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linux/drivers/iio/frequency
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Michael Hennerich ce3922c614 iio: frequency: adf4350: Fix prescaler usage. 
commit 33d7ecbf69 upstream.

The ADF4350/1 features a programmable dual-modulus prescaler of 4/5 or 8/9.
When set to 4/5, the maximum RF frequency allowed is 3 GHz.
Therefore, when operating the ADF4351 above 3 GHz, this must be set to 8/9.
In this context not the RF output frequency is meant
- it's the VCO frequency.

Therefore move the prescaler selection after we derived the VCO frequency
from the desired RF output frequency.

This BUG may have caused PLL lock instabilities when operating the VCO at
the very high range close to 4.4 GHz.

Fixes: e31166f0fd ("iio: frequency: New driver for Analog Devices ADF4350/ADF4351 Wideband Synthesizers")
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20250829-adf4350-fix-v2-1-0bf543ba797d@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-10-19 16:37:26 +02:00
..
ad9523.c iio: normalize array sentinel style 2025-04-22 19:10:04 +01:00
adf4350.c iio: frequency: adf4350: Fix prescaler usage. 2025-10-19 16:37:26 +02:00
adf4371.c iio: normalize array sentinel style 2025-04-22 19:10:04 +01:00
adf4377.c iio: normalize array sentinel style 2025-04-22 19:10:04 +01:00
admfm2000.c iio: frequency: admfm2000: Use device_for_each_child_node_scoped() to simplify error paths. 2024-04-06 11:29:06 +01:00
admv1013.c iio: admv1013: replace redundant ternary operator with just len 2025-05-21 14:21:34 +01:00
admv1014.c iio: normalize array sentinel style 2025-04-22 19:10:04 +01:00
admv4420.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
adrf6780.c iio: normalize array sentinel style 2025-04-22 19:10:04 +01:00
Kconfig iio: frequency: admv4420: fix missing select REMAP_SPI in Kconfig 2024-10-10 19:27:25 +01:00
Makefile iio: frequency: admfm2000: New driver 2024-02-17 16:16:10 +00:00