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[80.116.51.172]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ac71961f9cfsm652288566b.122.2025.03.31.12.04.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Mar 2025 12:04:03 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Mon, 31 Mar 2025 21:02:45 +0200 Subject: [PATCH v2 2/5] docs: iio: add documentation for ad3552r driver Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250331-wip-bl-ad3552r-fixes-v2-2-cdedb430497e@baylibre.com> References: <20250331-wip-bl-ad3552r-fixes-v2-0-cdedb430497e@baylibre.com> In-Reply-To: <20250331-wip-bl-ad3552r-fixes-v2-0-cdedb430497e@baylibre.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Jonathan Cameron , Lars-Peter Clausen , Jonathan Corbet , Olivier Moysan , Michael Hennerich Cc: linux-iio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Angelo Dureghello X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4191; i=adureghello@baylibre.com; h=from:subject:message-id; bh=K6IzTR+F1J2B1DTGHtf/OPY+ArUlb20kadSjMscdtUE=; b=owGbwMvMwCXGf3bn1e/btlsznlZLYkh/9exWaIWaQl1Sgvvim+/ND1wUOxlvZZSyOOmFicU1t SQzA8nijlIWBjEuBlkxRZa6xAiT0NuhUsoLGGfDzGFlAhnCwMUpABNxOMnIcOvf041rRYquJ2Va 2QpoPv3Ata/+n+W65Y7zdy7bEVgeWMbwT0+06WiWnH9pVMvMLcsmGfuk2S3fryiV9rR/jmePNr8 UDwA= X-Developer-Key: i=adureghello@baylibre.com; a=openpgp; fpr=703CDFAD8B573EB00850E38366D1CB9419AF3953 From: Angelo Dureghello Add documentation for ad3552r driver, needed to describe the high-speed driver debugfs attributes and shows how the user may use them. Signed-off-by: Angelo Dureghello --- Documentation/iio/ad3552r.rst | 72 +++++++++++++++++++++++++++++++++++++++++++ Documentation/iio/index.rst | 1 + MAINTAINERS | 1 + 3 files changed, 74 insertions(+) diff --git a/Documentation/iio/ad3552r.rst b/Documentation/iio/ad3552r.rst new file mode 100644 index 0000000000000000000000000000000000000000..2af24cfe886f1f4c1b86ac679fd19b83635b6771 --- /dev/null +++ b/Documentation/iio/ad3552r.rst @@ -0,0 +1,72 @@ +.. SPDX-License-Identifier: GPL-2.0-only + +============== +AD3552R driver +============== + +Device driver for Analog Devices Inc. AD35XXR series of DACs. The module name +is ``ad3552r``. +With the same module name, two different driver variants are available, the +``generic spi`` variant, to be used with any classic SPI controllers, and the +``hs`` (high speed) variant, for an ADI ``axi-dac`` (IP core) based controller +that allows to reach the maximum sample rate supported from the DACs, using the +DMA transfer and all the SPI lines available (D/QDSPI).. +The high speed driver variant is intended to be used with the ``adi-axi-dac`` +backend support enabled, that is enabled by default when the driver is selected. + +Supported devices +================= + +* `AD3541R `_ +* `AD3542R `_ +* `AD3551R `_ +* `AD3552R `_ + +Wiring connections +================== + +Generic SPI +----------- +Use the classic SPI S_CLK/CS/SDO/SDI connection. + +High speed (using axi-dac backend) +---------------------------------- + +:: + + .-----------------. .-------. + | |--- D/QSPI -----| | + | DAC IP CORE |--- SPI S_CLK --| DAC | + | |--- SPI CS -----| | + | |--- LDAC -------| | + | |--- RESET ------| | + |_________________| |_______| + + +High speed features +=================== + +Device attributes +----------------- + +The following table shows the ad35xxr related device debug files, found in the +specific device debug folder path ``/sys/kernel/debug/iio/iio:deviceX``. + ++----------------------+-------------------------------------------------------+ +| Debugfs device files | Description | ++----------------------+-------------------------------------------------------+ +| data_source | The used data source, | +| | as ``iio-buffer`` or ``backend-ramp-generator``. | ++----------------------+-------------------------------------------------------+ + +Usage examples +-------------- + +. code-block:: bash + root:/sys/bus/iio/devices/iio:device0# cat data_source + iio-buffer + root:/sys/bus/iio/devices/iio:device0# echo -n backend-ramp-generator > data_source + root:/sys/bus/iio/devices/iio:device0# cat data_source + backend-ramp-generator + + diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst index bbb2edce8272e7483acca500d1a757bbcc11c1e0..2d6afc5a8ed54a90cd8d5723f0dc5212b8593d16 100644 --- a/Documentation/iio/index.rst +++ b/Documentation/iio/index.rst @@ -19,6 +19,7 @@ Industrial I/O Kernel Drivers .. toctree:: :maxdepth: 1 + ad3552r ad4000 ad4030 ad4695 diff --git a/MAINTAINERS b/MAINTAINERS index 57eaab00f6cb53df52a4799eb2c1afbbd1e77a1e..52bc56a9ee22c66b90555681c4757ea4399adae1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1295,6 +1295,7 @@ L: linux-iio@vger.kernel.org S: Supported W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml +F: Documentation/iio/ad3552r.rst F: drivers/iio/dac/ad3552r.c ANALOG DEVICES INC AD4000 DRIVER