on E3940 SKUs of the UP
>> Squared board.
>>
>> Add it to the driver.
>>
>> Signed-off-by: Nicola Lunghi <nicola.lunghi@...tex.com>
>> [javier@...tex.com: fix up commit message and one checkpatch warning]
>> Signed-off-by: Javier Arteaga <javier@...tex.com>
>> Signed-off-by: Dan O'Donovan <dan@...tex.com>
>> ---
>>  drivers/iio/adc/ti-adc128s052.c | 18 +++++++++++++++++-
>>  1 file changed, 17 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
>> index e6716c3..c2d1453 100644
>> --- a/drivers/iio/adc/ti-adc128s052.c
>> +++ b/drivers/iio/adc/ti-adc128s052.c
>> @@ -12,10 +12,12 @@
>>   * published by the Free Software Foundation.
>>   */
>>  
>> +#include <linux/acpi.h>
>>  #include <linux/err.h>
>>  #include <linux/spi/spi.h>
>>  #include <linux/module.h>
>>  #include <linux/iio/iio.h>
>> +#include <linux/property.h>
>>  #include <linux/regulator/consumer.h>
>>  
>>  struct adc128_configuration {
>> @@ -135,10 +137,15 @@ static const struct iio_info adc128_info = {
>>  static int adc128_probe(struct spi_device *spi)
>>  {
>>  	struct iio_dev *indio_dev;
>> +	unsigned int config;
>>  	struct adc128 *adc;
>> -	int config = spi_get_device_id(spi)->driver_data;
>>  	int ret;
>>  
>> +	if (dev_fwnode(&spi->dev))
>> +		config = (unsigned long) device_get_match_data(&spi->dev);
>> +	else
>> +		config = spi_get_device_id(spi)->driver_data;
>> +
>>  	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
>>  	if (!indio_dev)
>>  		return -ENOMEM;
>> @@ -207,10 +214,19 @@ static const struct spi_device_id adc128_id[] = {
>>  };
>>  MODULE_DEVICE_TABLE(spi, adc128_id);
>>  
>> +#ifdef CONFIG_ACPI
>> +static const struct acpi_device_id adc128_acpi_match[] = {
> 
>> +	{ "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.  It isn't used in the UP Squared ACPI tables.
Do you have any links or other information you could share about it? Thanks!

>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(acpi, adc128_acpi_match);
>> +#endif
>> +
>>  static struct spi_driver adc128_driver = {
>>  	.driver = {
>>  		.name = "adc128s052",
> 
>>  		.of_match_table = of_match_ptr(adc128_of_match),
>> +		.acpi_match_table = ACPI_PTR(adc128_acpi_match),
>>  	},
>>  	.probe = adc128_probe,
>>  	.remove = adc128_remove,
>> -- 
>> 2.7.4
>>
>>
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> 

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