Lines Matching +full:spi +full:- +full:gpio
1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/spi/spi-controller.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: SPI Controller Generic Binding
10 - Mark Brown <broonie@kernel.org>
13 SPI busses can be described with a node for the SPI controller device
14 and a set of child nodes for each SPI slave on the bus. The system SPI
15 controller may be described for use in SPI master mode or in SPI slave mode,
20 pattern: "^spi(@.*|-[0-9a-f])*$"
22 "#address-cells":
25 "#size-cells":
28 cs-gpios:
32 increased automatically with max(cs-gpios, hardware chip selects).
35 cs-gpios looks like this
36 cs-gpios = <&gpio1 0 0>, <0>, <&gpio1 1 0>, <&gpio1 2 0>;
45 The second flag of a gpio descriptor can be GPIO_ACTIVE_HIGH (0)
49 cs-gpio with the optional spi-cs-high flag for SPI slaves.
52 driven (not considering potential gpio inversions by pinmux):
54 device node | cs-gpio | CS pin state active | Note
56 spi-cs-high | - | H |
57 - | - | L |
58 spi-cs-high | ACTIVE_HIGH | H |
59 - | ACTIVE_HIGH | L | 1
60 spi-cs-high | ACTIVE_LOW | H | 2
61 - | ACTIVE_LOW | L |
65 Here it would be wise to avoid and define the gpio as
68 because ACTIVE_LOW is overridden by spi-cs-high.
70 spi-cs-high + ACTIVE_HIGH.
72 num-cs:
77 spi-slave:
80 The SPI controller acts as a slave, instead of a master.
88 Compatible of the SPI device.
91 - compatible
94 "^.*@[0-9a-f]+$":
100 Compatible of the SPI device.
111 spi-3wire:
114 The device requires 3-wire mode.
116 spi-cpha:
121 spi-cpol:
126 spi-cs-high:
131 spi-lsb-first:
136 spi-max-frequency:
139 Maximum SPI clocking speed of the device in Hz.
141 spi-rx-bus-width:
143 Bus width to the SPI bus used for read transfers.
149 spi-rx-delay-us:
153 spi-tx-bus-width:
155 Bus width to the SPI bus used for write transfers.
161 spi-tx-delay-us:
166 - compatible
167 - reg
170 - if:
173 - spi-slave
176 "#address-cells":
180 "#address-cells":
186 - |
187 spi@80010000 {
188 #address-cells = <1>;
189 #size-cells = <0>;
190 compatible = "fsl,imx28-spi";
194 dma-names = "rx-tx";
198 spi-max-frequency = <1000000>;
204 spi-max-frequency = <100000>;