linux-kernel - [PATCH] iio: frequency: Use SLEEP bit instead of RESET to disable output

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Message-ID: <20250417135434.568007-1-gshahrouzi@gmail.com>
Date: Thu, 17 Apr 2025 09:54:34 -0400
From: Gabriel Shahrouzi <gshahrouzi@...il.com>
To: gregkh@...uxfoundation.org,
	jic23@...nel.org,
	lars@...afoo.de,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	Michael.Hennerich@...log.com
Cc: gshahrouzi@...il.com,
	skhan@...uxfoundation.org,
	linux-kernel-mentees@...ts.linux.dev,
	stable@...r.kernel.org
Subject: [PATCH] iio: frequency: Use SLEEP bit instead of RESET to disable output

According to the AD9832 datasheet (Table 10, D12 description), setting
the RESET bit forces the phase accumulator to zero, which corresponds to
a full-scale DC output, rather than disabling the output signal.

The correct way to disable the output and enter a low-power state is to
set the AD9832_SLEEP bit (Table 10, D13 description), which powers down
the internal DAC current sources and disables internal clocks.

Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver")
Cc: stable@...r.kernel.org
Signed-off-by: Gabriel Shahrouzi <gshahrouzi@...il.com>
---
 drivers/staging/iio/frequency/ad9832.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index db42810c7664b..0872ff4ec4896 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -232,7 +232,7 @@ static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr,
 			st->ctrl_src &= ~(AD9832_RESET | AD9832_SLEEP |
 					AD9832_CLR);
 		else
-			st->ctrl_src |= AD9832_RESET;
+			st->ctrl_src |= AD9832_SLEEP;
 
 		st->data = cpu_to_be16((AD9832_CMD_SLEEPRESCLR << CMD_SHIFT) |
 					st->ctrl_src);
-- 
2.43.0