linux-kernel - [PATCH v3 3/6] iio: frequency: adf41513: handle LE synchronization feature

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Message-Id: <20260108-adf41513-iio-driver-v3-3-23d1371aef48@analog.com>
Date: Thu, 08 Jan 2026 12:14:52 +0000
From: Rodrigo Alencar via B4 Relay <devnull+rodrigo.alencar.analog.com@...nel.org>
To: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, Andy Shevchenko <andy@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Rodrigo Alencar <rodrigo.alencar@...log.com>
Subject: [PATCH v3 3/6] iio: frequency: adf41513: handle LE synchronization
 feature

From: Rodrigo Alencar <rodrigo.alencar@...log.com>

When LE sync is enabled, it is must be set after powering up and must be
disabled when powering down. It is recommended when using the PLL as
a frequency synthesizer, where reference signal will always be present
while the device is being configured.

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@...log.com>
---
 drivers/iio/frequency/adf41513.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/frequency/adf41513.c b/drivers/iio/frequency/adf41513.c
index 69dcbbc1f393..0cdf24989c93 100644
--- a/drivers/iio/frequency/adf41513.c
+++ b/drivers/iio/frequency/adf41513.c
@@ -220,6 +220,7 @@ struct adf41513_data {
 	bool phase_detector_polarity;
 
 	bool logic_lvl_1v8_en;
+	bool le_sync_en;
 };
 
 struct adf41513_pll_settings {
@@ -697,13 +698,25 @@ static int adf41513_set_frequency(struct adf41513_state *st, u64 freq_uhz, u16 s
 static int adf41513_suspend(struct adf41513_state *st)
 {
 	st->regs[ADF41513_REG6] |= FIELD_PREP(ADF41513_REG6_POWER_DOWN_MSK, 1);
+	st->regs[ADF41513_REG12] &= ~ADF41513_REG12_LE_SELECT_MSK;
 	return adf41513_sync_config(st, ADF41513_SYNC_DIFF);
 }
 
 static int adf41513_resume(struct adf41513_state *st)
 {
+	int ret;
+
 	st->regs[ADF41513_REG6] &= ~ADF41513_REG6_POWER_DOWN_MSK;
-	return adf41513_sync_config(st, ADF41513_SYNC_DIFF);
+	ret = adf41513_sync_config(st, ADF41513_SYNC_DIFF);
+	if (ret < 0)
+		return ret;
+
+	if (st->data.le_sync_en) {
+		st->regs[ADF41513_REG12] |= ADF41513_REG12_LE_SELECT_MSK;
+		ret = adf41513_sync_config(st, ADF41513_SYNC_DIFF);
+	}
+
+	return ret;
 }
 
 static ssize_t adf41513_read_uhz(struct iio_dev *indio_dev,
@@ -994,6 +1007,8 @@ static int adf41513_parse_fw(struct adf41513_state *st)
 		st->data.lock_detect_count = tmp;
 	}
 
+	/* load enable sync */
+	st->data.le_sync_en = device_property_read_bool(dev, "adi,le-sync-enable");
 	st->data.freq_resolution_uhz = MICROHZ_PER_HZ;
 
 	return 0;
@@ -1001,6 +1016,7 @@ static int adf41513_parse_fw(struct adf41513_state *st)
 
 static int adf41513_setup(struct adf41513_state *st)
 {
+	int ret;
 	u32 tmp;
 
 	memset(st->regs_hw, 0xFF, sizeof(st->regs_hw));
@@ -1034,8 +1050,18 @@ static int adf41513_setup(struct adf41513_state *st)
 					      st->data.logic_lvl_1v8_en ? 0 : 1);
 
 	/* perform initialization sequence with power-up frequency */
-	return adf41513_set_frequency(st, st->data.power_up_frequency_hz * MICROHZ_PER_HZ,
-				      ADF41513_SYNC_ALL);
+	ret = adf41513_set_frequency(st,
+				     st->data.power_up_frequency_hz * MICROHZ_PER_HZ,
+				     ADF41513_SYNC_ALL);
+	if (ret < 0)
+		return ret;
+
+	if (st->data.le_sync_en) {
+		st->regs[ADF41513_REG12] |= ADF41513_REG12_LE_SELECT_MSK;
+		ret = adf41513_sync_config(st, ADF41513_SYNC_DIFF);
+	}
+
+	return ret;
 }
 
 static void adf41513_power_down(void *data)

-- 
2.43.0