diff options
Diffstat (limited to 'Documentation/devicetree/bindings/i2c')
17 files changed, 406 insertions, 310 deletions
diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml new file mode 100644 index 000000000000..ea643e6c3ef5 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml @@ -0,0 +1,74 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/aspeed,i2c.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs Device Tree Bindings + +maintainers: + - Rayn Chen <rayn_chen@aspeedtech.com> + +allOf: + - $ref: /schemas/i2c/i2c-controller.yaml# + +properties: + compatible: + enum: + - aspeed,ast2400-i2c-bus + - aspeed,ast2500-i2c-bus + - aspeed,ast2600-i2c-bus + + reg: + minItems: 1 + items: + - description: address offset and range of bus + - description: address offset and range of bus buffer + + interrupts: + maxItems: 1 + + clocks: + maxItems: 1 + description: + root clock of bus, should reference the APB + clock in the second cell + + resets: + maxItems: 1 + + bus-frequency: + minimum: 500 + maximum: 4000000 + default: 100000 + description: frequency of the bus clock in Hz defaults to 100 kHz when not + specified + + multi-master: + type: boolean + description: + states that there is another master active on this bus + +required: + - reg + - compatible + - clocks + - resets + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/clock/aspeed-clock.h> + i2c0: i2c-bus@40 { + #address-cells = <1>; + #size-cells = <0>; + #interrupt-cells = <1>; + compatible = "aspeed,ast2500-i2c-bus"; + reg = <0x40 0x40>; + clocks = <&syscon ASPEED_CLK_APB>; + resets = <&syscon ASPEED_RESET_I2C>; + bus-frequency = <100000>; + interrupts = <0>; + interrupt-parent = <&i2c_ic>; + }; diff --git a/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml b/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml index edbca2476128..7070c04469ed 100644 --- a/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/brcm,brcmstb-i2c.yaml @@ -21,7 +21,6 @@ properties: reg: minItems: 1 - maxItems: 2 items: - description: BSC register range - description: Auto-I2C register range diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt deleted file mode 100644 index b47f6ccb196a..000000000000 --- a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt +++ /dev/null @@ -1,49 +0,0 @@ -Device tree configuration for the I2C busses on the AST24XX, AST25XX, and AST26XX SoCs. - -Required Properties: -- #address-cells : should be 1 -- #size-cells : should be 0 -- reg : address offset and range of bus -- compatible : should be "aspeed,ast2400-i2c-bus" - or "aspeed,ast2500-i2c-bus" - or "aspeed,ast2600-i2c-bus" -- clocks : root clock of bus, should reference the APB - clock in the second cell -- resets : phandle to reset controller with the reset number in - the second cell -- interrupts : interrupt number - -Optional Properties: -- bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not - specified -- multi-master : states that there is another master active on this bus. - -Example: - -i2c { - compatible = "simple-bus"; - #address-cells = <1>; - #size-cells = <1>; - ranges = <0 0x1e78a000 0x1000>; - - i2c_ic: interrupt-controller@0 { - #interrupt-cells = <1>; - compatible = "aspeed,ast2400-i2c-ic"; - reg = <0x0 0x40>; - interrupts = <12>; - interrupt-controller; - }; - - i2c0: i2c-bus@40 { - #address-cells = <1>; - #size-cells = <0>; - #interrupt-cells = <1>; - reg = <0x40 0x40>; - compatible = "aspeed,ast2400-i2c-bus"; - clocks = <&syscon ASPEED_CLK_APB>; - resets = <&syscon ASPEED_RESET_I2C>; - bus-frequency = <100000>; - interrupts = <0>; - interrupt-parent = <&i2c_ic>; - }; -}; diff --git a/Documentation/devicetree/bindings/i2c/i2c-davinci.txt b/Documentation/devicetree/bindings/i2c/i2c-davinci.txt index b745f3706120..6590501c53d4 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-davinci.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-davinci.txt @@ -8,7 +8,7 @@ Required properties: - reg : Offset and length of the register set for the device - clocks: I2C functional clock phandle. For 66AK2G this property should be set per binding, - Documentation/devicetree/bindings/clock/ti,sci-clk.txt + Documentation/devicetree/bindings/clock/ti,sci-clk.yaml SoC-specific Required Properties: @@ -17,7 +17,7 @@ The following are mandatory properties for Keystone 2 66AK2G SoCs only: - power-domains: Should contain a phandle to a PM domain provider node and an args specifier containing the I2C device id value. This property is as per the binding, - Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt + Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml Recommended properties : - interrupts : standard interrupt property. diff --git a/Documentation/devicetree/bindings/i2c/i2c-demux-pinctrl.txt b/Documentation/devicetree/bindings/i2c/i2c-demux-pinctrl.txt index 81b5d55086fa..86b2e433a969 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-demux-pinctrl.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-demux-pinctrl.txt @@ -27,7 +27,7 @@ Required properties: - i2c-bus-name: The name of this bus. Also needed as pinctrl-name for the I2C parents. -Furthermore, I2C mux properties and child nodes. See i2c-mux.txt in this +Furthermore, I2C mux properties and child nodes. See i2c-mux.yaml in this directory. Example: diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt index 21da3ecbb370..e00d2b9e957a 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt @@ -22,8 +22,8 @@ Required properties: - i2c-parent: The phandle of the I2C bus that this multiplexer's master-side port is connected to. - mux-gpios: list of gpios used to control the muxer -* Standard I2C mux properties. See i2c-mux.txt in this directory. -* I2C child bus nodes. See i2c-mux.txt in this directory. +* Standard I2C mux properties. See i2c-mux.yaml in this directory. +* I2C child bus nodes. See i2c-mux.yaml in this directory. Optional properties: - idle-state: value to set the muxer to when idle. When no value is diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt deleted file mode 100644 index 8b444b94e92f..000000000000 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.txt +++ /dev/null @@ -1,99 +0,0 @@ -General Purpose I2C Bus Mux - -This binding describes an I2C bus multiplexer that uses a mux controller -from the mux subsystem to route the I2C signals. - - .-----. .-----. - | dev | | dev | - .------------. '-----' '-----' - | SoC | | | - | | .--------+--------' - | .------. | .------+ child bus A, on MUX value set to 0 - | | I2C |-|--| Mux | - | '------' | '--+---+ child bus B, on MUX value set to 1 - | .------. | | '----------+--------+--------. - | | MUX- | | | | | | - | | Ctrl |-|-----+ .-----. .-----. .-----. - | '------' | | dev | | dev | | dev | - '------------' '-----' '-----' '-----' - -Required properties: -- compatible: i2c-mux -- i2c-parent: The phandle of the I2C bus that this multiplexer's master-side - port is connected to. -- mux-controls: The phandle of the mux controller to use for operating the - mux. -* Standard I2C mux properties. See i2c-mux.txt in this directory. -* I2C child bus nodes. See i2c-mux.txt in this directory. The sub-bus number - is also the mux-controller state described in ../mux/mux-controller.txt - -Optional properties: -- mux-locked: If present, explicitly allow unrelated I2C transactions on the - parent I2C adapter at these times: - + during setup of the multiplexer - + between setup of the multiplexer and the child bus I2C transaction - + between the child bus I2C transaction and releasing of the multiplexer - + during releasing of the multiplexer - However, I2C transactions to devices behind all I2C multiplexers connected - to the same parent adapter that this multiplexer is connected to are blocked - for the full duration of the complete multiplexed I2C transaction (i.e. - including the times covered by the above list). - If mux-locked is not present, the multiplexer is assumed to be parent-locked. - This means that no unrelated I2C transactions are allowed on the parent I2C - adapter for the complete multiplexed I2C transaction. - The properties of mux-locked and parent-locked multiplexers are discussed - in more detail in Documentation/i2c/i2c-topology.rst. - -For each i2c child node, an I2C child bus will be created. They will -be numbered based on their order in the device tree. - -Whenever an access is made to a device on a child bus, the value set -in the relevant node's reg property will be set as the state in the -mux controller. - -Example: - mux: mux-controller { - compatible = "gpio-mux"; - #mux-control-cells = <0>; - - mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, - <&pioA 1 GPIO_ACTIVE_HIGH>; - }; - - i2c-mux { - compatible = "i2c-mux"; - mux-locked; - i2c-parent = <&i2c1>; - - mux-controls = <&mux>; - - #address-cells = <1>; - #size-cells = <0>; - - i2c@1 { - reg = <1>; - #address-cells = <1>; - #size-cells = <0>; - - ssd1307: oled@3c { - compatible = "solomon,ssd1307fb-i2c"; - reg = <0x3c>; - pwms = <&pwm 4 3000>; - reset-gpios = <&gpio2 7 1>; - reset-active-low; - }; - }; - - i2c@3 { - reg = <3>; - #address-cells = <1>; - #size-cells = <0>; - - pca9555: pca9555@20 { - compatible = "nxp,pca9555"; - gpio-controller; - #gpio-cells = <2>; - reg = <0x20>; - }; - }; - }; diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.yaml new file mode 100644 index 000000000000..9b0603a72f40 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-gpmux.yaml @@ -0,0 +1,124 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/i2c-mux-gpmux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: General Purpose I2C Bus Mux + +maintainers: + - Peter Rosin <peda@axentia.se> + +description: |+ + This binding describes an I2C bus multiplexer that uses a mux controller + from the mux subsystem to route the I2C signals. + + .-----. .-----. + | dev | | dev | + .------------. '-----' '-----' + | SoC | | | + | | .--------+--------' + | .------. | .------+ child bus A, on MUX value set to 0 + | | I2C |-|--| Mux | + | '------' | '--+---+ child bus B, on MUX value set to 1 + | .------. | | '----------+--------+--------. + | | MUX- | | | | | | + | | Ctrl |-|-----+ .-----. .-----. .-----. + | '------' | | dev | | dev | | dev | + '------------' '-----' '-----' '-----' + + + +allOf: + - $ref: /schemas/i2c/i2c-mux.yaml# + +properties: + compatible: + const: i2c-mux + + i2c-parent: + $ref: /schemas/types.yaml#/definitions/phandle + description: + The phandle of the I2C bus that this multiplexer's master-side port is + connected to. + + mux-controls: + maxItems: 1 + description: + The mux-controller states are the I2C sub-bus numbers. + + mux-locked: + type: boolean + description: | + Explicitly allow unrelated I2C transactions on the parent I2C adapter at + these times: + - during setup of the multiplexer + - between setup of the multiplexer and the child bus I2C transaction + - between the child bus I2C transaction and releasing of the multiplexer + - during releasing of the multiplexer + + However, I2C transactions to devices behind all I2C multiplexers connected + to the same parent adapter that this multiplexer is connected to are blocked + for the full duration of the complete multiplexed I2C transaction (i.e. + including the times covered by the above list). + If mux-locked is not present, the multiplexer is assumed to be parent-locked. + This means that no unrelated I2C transactions are allowed on the parent I2C + adapter for the complete multiplexed I2C transaction. + The properties of mux-locked and parent-locked multiplexers are discussed + in more detail in Documentation/i2c/i2c-topology.rst. + +required: + - compatible + - i2c-parent + - mux-controls + +unevaluatedProperties: 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>; + }; + + i2c-mux { + compatible = "i2c-mux"; + mux-locked; + i2c-parent = <&i2c1>; + + mux-controls = <&mux>; + + #address-cells = <1>; + #size-cells = <0>; + + i2c@1 { + reg = <1>; + #address-cells = <1>; + #size-cells = <0>; + + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + + i2c@3 { + reg = <3>; + #address-cells = <1>; + #size-cells = <0>; + + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + }; +... diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt index 8b1e49cdce3f..29c4550c9782 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt @@ -8,8 +8,8 @@ Required Properties: The following required properties are defined externally: - - Standard I2C mux properties. See i2c-mux.txt in this directory. - - I2C child bus nodes. See i2c-mux.txt in this directory. + - Standard I2C mux properties. See i2c-mux.yaml in this directory. + - I2C child bus nodes. See i2c-mux.yaml in this directory. Optional Properties: diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt deleted file mode 100644 index 7abda506b828..000000000000 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt +++ /dev/null @@ -1,74 +0,0 @@ -* NXP PCA954x I2C bus switch - -The driver supports NXP PCA954x and PCA984x I2C mux/switch devices. - -Required Properties: - - - compatible: Must contain one of the following. - "nxp,pca9540", - "nxp,pca9542", - "nxp,pca9543", - "nxp,pca9544", - "nxp,pca9545", - "nxp,pca9546", "nxp,pca9846", - "nxp,pca9547", "nxp,pca9847", - "nxp,pca9548", "nxp,pca9848", - "nxp,pca9849" - - - reg: The I2C address of the device. - - The following required properties are defined externally: - - - Standard I2C mux properties. See i2c-mux.txt in this directory. - - I2C child bus nodes. See i2c-mux.txt in this directory. - -Optional Properties: - - - reset-gpios: Reference to the GPIO connected to the reset input. - - idle-state: if present, overrides i2c-mux-idle-disconnect, - Please refer to Documentation/devicetree/bindings/mux/mux-controller.txt - - i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all - children in idle state. This is necessary for example, if there are several - multiplexers on the bus and the devices behind them use same I2C addresses. - - interrupts: Interrupt mapping for IRQ. - - interrupt-controller: Marks the device node as an interrupt controller. - - #interrupt-cells : Should be two. - - first cell is the pin number - - second cell is used to specify flags. - See also Documentation/devicetree/bindings/interrupt-controller/interrupts.txt - -Example: - - i2c-switch@74 { - compatible = "nxp,pca9548"; - #address-cells = <1>; - #size-cells = <0>; - reg = <0x74>; - - interrupt-parent = <&ipic>; - interrupts = <17 IRQ_TYPE_LEVEL_LOW>; - interrupt-controller; - #interrupt-cells = <2>; - - i2c@2 { - #address-cells = <1>; - #size-cells = <0>; - reg = <2>; - - eeprom@54 { - compatible = "atmel,24c08"; - reg = <0x54>; - }; - }; - - i2c@4 { - #address-cells = <1>; - #size-cells = <0>; - reg = <4>; - - rtc@51 { - compatible = "nxp,pcf8563"; - reg = <0x51>; - }; - }; - }; diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml new file mode 100644 index 000000000000..9f1726d0356b --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml @@ -0,0 +1,110 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/i2c-mux-pca954x.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NXP PCA954x I2C bus switch + +maintainers: + - Laurent Pinchart <laurent.pinchart@ideasonboard.com> + +description: + The binding supports NXP PCA954x and PCA984x I2C mux/switch devices. + +allOf: + - $ref: /schemas/i2c/i2c-mux.yaml# + +properties: + compatible: + oneOf: + - enum: + - nxp,pca9540 + - nxp,pca9542 + - nxp,pca9543 + - nxp,pca9544 + - nxp,pca9545 + - nxp,pca9546 + - nxp,pca9547 + - nxp,pca9548 + - nxp,pca9846 + - nxp,pca9847 + - nxp,pca9848 + - nxp,pca9849 + - items: + - const: nxp,pca9646 + - const: nxp,pca9546 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + "#interrupt-cells": + const: 2 + + interrupt-controller: true + + reset-gpios: + maxItems: 1 + + i2c-mux-idle-disconnect: + type: boolean + description: Forces mux to disconnect all children in idle state. This is + necessary for example, if there are several multiplexers on the bus and + the devices behind them use same I2C addresses. + + idle-state: + description: if present, overrides i2c-mux-idle-disconnect + $ref: /schemas/mux/mux-controller.yaml#/properties/idle-state + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + + i2c { + #address-cells = <1>; + #size-cells = <0>; + + i2c-mux@74 { + compatible = "nxp,pca9548"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0x74>; + + interrupt-parent = <&ipic>; + interrupts = <17 IRQ_TYPE_LEVEL_LOW>; + interrupt-controller; + #interrupt-cells = <2>; + + i2c@2 { + #address-cells = <1>; + #size-cells = <0>; + reg = <2>; + + eeprom@54 { + compatible = "atmel,24c08"; + reg = <0x54>; + }; + }; + + i2c@4 { + #address-cells = <1>; + #size-cells = <0>; + reg = <4>; + + rtc@51 { + compatible = "nxp,pcf8563"; + reg = <0x51>; + }; + }; + }; + }; +... diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pinctrl.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pinctrl.txt index 33119a98e144..997a287ed3f6 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pinctrl.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pinctrl.txt @@ -28,9 +28,9 @@ Also required are: * Standard pinctrl properties that specify the pin mux state for each child bus. See ../pinctrl/pinctrl-bindings.txt. -* Standard I2C mux properties. See i2c-mux.txt in this directory. +* Standard I2C mux properties. See i2c-mux.yaml in this directory. -* I2C child bus nodes. See i2c-mux.txt in this directory. +* I2C child bus nodes. See i2c-mux.yaml in this directory. For each named state defined in the pinctrl-names property, an I2C child bus will be created. I2C child bus numbers are assigned based on the index into diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-reg.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-reg.txt index de00d7fc450b..b9d9755e4172 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-reg.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-reg.txt @@ -7,8 +7,8 @@ Required properties: - compatible: i2c-mux-reg - i2c-parent: The phandle of the I2C bus that this multiplexer's master-side port is connected to. -* Standard I2C mux properties. See i2c-mux.txt in this directory. -* I2C child bus nodes. See i2c-mux.txt in this directory. +* Standard I2C mux properties. See i2c-mux.yaml in this directory. +* I2C child bus nodes. See i2c-mux.yaml in this directory. Optional properties: - reg: this pair of <offset size> specifies the register to control the mux. diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux.txt b/Documentation/devicetree/bindings/i2c/i2c-mux.txt deleted file mode 100644 index b38f58a1c878..000000000000 --- a/Documentation/devicetree/bindings/i2c/i2c-mux.txt +++ /dev/null @@ -1,73 +0,0 @@ -Common i2c bus multiplexer/switch properties. - -An i2c bus multiplexer/switch will have several child busses that are -numbered uniquely in a device dependent manner. The nodes for an i2c bus -multiplexer/switch will have one child node for each child bus. - -Optional properties: -- #address-cells = <1>; - This property is required if the i2c-mux child node does not exist. - -- #size-cells = <0>; - This property is required if the i2c-mux child node does not exist. - -- i2c-mux - For i2c multiplexers/switches that have child nodes that are a mixture - of both i2c child busses and other child nodes, the 'i2c-mux' subnode - can be used for populating the i2c child busses. If an 'i2c-mux' - subnode is present, only subnodes of this will be considered as i2c - child busses. - -Required properties for the i2c-mux child node: -- #address-cells = <1>; -- #size-cells = <0>; - -Required properties for i2c child bus nodes: -- #address-cells = <1>; -- #size-cells = <0>; -- reg : The sub-bus number. - -Optional properties for i2c child bus nodes: -- Other properties specific to the multiplexer/switch hardware. -- Child nodes conforming to i2c bus binding - - -Example : - - /* - An NXP pca9548 8 channel I2C multiplexer at address 0x70 - with two NXP pca8574 GPIO expanders attached, one each to - ports 3 and 4. - */ - - mux@70 { - compatible = "nxp,pca9548"; - reg = <0x70>; - #address-cells = <1>; - #size-cells = <0>; - - i2c@3 { - #address-cells = <1>; - #size-cells = <0>; - reg = <3>; - - gpio1: gpio@38 { - compatible = "nxp,pca8574"; - reg = <0x38>; - #gpio-cells = <2>; - gpio-controller; - }; - }; - i2c@4 { - #address-cells = <1>; - #size-cells = <0>; - reg = <4>; - - gpio2: gpio@38 { - compatible = "nxp,pca8574"; - reg = <0x38>; - #gpio-cells = <2>; - gpio-controller; - }; - }; - }; diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux.yaml b/Documentation/devicetree/bindings/i2c/i2c-mux.yaml new file mode 100644 index 000000000000..24cac36037f5 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-mux.yaml @@ -0,0 +1,87 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/i2c-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Common i2c bus multiplexer/switch properties. + +maintainers: + - Peter Rosin <peda@axentia.se> + +description: |+ + An i2c bus multiplexer/switch will have several child busses that are numbered + uniquely in a device dependent manner. The nodes for an i2c bus + multiplexer/switch will have one child node for each child bus. + + For i2c multiplexers/switches that have child nodes that are a mixture of both + i2c child busses and other child nodes, the 'i2c-mux' subnode can be used for + populating the i2c child busses. If an 'i2c-mux' subnode is present, only + subnodes of this will be considered as i2c child busses. + +properties: + $nodename: + pattern: '^(i2c-?)?mux' + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + +patternProperties: + '^i2c@[0-9a-f]+$': + $ref: /schemas/i2c/i2c-controller.yaml + unevaluatedProperties: false + + properties: + reg: + description: The mux selector sub-bus number for the child I2C bus. + maxItems: 1 + +additionalProperties: true + +examples: + - | + /* + * An NXP pca9548 8 channel I2C multiplexer at address 0x70 + * with two NXP pca8574 GPIO expanders attached, one each to + * ports 3 and 4. + */ + i2c { + #address-cells = <1>; + #size-cells = <0>; + + i2c-mux@70 { + compatible = "nxp,pca9548"; + reg = <0x70>; + #address-cells = <1>; + #size-cells = <0>; + + i2c@3 { + #address-cells = <1>; + #size-cells = <0>; + reg = <3>; + + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + i2c@4 { + #address-cells = <1>; + #size-cells = <0>; + reg = <4>; + + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + }; + }; +... diff --git a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml index eb72dd571def..f771c09aabfc 100644 --- a/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml @@ -43,14 +43,12 @@ properties: clocks: minItems: 1 - maxItems: 2 items: - description: Reference clock for the I2C bus - description: Bus clock (Only for Armada 7K/8K) clock-names: minItems: 1 - maxItems: 2 items: - const: core - const: reg diff --git a/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.yaml b/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.yaml index d2b401d062b9..93198d5d43a6 100644 --- a/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.yaml +++ b/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.yaml @@ -20,7 +20,6 @@ properties: reg: minItems: 3 - maxItems: 4 items: - description: Smbus block registers - description: Cause master registers |