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path: root/drivers/iio/frequency/adf4371.c
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Diffstat (limited to 'drivers/iio/frequency/adf4371.c')
-rw-r--r--drivers/iio/frequency/adf4371.c108
1 files changed, 72 insertions, 36 deletions
diff --git a/drivers/iio/frequency/adf4371.c b/drivers/iio/frequency/adf4371.c
index b27088464826..d6dc7827fb41 100644
--- a/drivers/iio/frequency/adf4371.c
+++ b/drivers/iio/frequency/adf4371.c
@@ -4,6 +4,7 @@
*
* Copyright 2019 Analog Devices Inc.
*/
+#include "linux/dev_printk.h"
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/device.h>
@@ -41,6 +42,12 @@
#define ADF4371_MOD2WORD_MSK GENMASK(5, 0)
#define ADF4371_MOD2WORD(x) FIELD_PREP(ADF4371_MOD2WORD_MSK, x)
+/* ADF4371_REG22 */
+#define ADF4371_REFIN_MODE_MASK BIT(6)
+#define ADF4371_REFIN_MODE(x) FIELD_PREP(ADF4371_REFIN_MODE_MASK, x)
+#define ADF4371_REF_DOUB_MASK BIT(5)
+#define ADF4371_REF_DOUB(x) FIELD_PREP(ADF4371_REF_DOUB_MASK, x)\
+
/* ADF4371_REG24 */
#define ADF4371_RF_DIV_SEL_MSK GENMASK(6, 4)
#define ADF4371_RF_DIV_SEL(x) FIELD_PREP(ADF4371_RF_DIV_SEL_MSK, x)
@@ -69,6 +76,10 @@
#define ADF4371_MAX_FREQ_PFD 250000000UL /* Hz */
#define ADF4371_MAX_FREQ_REFIN 600000000UL /* Hz */
+#define ADF4371_MAX_FREQ_REFIN_SE 500000000UL /* Hz */
+
+#define ADF4371_MIN_CLKIN_DOUB_FREQ 10000000ULL /* Hz */
+#define ADF4371_MAX_CLKIN_DOUB_FREQ 125000000ULL /* Hz */
/* MOD1 is a 24-bit primary modulus with fixed value of 2^25 */
#define ADF4371_MODULUS1 33554432ULL
@@ -150,6 +161,7 @@ static const struct regmap_config adf4371_regmap_config = {
};
struct adf4371_chip_info {
+ const char *name;
unsigned int num_channels;
const struct iio_chan_spec *channels;
};
@@ -157,7 +169,6 @@ struct adf4371_chip_info {
struct adf4371_state {
struct spi_device *spi;
struct regmap *regmap;
- struct clk *clkin;
/*
* Lock for accessing device registers. Some operations require
* multiple consecutive R/W operations, during which the device
@@ -175,6 +186,7 @@ struct adf4371_state {
unsigned int mod2;
unsigned int rf_div_sel;
unsigned int ref_div_factor;
+ bool ref_diff_en;
u8 buf[10] __aligned(IIO_DMA_MINALIGN);
};
@@ -426,7 +438,7 @@ static const struct iio_chan_spec_ext_info adf4371_ext_info[] = {
_ADF4371_EXT_INFO("frequency", ADF4371_FREQ),
_ADF4371_EXT_INFO("powerdown", ADF4371_POWER_DOWN),
_ADF4371_EXT_INFO("name", ADF4371_CHANNEL_NAME),
- { },
+ { }
};
#define ADF4371_CHANNEL(index) { \
@@ -444,15 +456,16 @@ static const struct iio_chan_spec adf4371_chan[] = {
ADF4371_CHANNEL(ADF4371_CH_RF32),
};
-static const struct adf4371_chip_info adf4371_chip_info[] = {
- [ADF4371] = {
- .channels = adf4371_chan,
- .num_channels = 4,
- },
- [ADF4372] = {
- .channels = adf4371_chan,
- .num_channels = 3,
- }
+static const struct adf4371_chip_info adf4371_chip_info = {
+ .name = "adf4371",
+ .channels = adf4371_chan,
+ .num_channels = 4,
+};
+
+static const struct adf4371_chip_info adf4372_chip_info = {
+ .name = "adf4372",
+ .channels = adf4371_chan,
+ .num_channels = 3,
};
static int adf4371_reg_access(struct iio_dev *indio_dev,
@@ -475,7 +488,7 @@ static const struct iio_info adf4371_info = {
static int adf4371_setup(struct adf4371_state *st)
{
unsigned int synth_timeout = 2, timeout = 1, vco_alc_timeout = 1;
- unsigned int vco_band_div, tmp;
+ unsigned int vco_band_div, tmp, ref_doubler_en = 0;
int ret;
/* Perform a software reset */
@@ -503,6 +516,23 @@ static int adf4371_setup(struct adf4371_state *st)
ADF4371_ADDR_ASC(1) | ADF4371_ADDR_ASC_R(1));
if (ret < 0)
return ret;
+
+ if ((st->ref_diff_en && st->clkin_freq > ADF4371_MAX_FREQ_REFIN) ||
+ (!st->ref_diff_en && st->clkin_freq > ADF4371_MAX_FREQ_REFIN_SE))
+ return -EINVAL;
+
+ if (st->clkin_freq < ADF4371_MAX_CLKIN_DOUB_FREQ &&
+ st->clkin_freq > ADF4371_MIN_CLKIN_DOUB_FREQ)
+ ref_doubler_en = 1;
+
+ ret = regmap_update_bits(st->regmap, ADF4371_REG(0x22),
+ ADF4371_REF_DOUB_MASK |
+ ADF4371_REFIN_MODE_MASK,
+ ADF4371_REF_DOUB(ref_doubler_en) |
+ ADF4371_REFIN_MODE(st->ref_diff_en));
+ if (ret < 0)
+ return ret;
+
/*
* Calculate and maximize PFD frequency
* fPFD = REFIN × ((1 + D)/(R × (1 + T)))
@@ -512,7 +542,8 @@ static int adf4371_setup(struct adf4371_state *st)
*/
do {
st->ref_div_factor++;
- st->fpfd = st->clkin_freq / st->ref_div_factor;
+ st->fpfd = st->clkin_freq * (1 + ref_doubler_en) /
+ st->ref_div_factor;
} while (st->fpfd > ADF4371_MAX_FREQ_PFD);
/* Calculate Timeouts */
@@ -542,10 +573,10 @@ static int adf4371_setup(struct adf4371_state *st)
static int adf4371_probe(struct spi_device *spi)
{
- const struct spi_device_id *id = spi_get_device_id(spi);
struct iio_dev *indio_dev;
struct adf4371_state *st;
struct regmap *regmap;
+ struct clk *clkin;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
@@ -553,51 +584,56 @@ static int adf4371_probe(struct spi_device *spi)
return -ENOMEM;
regmap = devm_regmap_init_spi(spi, &adf4371_regmap_config);
- if (IS_ERR(regmap)) {
- dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
- PTR_ERR(regmap));
- return PTR_ERR(regmap);
- }
+ if (IS_ERR(regmap))
+ return dev_err_probe(&spi->dev, PTR_ERR(regmap),
+ "Error initializing spi regmap\n");
st = iio_priv(indio_dev);
- spi_set_drvdata(spi, indio_dev);
st->spi = spi;
st->regmap = regmap;
mutex_init(&st->lock);
- st->chip_info = &adf4371_chip_info[id->driver_data];
- indio_dev->name = id->name;
+ st->chip_info = spi_get_device_match_data(spi);
+ if (!st->chip_info)
+ return -ENODEV;
+
+ indio_dev->name = st->chip_info->name;
indio_dev->info = &adf4371_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = st->chip_info->num_channels;
- st->clkin = devm_clk_get_enabled(&spi->dev, "clkin");
- if (IS_ERR(st->clkin))
- return PTR_ERR(st->clkin);
+ st->ref_diff_en = false;
- st->clkin_freq = clk_get_rate(st->clkin);
+ clkin = devm_clk_get_enabled(&spi->dev, "clkin");
+ if (IS_ERR(clkin)) {
+ clkin = devm_clk_get_enabled(&spi->dev, "clkin-diff");
+ if (IS_ERR(clkin))
+ return dev_err_probe(&spi->dev, PTR_ERR(clkin),
+ "Failed to get clkin/clkin-diff\n");
+ st->ref_diff_en = true;
+ }
+
+ st->clkin_freq = clk_get_rate(clkin);
ret = adf4371_setup(st);
- if (ret < 0) {
- dev_err(&spi->dev, "ADF4371 setup failed\n");
- return ret;
- }
+ if (ret < 0)
+ return dev_err_probe(&spi->dev, ret, "ADF4371 setup failed\n");
return devm_iio_device_register(&spi->dev, indio_dev);
}
static const struct spi_device_id adf4371_id_table[] = {
- { "adf4371", ADF4371 },
- { "adf4372", ADF4372 },
- {}
+ { "adf4371", (kernel_ulong_t)&adf4371_chip_info },
+ { "adf4372", (kernel_ulong_t)&adf4372_chip_info },
+ { }
};
MODULE_DEVICE_TABLE(spi, adf4371_id_table);
static const struct of_device_id adf4371_of_match[] = {
- { .compatible = "adi,adf4371" },
- { .compatible = "adi,adf4372" },
- { },
+ { .compatible = "adi,adf4371", .data = &adf4371_chip_info },
+ { .compatible = "adi,adf4372", .data = &adf4372_chip_info},
+ { }
};
MODULE_DEVICE_TABLE(of, adf4371_of_match);
generated by cgit (git 2.34.1) at 2025-07-25 20:07:16 +0000