Lines Matching +full:spi +full:- +full:mode
1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Michael Hennerich <Michael.Hennerich@analog.com>
11 - Nuno Sá <nuno.sa@analog.com>
14 A family of pin-compatible single channel differential analog to digital
15 converters with SPI support in a LFCSP package.
21 $ref: /schemas/spi/spi-peripheral-props.yaml#
26 - adi,ad7944
27 - adi,ad7985
28 - adi,ad7986
33 spi-max-frequency:
36 spi-cpol: true
37 spi-cpha: true
39 adi,spi-mode:
43 This property indicates the SPI wiring configuration.
46 the datasheet calls "4-wire mode". This is the conventional SPI mode used
47 when there are multiple devices on the same bus. In this mode, the CNV
49 CS on the SPI controller.
54 * single: The datasheet calls this "3-wire mode". (NOTE: The datasheet's
55 definition of 3-wire mode is NOT at all related to the standard
56 spi-3wire property!) This mode is often used when the ADC is the only
57 device on the bus. In this mode, SDI is tied to VIO, and the CNV line
58 can be connected to the CS line of the SPI controller or to a GPIO, in
60 * chain: The datasheet calls this "chain mode". This mode is used to save
61 on wiring when multiple ADCs are used. In this mode, the SDI line of
64 chain is connected to the SPI bus. The CNV line of all chips are tied
65 together. The CS line of the SPI controller can be used as the CNV line
68 '#daisy-chained-devices': true
70 avdd-supply:
73 dvdd-supply:
76 vio-supply:
80 bvdd-supply:
84 connected to the same supply as ref-supply. Otherwise, when using an
88 ref-supply:
93 refin-supply:
100 cnv-gpios:
103 the conversions and selects the SPI mode of the device (chain or CS). In
104 'single' mode, this property is omitted if the CNV pin is connected to the
105 CS line of the SPI controller.
108 turbo-gpios:
111 line is hard-wired and the state is determined by the adi,always-turbo
115 adi,always-turbo:
118 When present, this property indicates that the TURBO line is hard-wired
119 and the state is always high. If neither this property nor turbo-gpios is
120 present, the TURBO line is assumed to be hard-wired and the state is
127 while the SDI line is high and the CNV line is low ('single' mode) or the
128 SDI line is low and the CNV line is high ('multi' mode); or when the SDO
129 line goes high while the SDI and CNV lines are high (chain mode),
133 - compatible
134 - reg
135 - avdd-supply
136 - dvdd-supply
137 - vio-supply
138 - bvdd-supply
141 # ref-supply and refin-supply are mutually exclusive (neither is also valid)
142 - if:
144 - ref-supply
147 refin-supply: false
148 - if:
150 - refin-supply
153 ref-supply: false
154 # in '4-wire' mode, cnv-gpios is required, for other modes it is optional
155 - if:
158 - adi,spi-mode
161 - cnv-gpios
162 # chain mode has lower SCLK max rate and doesn't work when TURBO is enabled
163 - if:
165 - adi,spi-mode
167 adi,spi-mode:
171 spi-max-frequency:
173 adi,always-turbo: false
175 - '#daisy-chained-devices'
178 '#daisy-chained-devices': false
179 # turbo-gpios and adi,always-turbo are mutually exclusive
180 - if:
182 - turbo-gpios
185 adi,always-turbo: false
186 - if:
188 - adi,always-turbo
191 turbo-gpios: false
196 - |
197 #include <dt-bindings/gpio/gpio.h>
198 spi {
199 #address-cells = <1>;
200 #size-cells = <0>;
204 spi-cpha;
205 spi-max-frequency = <111111111>;
206 avdd-supply = <&supply_2_5V>;
207 dvdd-supply = <&supply_2_5V>;
208 vio-supply = <&supply_1_8V>;
209 bvdd-supply = <&supply_5V>;
210 cnv-gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
211 turbo-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;