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Message-ID: <81370b043de208795738e5679c33de37439c0a2e.1731626099.git.marcelo.schmitt@analog.com>
Date: Thu, 14 Nov 2024 20:51:16 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
<marcelo.schmitt@...log.com>, <jic23@...nel.org>, <robh@...nel.org>,
<krzk+dt@...nel.org>, <conor+dt@...nel.org>,
<marcelo.schmitt1@...il.com>
CC: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH 3/4] iio: adc: ad4000: Use device specific timing for SPI transfers
The SPI transfers for AD4020, AD4021, and AD4022 have slightly different
timing specifications. Use device specific timing constraints to set SPI
transfer parameters.
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
drivers/iio/adc/ad4000.c | 50 ++++++++++++++++++++++++++++++++--------
1 file changed, 41 insertions(+), 9 deletions(-)
diff --git a/drivers/iio/adc/ad4000.c b/drivers/iio/adc/ad4000.c
index 21731c4d31ee..68ac77494263 100644
--- a/drivers/iio/adc/ad4000.c
+++ b/drivers/iio/adc/ad4000.c
@@ -35,10 +35,6 @@
#define AD4000_SCALE_OPTIONS 2
-#define AD4000_TQUIET1_NS 190
-#define AD4000_TQUIET2_NS 60
-#define AD4000_TCONV_NS 320
-
#define __AD4000_DIFF_CHANNEL(_sign, _real_bits, _storage_bits, _reg_access) \
{ \
.type = IIO_VOLTAGE, \
@@ -122,10 +118,30 @@ static const int ad4000_gains[] = {
454, 909, 1000, 1900,
};
+struct ad4000_time_spec {
+ int t_conv_ns;
+ int t_quiet2_ns;
+};
+
+/*
+ * Same timing specifications for all of AD4000, AD4001, ..., AD4008, AD4010,
+ * ADAQ4001, and ADAQ4003.
+ */
+static const struct ad4000_time_spec ad4000_t_spec = {
+ .t_conv_ns = 320,
+ .t_quiet2_ns = 60,
+};
+
+static const struct ad4000_time_spec ad4020_t_spec = {
+ .t_conv_ns = 350,
+ .t_quiet2_ns = 60,
+};
+
struct ad4000_chip_info {
const char *dev_name;
struct iio_chan_spec chan_spec[2];
struct iio_chan_spec reg_access_chan_spec[2];
+ const struct ad4000_time_spec *time_spec;
bool has_hardware_gain;
};
@@ -133,90 +149,105 @@ static const struct ad4000_chip_info ad4000_chip_info = {
.dev_name = "ad4000",
.chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 16, 0),
.reg_access_chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 16, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4001_chip_info = {
.dev_name = "ad4001",
.chan_spec = AD4000_DIFF_CHANNELS('s', 16, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 16, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4002_chip_info = {
.dev_name = "ad4002",
.chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 18, 0),
.reg_access_chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 18, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4003_chip_info = {
.dev_name = "ad4003",
.chan_spec = AD4000_DIFF_CHANNELS('s', 18, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 18, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4004_chip_info = {
.dev_name = "ad4004",
.chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 16, 0),
.reg_access_chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 16, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4005_chip_info = {
.dev_name = "ad4005",
.chan_spec = AD4000_DIFF_CHANNELS('s', 16, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 16, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4006_chip_info = {
.dev_name = "ad4006",
.chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 18, 0),
.reg_access_chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 18, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4007_chip_info = {
.dev_name = "ad4007",
.chan_spec = AD4000_DIFF_CHANNELS('s', 18, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 18, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4008_chip_info = {
.dev_name = "ad4008",
.chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 16, 0),
.reg_access_chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 16, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4010_chip_info = {
.dev_name = "ad4010",
.chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 18, 0),
.reg_access_chan_spec = AD4000_PSEUDO_DIFF_CHANNELS('u', 18, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4011_chip_info = {
.dev_name = "ad4011",
.chan_spec = AD4000_DIFF_CHANNELS('s', 18, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 18, 1),
+ .time_spec = &ad4000_t_spec,
};
static const struct ad4000_chip_info ad4020_chip_info = {
.dev_name = "ad4020",
.chan_spec = AD4000_DIFF_CHANNELS('s', 20, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 20, 1),
+ .time_spec = &ad4020_t_spec,
};
static const struct ad4000_chip_info ad4021_chip_info = {
.dev_name = "ad4021",
.chan_spec = AD4000_DIFF_CHANNELS('s', 20, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 20, 1),
+ .time_spec = &ad4020_t_spec,
};
static const struct ad4000_chip_info ad4022_chip_info = {
.dev_name = "ad4022",
.chan_spec = AD4000_DIFF_CHANNELS('s', 20, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 20, 1),
+ .time_spec = &ad4020_t_spec,
};
static const struct ad4000_chip_info adaq4001_chip_info = {
.dev_name = "adaq4001",
.chan_spec = AD4000_DIFF_CHANNELS('s', 16, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 16, 1),
+ .time_spec = &ad4000_t_spec,
.has_hardware_gain = true,
};
@@ -224,6 +255,7 @@ static const struct ad4000_chip_info adaq4003_chip_info = {
.dev_name = "adaq4003",
.chan_spec = AD4000_DIFF_CHANNELS('s', 18, 0),
.reg_access_chan_spec = AD4000_DIFF_CHANNELS('s', 18, 1),
+ .time_spec = &ad4000_t_spec,
.has_hardware_gain = true,
};
@@ -238,6 +270,7 @@ struct ad4000_state {
bool span_comp;
u16 gain_milli;
int scale_tbl[AD4000_SCALE_OPTIONS][2];
+ const struct ad4000_time_spec *time_spec;
/*
* DMA (thus cache coherency maintenance) requires the transfer buffers
@@ -502,16 +535,15 @@ static const struct iio_info ad4000_info = {
static int ad4000_prepare_3wire_mode_message(struct ad4000_state *st,
const struct iio_chan_spec *chan)
{
- unsigned int cnv_pulse_time = AD4000_TCONV_NS;
struct spi_transfer *xfers = st->xfers;
xfers[0].cs_change = 1;
- xfers[0].cs_change_delay.value = cnv_pulse_time;
+ xfers[0].cs_change_delay.value = st->time_spec->t_conv_ns;
xfers[0].cs_change_delay.unit = SPI_DELAY_UNIT_NSECS;
xfers[1].rx_buf = &st->scan.data;
xfers[1].len = BITS_TO_BYTES(chan->scan_type.storagebits);
- xfers[1].delay.value = AD4000_TQUIET2_NS;
+ xfers[1].delay.value = st->time_spec->t_quiet2_ns;
xfers[1].delay.unit = SPI_DELAY_UNIT_NSECS;
spi_message_init_with_transfers(&st->msg, st->xfers, 2);
@@ -529,7 +561,6 @@ static int ad4000_prepare_3wire_mode_message(struct ad4000_state *st,
static int ad4000_prepare_4wire_mode_message(struct ad4000_state *st,
const struct iio_chan_spec *chan)
{
- unsigned int cnv_to_sdi_time = AD4000_TCONV_NS;
struct spi_transfer *xfers = st->xfers;
/*
@@ -537,7 +568,7 @@ static int ad4000_prepare_4wire_mode_message(struct ad4000_state *st,
* going low.
*/
xfers[0].cs_off = 1;
- xfers[0].delay.value = cnv_to_sdi_time;
+ xfers[0].delay.value = st->time_spec->t_conv_ns;
xfers[0].delay.unit = SPI_DELAY_UNIT_NSECS;
xfers[1].rx_buf = &st->scan.data;
@@ -576,6 +607,7 @@ static int ad4000_probe(struct spi_device *spi)
st = iio_priv(indio_dev);
st->spi = spi;
+ st->time_spec = chip->time_spec;
ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(ad4000_power_supplies),
ad4000_power_supplies);
--
2.45.2
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