On Thu, 2025-01-09 at 15:37 +0200, Antoniu Miclaus wrote:
> Add support for the reference doubler.
>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
> ---
LGTM:
Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
> no changes in v4.
> drivers/iio/frequency/adf4371.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/frequency/adf4371.c b/drivers/iio/frequency/adf4371.c
> index 50450e7b5464..a57fc24a6799 100644
> --- a/drivers/iio/frequency/adf4371.c
> +++ b/drivers/iio/frequency/adf4371.c
> @@ -44,6 +44,8 @@
> /* 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)
> @@ -75,6 +77,9 @@
> #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 */
> @@ -481,7 +486,7 @@ 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 */
> @@ -514,8 +519,14 @@ 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;
> @@ -529,7 +540,8 @@ 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 */
