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iio: adc: at91-sama5d2_adc: add startup and tracktim as parameter for at91_adc_setup_samp_freq()

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Add startup and tracktim as parameter for at91_adc_setup_samp_freq()
function. In case of temperature sensor being enabled these parameters
will be configured on temperature read request to improve the accuracy
of the read temperature.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220803102855.2191070-15-claudiu.beznea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Claudiu Beznea
2022-08-03 13:28:50 +03:00
committed by Jonathan Cameron
parent 04227f9510
commit 5f72666f4b
1 changed files with 11 additions and 7 deletions
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18
drivers/iio/adc/at91-sama5d2_adc.c
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@@ -1435,7 +1435,9 @@ static unsigned at91_adc_startup_time(unsigned startup_time_min,
return i;
}
static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, unsigned freq)
static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, unsigned freq,
unsigned int startup_time,
unsigned int tracktim)
{
struct at91_adc_state *st = iio_priv(indio_dev);
unsigned f_per, prescal, startup, mr;
@@ -1443,17 +1445,17 @@ static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, unsigned freq)
f_per = clk_get_rate(st->per_clk);
prescal = (f_per / (2 * freq)) - 1;
startup = at91_adc_startup_time(st->soc_info.startup_time,
freq / 1000);
startup = at91_adc_startup_time(startup_time, freq / 1000);
mr = at91_adc_readl(st, MR);
mr &= ~(AT91_SAMA5D2_MR_STARTUP_MASK | AT91_SAMA5D2_MR_PRESCAL_MASK);
mr |= AT91_SAMA5D2_MR_STARTUP(startup);
mr |= AT91_SAMA5D2_MR_PRESCAL(prescal);
mr |= AT91_SAMA5D2_MR_TRACKTIM(tracktim);
at91_adc_writel(st, MR, mr);
dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u\n",
freq, startup, prescal);
dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u, tracktim=%u\n",
freq, startup, prescal, tracktim);
st->current_sample_rate = freq;
}
@@ -1725,7 +1727,8 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev,
if (ret)
return ret;
mutex_lock(&st->lock);
at91_adc_setup_samp_freq(indio_dev, val);
at91_adc_setup_samp_freq(indio_dev, val,
st->soc_info.startup_time, 0);
mutex_unlock(&st->lock);
iio_device_release_direct_mode(indio_dev);
return 0;
@@ -1907,7 +1910,8 @@ static void at91_adc_hw_init(struct iio_dev *indio_dev)
at91_adc_writel(st, MR,
AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate);
at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate,
st->soc_info.startup_time, 0);
/* configure extended mode register */
at91_adc_config_emr(st, st->oversampling_ratio, 0);