From 04227f9510799b8f15fc9dcc30e12ed503bb3183 Mon Sep 17 00:00:00 2001 From: Claudiu Beznea Date: Wed, 3 Aug 2022 13:28:49 +0300 Subject: [PATCH] iio: adc: at91-sama5d2_adc: update trackx on emr Add support for updating trackx bits of EMR register. Having different values of EMR.TRACKX when measuring temperature give a better accuracy. Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/20220803102855.2191070-14-claudiu.beznea@microchip.com Signed-off-by: Jonathan Cameron --- drivers/iio/adc/at91-sama5d2_adc.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c index a1df475..0209353 100644 --- a/drivers/iio/adc/at91-sama5d2_adc.c +++ b/drivers/iio/adc/at91-sama5d2_adc.c @@ -145,6 +145,10 @@ struct at91_adc_reg_layout { #define AT91_SAMA5D2_EMR_OSR_64SAMPLES 3 #define AT91_SAMA5D2_EMR_OSR_256SAMPLES 4 +/* Extended Mode Register - TRACKX */ +#define AT91_SAMA5D2_TRACKX_MASK GENMASK(23, 22) +#define AT91_SAMA5D2_TRACKX(x) (((x) << 22) & \ + AT91_SAMA5D2_TRACKX_MASK) /* Extended Mode Register - Averaging on single trigger event */ #define AT91_SAMA5D2_EMR_ASTE(V) ((V) << 20) @@ -746,7 +750,7 @@ static void at91_adc_eoc_ena(struct at91_adc_state *st, unsigned int channel) } static int at91_adc_config_emr(struct at91_adc_state *st, - u32 oversampling_ratio) + u32 oversampling_ratio, u32 trackx) { /* configure the extended mode register */ unsigned int emr = at91_adc_readl(st, EMR); @@ -765,7 +769,7 @@ static int at91_adc_config_emr(struct at91_adc_state *st, emr |= AT91_SAMA5D2_EMR_ASTE(1); /* delete leftover content if it's the case */ - emr &= ~osr_mask; + emr &= ~(osr_mask | AT91_SAMA5D2_TRACKX_MASK); /* select oversampling ratio from configuration */ switch (oversampling_ratio) { @@ -791,6 +795,8 @@ static int at91_adc_config_emr(struct at91_adc_state *st, break; } + /* Update trackx. */ + emr |= AT91_SAMA5D2_TRACKX(trackx); at91_adc_writel(st, EMR, emr); st->oversampling_ratio = oversampling_ratio; @@ -1706,7 +1712,7 @@ static int at91_adc_write_raw(struct iio_dev *indio_dev, return ret; mutex_lock(&st->lock); /* update ratio */ - ret = at91_adc_config_emr(st, val); + ret = at91_adc_config_emr(st, val, 0); mutex_unlock(&st->lock); iio_device_release_direct_mode(indio_dev); return ret; @@ -1904,7 +1910,7 @@ static void at91_adc_hw_init(struct iio_dev *indio_dev) at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate); /* configure extended mode register */ - at91_adc_config_emr(st, st->oversampling_ratio); + at91_adc_config_emr(st, st->oversampling_ratio, 0); } static ssize_t at91_adc_get_fifo_state(struct device *dev, -- 2.7.4