adi,adgm3121 (on spi bus)

Overview

Name:

adi,adgm3121

Vendor:

Analog Devices, Inc.

Used in:

List of boards using this compatible

Driver:

drivers/mux/mux_adi_adgm3121.c

Description

Analog Devices ADGM3121 DPDT MEMS switch (DC-24GHz), SPI control mode,
exposed as a MUX controller.

The four MEMS switches (SW1..SW4) are modeled as a single control line
whose state is a 4-bit switch bitmask: bit i selects SW(i+1), 1 = closed.
mux_control_disconnect() opens all four switches (mask = 0).

Examples

&spi1 {
        adgm3121: adgm3121@0 {
                compatible = "adi,adgm3121";
                reg = <0>;
                spi-max-frequency = <10000000>;
                #mux-control-cells = <0>;
                #mux-state-cells = <1>;
        };
};

consumer {
        mux-controls = <&adgm3121>;        /* runtime switch mask */
        mux-states   = <&adgm3121 0x5>;    /* static: SW1 + SW3 closed */
};

Properties

Node specific propertiesDeprecated node specific propertiesBase properties

Properties not inherited from the base binding file.

Name	Type	Details
#mux-control-cells	int	Number of cells in a "mux-controls" specifier. These cells form the addressing portion only (which output line) and do NOT include the target state value. Drivers receive the addressing cells in the "cells" field of struct mux_control. This property is required. Constant value: 0
#mux-state-cells	int	Number of cells in a "mux-states" specifier. Equals #mux-control-cells + 1: the trailing cell carries the default state value. Backends may name the trailing cell whatever best describes the hardware (e.g. "state" for a generic mux, "input" for an XBAR, "source" for a TRGMUX). This property is required. Constant value: 1
spi-max-frequency	int	Maximum clock frequency of device's SPI interface in Hz This property is required.
duplex	int	Duplex mode, full or half. By default it's always full duplex thus 0 as this is, by far, the most common mode. Use the macros not the actual enum value, here is the concordance list (see dt-bindings/spi/spi.h) 0 SPI_FULL_DUPLEX 2048 SPI_HALF_DUPLEX Default value: 0 Legal values: 0, 2048
frame-format	int	Motorola or TI frame format. By default it's always Motorola's, thus 0 as this is, by far, the most common format. Use the macros not the actual enum value, here is the concordance list (see dt-bindings/spi/spi.h) 0 SPI_FRAME_FORMAT_MOTOROLA 32768 SPI_FRAME_FORMAT_TI Default value: 0 Legal values: 0, 32768
spi-cpol	boolean	SPI clock polarity which indicates the clock idle state. If it is used, the clock idle state is logic high; otherwise, low.
spi-cpha	boolean	SPI clock phase that indicates on which edge data is sampled. If it is used, data is sampled on the second edge; otherwise, on the first edge.
spi-lsb-first	boolean	The device requires least significant bit first data mode.
spi-hold-cs	boolean	In some cases, it is necessary for the master to manage SPI chip select under software control, so that multiple spi transactions can be performed without releasing it. A typical use case is variable length SPI packets where the first spi transaction reads the length and the second spi transaction reads length bytes.
spi-cs-high	boolean	The device requires the chip select to be active high.
spi-interframe-delay-ns	int	Delay in nanoseconds between SPI words. Default of 0 is special value which will assume to mean half of the SCK period. Default value: 0
spi-cs-setup-delay-ns	int	Delay in nanoseconds to be introduced by the controller after CS is asserted. Also known as enable lead time.
spi-cs-hold-delay-ns	int	Delay in nanoseconds to be introduced by the controller before the CS is de-asserted. Also known as enable lag time.
supply-gpios	phandle-array	GPIO specifier that controls power to the device. This property should be provided when the device has a dedicated switch that controls power to the device. The supply state is entirely the responsibility of the device driver. Contrast with vin-supply.
vin-supply	phandle	Reference to the regulator that controls power to the device. The referenced devicetree node must have a regulator compatible. This property should be provided when device power is supplied by a shared regulator. The supply state is dependent on the request status of all devices fed by the regulator. Contrast with supply-gpios. If both properties are provided then the regulator must be requested before the supply GPIOS is set to an active state, and the supply GPIOS must be set to an inactive state before releasing the regulator.

Specifier cell names

• mux-state cells: switches