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iio: frequency: adf4371: Add support for output stage mute

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Another feature of the ADF4371/ADF4372 is that the supply current to the
RF8P and RF8N output stage can shut down until the ADF4371 achieves lock
as measured by the digital lock detect circuitry. The mute to lock
detect bit (MUTE_LD) in REG25 enables this function.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stefan Popa 2019-06-24 18:13:56 +03:00 committed by Jonathan Cameron
parent 84ed6482c6
commit def914a4c3
2 changed files with 20 additions and 0 deletions
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7
Documentation/devicetree/bindings/iio/frequency/adf4371.yaml
View File

@ -33,6 +33,13 @@ properties:
Must be "clkin"
maxItems: 1
adi,mute-till-lock-en:
type: boolean
description:
If this property is present, then the supply current to RF8P and RF8N
output stage will shut down until the ADF4371/ADF4372 achieves lock as
measured by the digital lock detect circuitry.
required:
- compatible
- reg

13
drivers/iio/frequency/adf4371.c
View File

@ -45,6 +45,10 @@
#define ADF4371_RF_DIV_SEL_MSK GENMASK(6, 4)
#define ADF4371_RF_DIV_SEL(x) FIELD_PREP(ADF4371_RF_DIV_SEL_MSK, x)
/* ADF4371_REG25 */
#define ADF4371_MUTE_LD_MSK BIT(7)
#define ADF4371_MUTE_LD(x) FIELD_PREP(ADF4371_MUTE_LD_MSK, x)
/* ADF4371_REG32 */
#define ADF4371_TIMEOUT_MSK GENMASK(1, 0)
#define ADF4371_TIMEOUT(x) FIELD_PREP(ADF4371_TIMEOUT_MSK, x)
@ -484,6 +488,15 @@ static int adf4371_setup(struct adf4371_state *st)
if (ret < 0)
return ret;
/* Mute to Lock Detect */
if (device_property_read_bool(&st->spi->dev, "adi,mute-till-lock-en")) {
ret = regmap_update_bits(st->regmap, ADF4371_REG(0x25),
ADF4371_MUTE_LD_MSK,
ADF4371_MUTE_LD(1));
if (ret < 0)
return ret;
}
/* Set address in ascending order, so the bulk_write() will work */
ret = regmap_update_bits(st->regmap, ADF4371_REG(0x0),
ADF4371_ADDR_ASC_MSK | ADF4371_ADDR_ASC_R_MSK,