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Thu, 28 Jun 2018 08:15:07 -0400 From: Stefan Popa To: , , CC: , , , , , , , , , , , , , Subject: [PATCH v3 2/2] dt-bindings: iio: dac: Add docs for AD5758 DAC Date: Thu, 28 Jun 2018 15:14:33 +0300 Message-ID: <1530188073-28362-1-git-send-email-stefan.popa@analog.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-ADIRoutedOnPrem: True X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:137.71.25.55; IPV:NLI; CTRY:US; EFV:NLI; SFV:NSPM; SFS:(10009020)(396003)(346002)(376002)(136003)(39860400002)(2980300002)(438002)(189003)(199004)(14444005)(2906002)(336012)(426003)(2870700001)(966005)(5820100001)(4326008)(7696005)(50466002)(5660300001)(23676004)(2616005)(476003)(486006)(6306002)(107886003)(2201001)(126002)(44832011)(6666003)(7416002)(246002)(356003)(106466001)(47776003)(305945005)(106002)(53416004)(72206003)(316002)(478600001)(54906003)(50226002)(8936002)(7636002)(186003)(77096007)(26005)(8676002)(1720100001)(6346003)(36756003)(110136005); 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Ip=[137.71.25.55]; Helo=[nwd2mta1.analog.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR03MB556 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Stefan Popa --- Changes in v3: - AD5758 can be both a current and voltage output DAC. The decision is made based on the DT and the channel type is set during probe. - range was replaced by range-microvolt and range-microamp - dc-dc-mode, range-microvolt and range-microamp are required properties. - Introduced a slew-time-us property from which slew rate clock and slew rate step are calculated using a best match algorithm. - Added units in the name of the properties. - Offered more explanation for the various modes of operation. Changes in v2: - Nothing changed, just to follow the patch set version. .../devicetree/bindings/iio/dac/ad5758.txt | 73 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 74 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/ad5758.txt diff --git a/Documentation/devicetree/bindings/iio/dac/ad5758.txt b/Documentation/devicetree/bindings/iio/dac/ad5758.txt new file mode 100644 index 0000000..797df9b --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/ad5758.txt @@ -0,0 +1,73 @@ +Analog Devices AD5758 DAC device driver + +Required properties for the AD5758: + - compatible: Must be "adi,ad5758" + - reg: SPI chip select number for the device + - spi-max-frequency: Max SPI frequency to use (< 50000000) + - spi-cpha: is the only mode that is supported + +Required properties: + + - adi,dc-dc-mode: Mode of operation of the dc-to-dc converter + Dynamic Power Control (DPC) + In this mode, the AD5758 circuitry senses the output voltage and + dynamically regulates the supply voltage, VDPC+, to meet compliance + requirements plus an optimized headroom voltage for the output buffer. + + Programmable Power Control (PPC) + In this mode, the VDPC+ voltage is user-programmable to a fixed level + that needs to accommodate the maximum output load required. + + The output of the DAC core is either converted to a current or voltage + output at the VIOUT pin. Only one mode can be enabled at any one time. + + The following values are currently supported: + * 1: DPC current mode + * 2: DPC voltage mode + * 3: PPC current mode + + Depending on the selected output mode (voltage or current) one of the two properties must + be present: + + - adi,range-microvolt: Voltage output range + The array of voltage output ranges must contain two fields: + * <0 5000000>: 0 V to 5 V voltage range + * <0 10000000>: 0 V to 10 V voltage range + * <(-5000000) 5000000>: ±5 V voltage range + * <(-10000000) 10000000>: ±10 V voltage range + - adi,range-microamp: Current output range + The array of current output ranges must contain two fields: + * <0 20000>: 0 mA to 20 mA current range + * <0 24000>: 0 mA to 24 mA current range + * <4 24000>: 4 mA to 20 mA current range + * <(-20000) 20000>: ±20 mA current range + * <(-24000) 24000>: ±24 mA current range + * <(-1000) 22000>: −1 mA to +22 mA current range + +Optional properties: + + - adi,dc-dc-ilim-microamp: The dc-to-dc converter current limit + The following values are currently supported [uA]: + * 150000 + * 200000 + * 250000 + * 300000 + * 350000 + * 400000 + + - adi,slew-time-us: The time it takes for the output to reach the full scale [uS] + The supported range is between 133us up to 1023984375us + +AD5758 Example: + + ad5758@0 { + compatible = "adi,ad5758"; + reg = <0>; + spi-max-frequency = <1000000>; + spi-cpha; + + adi,dc-dc-mode = <2>; + adi,range-microvolt = <0 10000000>; + adi,dc-dc-ilim-microamp = <200000>; + adi,slew-time-us = <125000>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 12d102d..60b1028 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -802,6 +802,7 @@ L: linux-iio@vger.kernel.org W: http://ez.analog.com/community/linux-device-drivers S: Supported F: drivers/iio/dac/ad5758.c +F: Documentation/devicetree/bindings/iio/dac/ad5758.txt ANALOG DEVICES INC AD5686 DRIVER M: Stefan Popa