From: Claudiu Beznea <claudiu.beznea@microchip.com>
To: <eugen.hristev@microchip.com>, <jic23@kernel.org>,
<lars@metafoo.de>, <nicolas.ferre@microchip.com>,
<alexandre.belloni@bootlin.com>,
<ludovic.desroches@microchip.com>, <robh+dt@kernel.org>
Cc: <linux-iio@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
Claudiu Beznea <claudiu.beznea@microchip.com>
Subject: [PATCH v3 11/19] iio: adc: at91-sama5d2_adc: add 64 and 256 oversampling ratio
Date: Wed, 3 Aug 2022 13:28:47 +0300 [thread overview]
Message-ID: <20220803102855.2191070-12-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <20220803102855.2191070-1-claudiu.beznea@microchip.com>
Add 64 and 256 oversampling ratio support. It is necessary for temperature
sensor.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
Changes in v3:
- adapt to changes on patch 10/19
drivers/iio/adc/at91-sama5d2_adc.c | 31 +++++++++++++++++++++++++-----
1 file changed, 26 insertions(+), 5 deletions(-)
diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index db9d77385149..d6a93aa7fbaf 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -142,6 +142,8 @@ struct at91_adc_reg_layout {
#define AT91_SAMA5D2_EMR_OSR_1SAMPLES 0
#define AT91_SAMA5D2_EMR_OSR_4SAMPLES 1
#define AT91_SAMA5D2_EMR_OSR_16SAMPLES 2
+#define AT91_SAMA5D2_EMR_OSR_64SAMPLES 3
+#define AT91_SAMA5D2_EMR_OSR_256SAMPLES 4
/* Extended Mode Register - Averaging on single trigger event */
#define AT91_SAMA5D2_EMR_ASTE(V) ((V) << 20)
@@ -421,7 +423,7 @@ struct at91_adc_platform {
unsigned int max_index;
unsigned int hw_trig_cnt;
unsigned int osr_mask;
- unsigned int oversampling_avail[3];
+ unsigned int oversampling_avail[5];
unsigned int oversampling_avail_no;
unsigned int chan_realbits;
};
@@ -642,8 +644,8 @@ static const struct at91_adc_platform sama7g5_platform = {
#define AT91_SAMA7G5_HW_TRIG_CNT 3
.hw_trig_cnt = AT91_SAMA7G5_HW_TRIG_CNT,
.osr_mask = GENMASK(18, 16),
- .oversampling_avail = { 1, 4, 16, },
- .oversampling_avail_no = 3,
+ .oversampling_avail = { 1, 4, 16, 64, 256, },
+ .oversampling_avail_no = 5,
.chan_realbits = 16,
};
@@ -749,6 +751,15 @@ static int at91_adc_config_emr(struct at91_adc_state *st,
/* configure the extended mode register */
unsigned int emr = at91_adc_readl(st, EMR);
unsigned int osr_mask = st->soc_info.platform->osr_mask;
+ int i;
+
+ /* Check against supported oversampling values. */
+ for (i = 0; i < st->soc_info.platform->oversampling_avail_no; i++) {
+ if (oversampling_ratio == st->soc_info.platform->oversampling_avail[i])
+ break;
+ }
+ if (i == st->soc_info.platform->oversampling_avail_no)
+ return -EINVAL;
/* select oversampling per single trigger event */
emr |= AT91_SAMA5D2_EMR_ASTE(1);
@@ -770,8 +781,14 @@ static int at91_adc_config_emr(struct at91_adc_state *st,
emr |= AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_16SAMPLES,
osr_mask);
break;
- default:
- return -EINVAL;
+ case 64:
+ emr |= AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_64SAMPLES,
+ osr_mask);
+ break;
+ case 256:
+ emr |= AT91_SAMA5D2_EMR_OSR(AT91_SAMA5D2_EMR_OSR_256SAMPLES,
+ osr_mask);
+ break;
}
at91_adc_writel(st, EMR, emr);
@@ -789,6 +806,10 @@ static int at91_adc_adjust_val_osr(struct at91_adc_state *st, int *val)
nbits = 13;
else if (st->oversampling_ratio == 16)
nbits = 14;
+ else if (st->oversampling_ratio == 64)
+ nbits = 15;
+ else if (st->oversampling_ratio == 256)
+ nbits = 16;
else
/* Should not happen. */
return -EINVAL;
--
2.34.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-08-03 10:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-03 10:28 [PATCH v3 00/19] iio: adc: at91-sama5d2_adc: add support for temperature sensor Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 01/19] iio: adc: at91-sama5d2_adc: fix AT91_SAMA5D2_MR_TRACKTIM_MAX Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 02/19] iio: adc: at91-sama5d2_adc: check return status for pressure and touch Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 03/19] iio: adc: at91-sama5d2_adc: lock around oversampling and sample freq Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 04/19] iio: adc: at91-sama5d2_adc: disable/prepare buffer on suspend/resume Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 05/19] iio: adc: at91-sama5d2_adc: exit from write_raw() when buffers are enabled Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 06/19] iio: adc: at91-sama5d2_adc: handle different EMR.OSR for different hw versions Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 07/19] iio: adc: at91-sama5d2_adc: move the check of oversampling in its function Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 08/19] iio: adc: at91-sama5d2_adc: drop AT91_OSR_XSAMPLES defines Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 09/19] iio: adc: at91-sama5d2_adc: add .read_avail() chan_info ops Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 10/19] iio: adc: at91-sama5d2_adc: adjust osr based on specific platform data Claudiu Beznea
2022-08-03 10:28 ` Claudiu Beznea [this message]
2022-08-03 10:28 ` [PATCH v3 12/19] iio: adc: at91-sama5d2_adc: move oversampling storage in its function Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 13/19] iio: adc: at91-sama5d2_adc: update trackx on emr Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 14/19] iio: adc: at91-sama5d2_adc: add startup and tracktim as parameter for at91_adc_setup_samp_freq() Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 15/19] iio: adc: at91-sama5d2_adc: lock around at91_adc_read_info_raw() Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 16/19] dt-bindings: iio: adc: at91-sama5d2_adc: add id for temperature channel Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 17/19] iio: adc: at91-sama5d2_adc: add support for temperature sensor Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 18/19] iio: adc: at91-sama5d2_adc: add empty line after functions Claudiu Beznea
2022-08-03 10:28 ` [PATCH v3 19/19] iio: adc: at91-sama5d2_adc: add runtime pm support Claudiu Beznea
2022-08-06 14:10 ` [PATCH v3 00/19] iio: adc: at91-sama5d2_adc: add support for temperature sensor Jonathan Cameron
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220803102855.2191070-12-claudiu.beznea@microchip.com \
--to=claudiu.beznea@microchip.com \
--cc=alexandre.belloni@bootlin.com \
--cc=devicetree@vger.kernel.org \
--cc=eugen.hristev@microchip.com \
--cc=jic23@kernel.org \
--cc=lars@metafoo.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=ludovic.desroches@microchip.com \
--cc=nicolas.ferre@microchip.com \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox