linux-kernel - Re: [PATCH v2 10/16] iio: adc: sun4i-gpadc-iio: add support for A83T thermal sensor

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Message-ID: <94bc070d-8675-95fe-2857-188f7cc66071@gmail.com>
Date:   Mon, 29 Jan 2018 12:53:48 +0100
From:   Philipp Rossak <embed3d@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        wens@...e.org, linux@...linux.org.uk, jic23@...nel.org,
        knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        davem@...emloft.net, hans.verkuil@...co.com, mchehab@...nel.org,
        rask@...melder.dk, clabbe.montjoie@...il.com, sean@...s.org,
        krzk@...nel.org, quentin.schulz@...e-electrons.com,
        icenowy@...c.io, edu.molinas@...il.com, singhalsimran0@...il.com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 10/16] iio: adc: sun4i-gpadc-iio: add support for A83T
 thermal sensor



On 29.01.2018 10:48, Maxime Ripard wrote:
> On Mon, Jan 29, 2018 at 12:29:13AM +0100, Philipp Rossak wrote:
>> This patch adds support for the A83T ths sensor.
>>
>> The A83T supports interrupts. The interrupt is configured to update the
>> the sensor values every second.
>>
>> Signed-off-by: Philipp Rossak <embed3d@...il.com>
>> ---
>>   drivers/iio/adc/sun4i-gpadc-iio.c | 38 ++++++++++++++++++++++++++++++++++++++
>>   include/linux/mfd/sun4i-gpadc.h   | 18 ++++++++++++++++++
>>   2 files changed, 56 insertions(+)
>>
>> diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
>> index 8196203d65fe..9f7895ba1966 100644
>> --- a/drivers/iio/adc/sun4i-gpadc-iio.c
>> +++ b/drivers/iio/adc/sun4i-gpadc-iio.c
>> @@ -170,6 +170,40 @@ static const struct gpadc_data sun8i_h3_ths_data = {
>>   		SUN8I_H3_THS_TEMP_PERIOD(0x7),
>>   };
>>   
>> +static const struct gpadc_data sun8i_a83t_ths_data = {
>> +	.temp_offset = -2724,
>> +	.temp_scale = -70,
>> +	.temp_data = {SUN8I_H3_THS_TDATA0,
>> +		SUN8I_A83T_THS_TDATA1,
>> +		SUN8I_A83T_THS_TDATA2,
>> +		0},
>> +	.sample_start = sunxi_ths_sample_start,
>> +	.sample_end = sunxi_ths_sample_end,
>> +	.sensor_count = 3,
>> +	.supports_nvmem = false,
>> +	.support_irq = true,
>> +	.ctrl0_map = SUN4I_GPADC_CTRL0_T_ACQ(0x1f3),
>> +	.ctrl2_map = SUN8I_H3_THS_ACQ1(0x1f3),
> 
> Where are these values coming from?
> 

These values are calculated with the formulas from the datasheet and 
also tested on hardware. These settings seem ok.

>> +	.sensor_en_map = SUN8I_H3_THS_TEMP_SENSE_EN0 |
>> +		SUN8I_A83T_THS_TEMP_SENSE_EN1 |
>> +		SUN8I_A83T_THS_TEMP_SENSE_EN2,
>> +	.filter_map = SUN4I_GPADC_CTRL3_FILTER_EN |
>> +		SUN4I_GPADC_CTRL3_FILTER_TYPE(0x2),
>> +	.irq_clear_map = SUN8I_H3_THS_INTS_ALARM_INT_0 |
>> +		SUN8I_A83T_THS_INTS_ALARM_INT_1 |
>> +		SUN8I_A83T_THS_INTS_ALARM_INT_2 |
>> +		SUN8I_H3_THS_INTS_SHUT_INT_0  |
>> +		SUN8I_A83T_THS_INTS_SHUT_INT_1  |
>> +		SUN8I_A83T_THS_INTS_SHUT_INT_2  |
>> +		SUN8I_H3_THS_INTS_TDATA_IRQ_0 |
>> +		SUN8I_A83T_THS_INTS_TDATA_IRQ_1 |
>> +		SUN8I_A83T_THS_INTS_TDATA_IRQ_2,
> 
> Do you reall need to clear all these interrupts if you're using only
> one?
> 

No, I don't think so, I will remove them in the next version.

> Maxime
> 

Philipp