linux-kernel - [PATCH 5/5] staging: iio: ad9832: add sysfs documentation

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Message-ID: <20251215190806.11003-6-tomasborquez13@gmail.com>
Date: Mon, 15 Dec 2025 16:08:06 -0300
From: Tomas Borquez <tomasborquez13@...il.com>
To: Jonathan Cameron <jic23@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>
Cc: David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	Tomas Borquez <tomasborquez13@...il.com>
Subject: [PATCH 5/5] staging: iio: ad9832: add sysfs documentation

Add sysfs ABI documentation for the AD9832/AD9835 Direct Digital
Synthesizer chips, documenting frequency, phase, output control,
and pin control attributes.

Signed-off-by: Tomas Borquez <tomasborquez13@...il.com>
---
 .../Documentation/sysfs-bus-iio-dds-ad9832    | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832

diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832 b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832
new file mode 100644
index 0000000000..5ceea57917
--- /dev/null
+++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds-ad9832
@@ -0,0 +1,41 @@
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrent0_frequencyY
+KernelVersion:	6.19
+Contact:	linux-iio@...r.kernel.org
+Description:
+    Frequency in Hz for frequency register Y (0-1). The active
+    frequency register is selected via out_altcurrent0_frequency_symbol.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrent0_phaseY
+KernelVersion:	6.19
+Contact:	linux-iio@...r.kernel.org
+Description:
+    Phase offset in radians for phase register Y (0-3). Valid
+    range is 0 to 2*PI (exclusive) with 12-bit hardware resolution. The
+    active phase register is selected via out_altcurrent0_phase_symbol.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrent0_frequency_symbol
+KernelVersion:	6.19
+Contact:	linux-iio@...r.kernel.org
+Description:
+    Selects which frequency register (0 or 1) is active for output.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrent0_phase_symbol
+KernelVersion:	6.19
+Contact:	linux-iio@...r.kernel.org
+Description:
+    Selects which phase register (0-3) is active for output.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrent0_enable
+KernelVersion:	6.19
+Contact:	linux-iio@...r.kernel.org
+Description:
+    Enables (1) or disables (0) the output. When disabled, the
+    device is held in reset state.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrent0_pincontrol_en
+KernelVersion:	6.19
+Contact:	linux-iio@...r.kernel.org
+Description:
+    Enables (1) or disables (0) hardware pin control for frequency
+    and phase selection. When enabled, external pins control
+    register selection instead of software.
-- 
2.43.0