Commit 80ce1f10 authored by Antoniu Miclaus's avatar Antoniu Miclaus Committed by Jonathan Cameron
Browse files

iio: frequency: adf4371: add ref doubler 



Add support for the reference doubler.

Reviewed-by: default avatarNuno Sa <nuno.sa@analog.com>
Signed-off-by: default avatarAntoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250127101026.5320-4-antoniu.miclaus@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent e01670e3

drivers/iio/frequency/adf4371.c

+14 −2
Original line number Diff line number Diff line
@@ -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 */