diff options
| author | Antoniu Miclaus <antoniu.miclaus@analog.com> | 2025-01-27 13:10:23 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2025-02-08 18:16:29 +0300 |
| commit | 80ce1f106a77186bc25c5c589957bb67c381e02e (patch) | |
| tree | e229245c5712c849bef24496eca9477063f832e7 | |
| parent | e01670e31d04b743b30472bc9ec1dfd7b26af480 (diff) | |
| download | linux-80ce1f106a77186bc25c5c589957bb67c381e02e.tar.xz | |
iio: frequency: adf4371: add ref doubler
Add support for the reference doubler.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250127101026.5320-4-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
| -rw-r--r-- | drivers/iio/frequency/adf4371.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/iio/frequency/adf4371.c b/drivers/iio/frequency/adf4371.c index 41155af3c4f6..9a84e81787b1 100644 --- a/drivers/iio/frequency/adf4371.c +++ b/drivers/iio/frequency/adf4371.c @@ -45,6 +45,8 @@ /* 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) @@ -76,6 +78,9 @@ #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 /* MOD2 is the programmable, 14-bit auxiliary fractional modulus */ @@ -483,7 +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 */ @@ -516,8 +521,14 @@ static int adf4371_setup(struct adf4371_state *st) (!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; @@ -531,7 +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 */ |