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dt-bindings: add register based devices' mux controller DT bindings

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This adds device tree binding documentation for generic register based
multiplexer controlled by a bitfields in a parent device's register range.

since MMIO mux is a special case of generic register based mux, the
MMIO mux bindings have been subsumed in these bindings.

Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pankaj Bansal 2019-06-12 08:52:56 +00:00 committed by Greg Kroah-Hartman
parent 1a044213fc
commit ae1c6b9aa3
2 changed files with 129 additions and 60 deletions
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60
Documentation/devicetree/bindings/mux/mmio-mux.txt
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MMIO register bitfield-based multiplexer controller bindings
Define register bitfields to be used to control multiplexers. The parent
device tree node must be a syscon node to provide register access.
Required properties:
- compatible : "mmio-mux"
- #mux-control-cells : <1>
- mux-reg-masks : an array of register offset and pre-shifted bitfield mask
pairs, each describing a single mux control.
* Standard mux-controller bindings as decribed in mux-controller.txt
Optional properties:
- idle-states : if present, the state the muxes will have when idle. The
special state MUX_IDLE_AS_IS is the default.
The multiplexer state of each multiplexer is defined as the value of the
bitfield described by the corresponding register offset and bitfield mask pair
in the mux-reg-masks array, accessed through the parent syscon.
Example:
syscon {
compatible = "syscon";
mux: 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 = <&mux 0>;
ports {
/* inputs 0..3 */
port@0 {
reg = <0>;
};
port@1 {
reg = <1>;
};
port@2 {
reg = <2>;
};
port@3 {
reg = <3>;
};
/* output */
port@4 {
reg = <4>;
};
};
};

129
Documentation/devicetree/bindings/mux/reg-mux.txt Normal file
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Generic register bitfield-based multiplexer controller bindings
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.
Required properties:
- compatible : should be one of
"reg-mux" : if parent device of mux controller is not syscon device
"mmio-mux" : if parent device of mux controller is syscon device
- #mux-control-cells : <1>
- mux-reg-masks : an array of register offset and pre-shifted bitfield mask
pairs, each describing a single mux control.
* Standard mux-controller bindings as decribed in mux-controller.txt
Optional properties:
- idle-states : if present, the state the muxes will have when idle. The
special state MUX_IDLE_AS_IS is the default.
The multiplexer state of each multiplexer is defined as the value of the
bitfield described by the corresponding register offset and bitfield mask
pair in the mux-reg-masks array.
Example 1:
The parent device of mux controller is not a syscon device.
&i2c0 {
fpga@66 { // fpga connected to i2c
compatible = "fsl,lx2160aqds-fpga", "fsl,fpga-qixis-i2c",
"simple-mfd";
reg = <0x66>;
mux: 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 = <&mux 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 = <&mux 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>;
};
..
..
};
Example 2:
The parent device of mux controller is syscon device.
syscon {
compatible = "syscon";
mux: 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 = <&mux 0>;
#address-cells = <1>;
#size-cells = <0>;
ports {
/* inputs 0..3 */
port@0 {
reg = <0>;
};
port@1 {
reg = <1>;
};
port@2 {
reg = <2>;
};
port@3 {
reg = <3>;
};
/* output */
port@4 {
reg = <4>;
};
};
};