From: Antoniu Miclaus <antoniu.miclaus@analog.com>
To: <jic23@kernel.org>, <robh@kernel.org>, <conor+dt@kernel.org>,
<linux-iio@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-pwm@vger.kernel.org>
Cc: Antoniu Miclaus <antoniu.miclaus@analog.com>,
Nuno Sa <nuno.sa@analog.com>
Subject: [PATCH v5 3/3] iio: frequency: adf4371: add ref doubler
Date: Mon, 20 Jan 2025 13:34:04 +0200 [thread overview]
Message-ID: <20250120113408.24395-4-antoniu.miclaus@analog.com> (raw)
In-Reply-To: <20250120113408.24395-1-antoniu.miclaus@analog.com>
Add support for the reference doubler.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
no changes in v5.
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 */
--
2.48.1
next prev parent reply other threads:[~2025-01-20 11:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-20 11:34 [PATCH v5 0/3] ADF4371 refin mode and doubler support Antoniu Miclaus
2025-01-20 11:34 ` [PATCH v5 1/3] dt-bindings: iio: adf4371: add refin mode Antoniu Miclaus
2025-01-21 17:35 ` Conor Dooley
2025-01-20 11:34 ` [PATCH v5 2/3] iio: frequency: " Antoniu Miclaus
2025-01-20 11:34 ` Antoniu Miclaus [this message]
2025-01-25 12:39 ` [PATCH v5 0/3] ADF4371 refin mode and doubler support Jonathan Cameron
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