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Diffstat (limited to 'Documentation/devicetree/bindings/mux')
6 files changed, 641 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mux/adi,adg792a.txt b/Documentation/devicetree/bindings/mux/adi,adg792a.txt new file mode 100644 index 000000000..b0e5bf690 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/adi,adg792a.txt @@ -0,0 +1,75 @@ +Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers + +Required properties: +- compatible : "adi,adg792a" or "adi,adg792g" +- #mux-control-cells : <0> if parallel (the three muxes are bound together + with a single mux controller controlling all three muxes), or <1> if + not (one mux controller for each mux). +* Standard mux-controller bindings as described in mux-controller.yaml + +Optional properties for ADG792G: +- gpio-controller : if present, #gpio-cells below is required. +- #gpio-cells : should be <2> + - First cell is the GPO line number, i.e. 0 or 1 + - Second cell is used to specify active high (0) + or active low (1) + +Optional properties: +- idle-state : if present, array of states that the mux controllers will have + when idle. The special state MUX_IDLE_AS_IS is the default and + MUX_IDLE_DISCONNECT is also supported. + +States 0 through 3 correspond to signals A through D in the datasheet. + +Example: + + /* + * Three independent mux controllers (of which one is used). + * Mux 0 is disconnected when idle, mux 1 idles in the previously + * selected state and mux 2 idles with signal B. + */ + &i2c0 { + mux: mux-controller@50 { + compatible = "adi,adg792a"; + reg = <0x50>; + #mux-control-cells = <1>; + + idle-state = <MUX_IDLE_DISCONNECT MUX_IDLE_AS_IS 1>; + }; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux 2>; + + channels = "sync-1", "", "out"; + }; + + + /* + * Three parallel muxes with one mux controller, useful e.g. if + * the adc is differential, thus needing two signals to be muxed + * simultaneously for correct operation. + */ + &i2c0 { + pmux: mux-controller@50 { + compatible = "adi,adg792a"; + reg = <0x50>; + #mux-control-cells = <0>; + + idle-state = <1>; + }; + }; + + diff-adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&pmux>; + + channels = "sync-1", "", "out"; + }; diff --git a/Documentation/devicetree/bindings/mux/adi,adgs1408.txt b/Documentation/devicetree/bindings/mux/adi,adgs1408.txt new file mode 100644 index 000000000..453a38961 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/adi,adgs1408.txt @@ -0,0 +1,48 @@ +Bindings for Analog Devices ADGS1408/1409 8:1/Dual 4:1 Mux + +Required properties: +- compatible : Should be one of + * "adi,adgs1408" + * "adi,adgs1409" +* Standard mux-controller bindings as described in mux-controller.yaml + +Optional properties for ADGS1408/1409: +- gpio-controller : if present, #gpio-cells is required. +- #gpio-cells : should be <2> + - First cell is the GPO line number, i.e. 0 to 3 + for ADGS1408 and 0 to 4 for ADGS1409 + - Second cell is used to specify active high (0) + or active low (1) + +Optional properties: +- idle-state : if present, the state that the mux controller will have + when idle. The special state MUX_IDLE_AS_IS is the default and + MUX_IDLE_DISCONNECT is also supported. + +States 0 through 7 correspond to signals S1 through S8 in the datasheet. +For ADGS1409 only states 0 to 3 are available. + +Example: + + /* + * One mux controller. + * Mux state set to idle as is (no idle-state declared) + */ + &spi0 { + mux: mux-controller@0 { + compatible = "adi,adgs1408"; + reg = <0>; + spi-max-frequency = <1000000>; + #mux-control-cells = <0>; + }; + } + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 1>; + io-channel-names = "parent"; + mux-controls = <&mux>; + + channels = "out_a0", "out_a1", "test0", "test1", + "out_b0", "out_b1", "testb0", "testb1"; + }; diff --git a/Documentation/devicetree/bindings/mux/gpio-mux.yaml b/Documentation/devicetree/bindings/mux/gpio-mux.yaml new file mode 100644 index 000000000..b597c1f2c --- /dev/null +++ b/Documentation/devicetree/bindings/mux/gpio-mux.yaml @@ -0,0 +1,99 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mux/gpio-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: GPIO-based multiplexer controller + +maintainers: + - Peter Rosin <peda@axentia.se> + +description: |+ + Define what GPIO pins are used to control a multiplexer. Or several + multiplexers, if the same pins control more than one multiplexer. + + The multiplexer state is defined as the number represented by the + multiplexer GPIO pins, where the first pin is the least significant + bit. An active pin is a binary 1, an inactive pin is a binary 0. + +properties: + compatible: + const: gpio-mux + + mux-gpios: + description: + List of gpios used to control the multiplexer, least significant bit first. + + '#mux-control-cells': + enum: [ 0, 1 ] + + '#mux-state-cells': + enum: [ 1, 2 ] + + idle-state: + default: -1 + +required: + - compatible + - mux-gpios +anyOf: + - required: + - "#mux-control-cells" + - required: + - "#mux-state-cells" + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + + channels = "sync-1", "in", "out", "sync-2"; + }; + + i2c-mux { + compatible = "i2c-mux"; + i2c-parent = <&i2c1>; + + mux-controls = <&mux>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + + ssd1307: oled@3c { + reg = <0x3c>; + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + pca9555: pca9555@20 { + reg = <0x20>; + }; + }; + }; +... diff --git a/Documentation/devicetree/bindings/mux/mux-consumer.yaml b/Documentation/devicetree/bindings/mux/mux-consumer.yaml new file mode 100644 index 000000000..9e2d78a78 --- /dev/null +++ b/Documentation/devicetree/bindings/mux/mux-consumer.yaml @@ -0,0 +1,67 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mux/mux-consumer.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Common multiplexer controller consumer + +maintainers: + - Peter Rosin <peda@axentia.se> + +description: | + Mux controller consumers should specify a list of mux controllers that they + want to use with a property containing a 'mux-ctrl-list': + + mux-ctrl-list ::= <single-mux-ctrl> [mux-ctrl-list] + single-mux-ctrl ::= <mux-ctrl-phandle> [mux-ctrl-specifier] + mux-ctrl-phandle : phandle to mux controller node + mux-ctrl-specifier : array of #mux-control-cells specifying the + given mux controller (controller specific) + + Mux controller properties should be named "mux-controls". The exact meaning of + each mux controller property must be documented in the device tree binding for + each consumer. An optional property "mux-control-names" may contain a list of + strings to label each of the mux controllers listed in the "mux-controls" + property. + + If it is required to provide the state that the mux controller needs to + be set to, the property "mux-states" must be used. An optional property + "mux-state-names" can be used to provide a list of strings, to label + each of the multiplixer states listed in the "mux-states" property. + + Properties "mux-controls" and "mux-states" can be used depending on how + the consumers want to control the mux controller. If the consumer needs + needs to set multiple states in a mux controller, then property + "mux-controls" can be used. If the consumer needs to set the mux + controller to a given state then property "mux-states" can be used. + + mux-ctrl-specifier typically encodes the chip-relative mux controller number. + If the mux controller chip only provides a single mux controller, the + mux-ctrl-specifier can typically be left out. + +select: true + +properties: + mux-controls: + $ref: /schemas/types.yaml#/definitions/phandle-array + + mux-states: + $ref: /schemas/types.yaml#/definitions/phandle-array + + mux-control-names: + description: + Devices that use more than a single mux controller can use the + "mux-control-names" property to map the name of the requested mux + controller to an index into the list given by the "mux-controls" property. + + mux-state-names: + description: + Devices that use more than a single multiplexer state can use the + "mux-state-names" property to map the name of the requested mux + controller to an index into the list given by the "mux-states" + property. + +additionalProperties: true + +... diff --git a/Documentation/devicetree/bindings/mux/mux-controller.yaml b/Documentation/devicetree/bindings/mux/mux-controller.yaml new file mode 100644 index 000000000..8b943082a --- /dev/null +++ b/Documentation/devicetree/bindings/mux/mux-controller.yaml @@ -0,0 +1,206 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mux/mux-controller.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Common multiplexer controller provider + +maintainers: + - Peter Rosin <peda@axentia.se> + +description: | + A multiplexer (or mux) controller will have one, or several, consumer devices + that uses the mux controller. Thus, a mux controller can possibly control + several parallel multiplexers. Presumably there will be at least one + multiplexer needed by each consumer, but a single mux controller can of course + control several multiplexers for a single consumer. + + A mux controller provides a number of states to its consumers, and the state + space is a simple zero-based enumeration. I.e. 0-1 for a 2-way multiplexer, + 0-7 for an 8-way multiplexer, etc. + + + Mux controller nodes + -------------------- + + Mux controller nodes must specify the number of cells used for the + specifier using the '#mux-control-cells' or '#mux-state-cells' property. + The value of '#mux-state-cells' will always be one greater than the value + of '#mux-control-cells'. + + Optionally, mux controller nodes can also specify the state the mux should + have when it is idle. The idle-state property is used for this. If the + idle-state is not present, the mux controller is typically left as is when + it is idle. For multiplexer chips that expose several mux controllers, the + idle-state property is an array with one idle state for each mux controller. + + The special value (-1) may be used to indicate that the mux should be left + as is when it is idle. This is the default, but can still be useful for + mux controller chips with more than one mux controller, particularly when + there is a need to "step past" a mux controller and set some other idle + state for a mux controller with a higher index. + + Some mux controllers have the ability to disconnect the input/output of the + multiplexer. Using this disconnected high-impedance state as the idle state + is indicated with idle state (-2). + + These constants are available in + + #include <dt-bindings/mux/mux.h> + + as MUX_IDLE_AS_IS (-1) and MUX_IDLE_DISCONNECT (-2). + + An example mux controller node look like this (the adg972a chip is a triple + 4-way multiplexer): + + mux: mux-controller@50 { + compatible = "adi,adg792a"; + reg = <0x50>; + #mux-control-cells = <1>; + + idle-state = <MUX_IDLE_DISCONNECT MUX_IDLE_AS_IS 2>; + }; + +select: + anyOf: + - properties: + $nodename: + pattern: '^mux-controller' + - required: + - '#mux-control-cells' + - required: + - '#mux-state-cells' + +properties: + $nodename: + pattern: '^mux-controller(@.*|-[0-9a-f]+)?$' + + '#mux-control-cells': + enum: [ 0, 1 ] + + '#mux-state-cells': + enum: [ 1, 2 ] + + idle-state: + $ref: /schemas/types.yaml#/definitions/int32 + minimum: -2 + + idle-states: + description: | + Mux controller nodes can specify the state the mux should have when it is + idle. If the idle-state is not present, the mux controller is typically + left as is when it is idle. For multiplexer chips that expose several mux + controllers, the idle-state property is an array with one idle state for + each mux controller. + + The special value (-1) may be used to indicate that the mux should be left + as is when it is idle. This is the default, but can still be useful for + mux controller chips with more than one mux controller, particularly when + there is a need to "step past" a mux controller and set some other idle + state for a mux controller with a higher index. + + Some mux controllers have the ability to disconnect the input/output of the + multiplexer. Using this disconnected high-impedance state as the idle state + is indicated with idle state (-2). + $ref: /schemas/types.yaml#/definitions/int32-array + items: + minimum: -2 + +additionalProperties: true + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + /* One consumer of a 2-way mux controller (one GPIO-line) */ + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + mux-control-names = "adc"; + + channels = "sync", "in"; + }; + + - | + #include <dt-bindings/gpio/gpio.h> + + /* + * Two consumers (one for an ADC line and one for an i2c bus) of + * parallel 4-way multiplexers controlled by the same two GPIO-lines. + */ + mux2: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux2>; + + channels = "sync-1", "in", "out", "sync-2"; + }; + + i2c-mux { + compatible = "i2c-mux"; + i2c-parent = <&i2c1>; + + mux-controls = <&mux2>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + + ssd1307: oled@3c { + reg = <0x3c>; + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + pca9555: pca9555@20 { + reg = <0x20>; + }; + }; + }; + + - | + #include <dt-bindings/gpio/gpio.h> + + mux1: mux-controller { + compatible = "gpio-mux"; + #mux-state-cells = <1>; + mux-gpios = <&exp_som 2 GPIO_ACTIVE_HIGH>; + }; + + transceiver4: can-phy4 { + compatible = "ti,tcan1042"; + #phy-cells = <0>; + max-bitrate = <5000000>; + standby-gpios = <&exp_som 7 GPIO_ACTIVE_HIGH>; + mux-states = <&mux1 1>; + }; +... diff --git a/Documentation/devicetree/bindings/mux/reg-mux.yaml b/Documentation/devicetree/bindings/mux/reg-mux.yaml new file mode 100644 index 000000000..dc4be092f --- /dev/null +++ b/Documentation/devicetree/bindings/mux/reg-mux.yaml @@ -0,0 +1,146 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mux/reg-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic register bitfield-based multiplexer controller + +maintainers: + - Peter Rosin <peda@axentia.se> + +description: |+ + Define register bitfields to be used to control multiplexers. The parent + device tree node must be a device node to provide register r/w access. + +properties: + compatible: + enum: + - reg-mux # parent device of mux controller is not syscon device + - mmio-mux # parent device of mux controller is syscon device + + reg: true + + '#mux-control-cells': + const: 1 + + mux-reg-masks: + $ref: /schemas/types.yaml#/definitions/uint32-matrix + items: + items: + - description: register offset + - description: pre-shifted bitfield mask + description: Each entry pair describes a single mux control. + + idle-states: true + +required: + - compatible + - mux-reg-masks + - '#mux-control-cells' + +additionalProperties: false + +examples: + - | + /* The parent device of mux controller is not a syscon device. */ + + #include <dt-bindings/mux/mux.h> + + mux-controller { + compatible = "reg-mux"; + #mux-control-cells = <1>; + mux-reg-masks = + <0x54 0xf8>, /* 0: reg 0x54, bits 7:3 */ + <0x54 0x07>; /* 1: reg 0x54, bits 2:0 */ + }; + + mdio-mux-1 { + compatible = "mdio-mux-multiplexer"; + mux-controls = <&mux1 0>; + mdio-parent-bus = <&emdio1>; + #address-cells = <1>; + #size-cells = <0>; + + mdio@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + }; + + mdio@8 { + reg = <0x8>; + #address-cells = <1>; + #size-cells = <0>; + }; + }; + + mdio-mux-2 { + compatible = "mdio-mux-multiplexer"; + mux-controls = <&mux1 1>; + mdio-parent-bus = <&emdio2>; + #address-cells = <1>; + #size-cells = <0>; + + mdio@0 { + reg = <0x0>; + #address-cells = <1>; + #size-cells = <0>; + }; + + mdio@1 { + reg = <0x1>; + #address-cells = <1>; + #size-cells = <0>; + }; + }; + + - | + /* The parent device of mux controller is syscon device. */ + + #include <dt-bindings/mux/mux.h> + syscon@1000 { + reg = <0x1000 0x100>; + + mux2: mux-controller { + compatible = "mmio-mux"; + #mux-control-cells = <1>; + + mux-reg-masks = + <0x3 0x30>, /* 0: reg 0x3, bits 5:4 */ + <0x3 0x40>; /* 1: reg 0x3, bit 6 */ + idle-states = <MUX_IDLE_AS_IS>, <0>; + }; + }; + + video-mux { + compatible = "video-mux"; + mux-controls = <&mux2 0>; + #address-cells = <1>; + #size-cells = <0>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + /* inputs 0..3 */ + port@0 { + reg = <0>; + }; + port@1 { + reg = <1>; + }; + port@2 { + reg = <2>; + }; + port@3 { + reg = <3>; + }; + + /* output */ + port@4 { + reg = <4>; + }; + }; + }; +... |