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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/pinctrl/pinmux-node.yaml | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | Documentation/devicetree/bindings/pinctrl/pinmux-node.yaml | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/pinmux-node.yaml b/Documentation/devicetree/bindings/pinctrl/pinmux-node.yaml new file mode 100644 index 000000000..551df3d9b --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/pinmux-node.yaml @@ -0,0 +1,133 @@ +# SPDX-License-Identifier: GPL-2.0-only +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/pinmux-node.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic pin multiplexing node schema + +maintainers: + - Linus Walleij <linus.walleij@linaro.org> + +description: | + The contents of the pin configuration child nodes are defined by the binding + for the individual pin controller device. The pin configuration nodes need not + be direct children of the pin controller device; they may be grandchildren, + for example. Whether this is legal, and whether there is any interaction + between the child and intermediate parent nodes, is again defined entirely by + the binding for the individual pin controller device. + + While not required to be used, there are 3 generic forms of pin muxing nodes + which pin controller devices can use. + + pin multiplexing nodes: + + Example: + + state_0_node_a { + uart0 { + function = "uart0"; + groups = "u0rxtx", "u0rtscts"; + }; + }; + state_1_node_a { + spi0 { + function = "spi0"; + groups = "spi0pins"; + }; + }; + state_2_node_a { + function = "i2c0"; + pins = "mfio29", "mfio30"; + }; + + Optionally an alternative binding can be used if more suitable depending on the + pin controller hardware. For hardware where there is a large number of identical + pin controller instances, naming each pin and function can easily become + unmaintainable. This is especially the case if the same controller is used for + different pins and functions depending on the SoC revision and packaging. + + For cases like this, the pin controller driver may use pinctrl-pin-array helper + binding with a hardware based index and a number of pin configuration values: + + pincontroller { + ... /* Standard DT properties for the device itself elided */ + #pinctrl-cells = <2>; + + state_0_node_a { + pinctrl-pin-array = < + 0 A_DELAY_PS(0) G_DELAY_PS(120) + 4 A_DELAY_PS(0) G_DELAY_PS(360) + ... + >; + }; + ... + }; + + Above #pinctrl-cells specifies the number of value cells in addition to the + index of the registers. This is similar to the interrupts-extended binding with + one exception. There is no need to specify the phandle for each entry as that + is already known as the defined pins are always children of the pin controller + node. Further having the phandle pointing to another pin controller would not + currently work as the pinctrl framework uses named modes to group pins for each + pin control device. + + The index for pinctrl-pin-array must relate to the hardware for the pinctrl + registers, and must not be a virtual index of pin instances. The reason for + this is to avoid mapping of the index in the dts files and the pin controller + driver as it can change. + + For hardware where pin multiplexing configurations have to be specified for + each single pin the number of required sub-nodes containing "pin" and + "function" properties can quickly escalate and become hard to write and + maintain. + + For cases like this, the pin controller driver may use the pinmux helper + property, where the pin identifier is provided with mux configuration settings + in a pinmux group. A pinmux group consists of the pin identifier and mux + settings represented as a single integer or an array of integers. + + The pinmux property accepts an array of pinmux groups, each of them describing + a single pin multiplexing configuration. + + pincontroller { + state_0_node_a { + pinmux = <PINMUX_GROUP>, <PINMUX_GROUP>, ...; + }; + }; + + Each individual pin controller driver bindings documentation shall specify + how pin IDs and pin multiplexing configuration are defined and assembled + together in a pinmux group. + +properties: + function: + $ref: /schemas/types.yaml#/definitions/string + description: The mux function to select + + pins: + oneOf: + - $ref: /schemas/types.yaml#/definitions/uint32-array + - $ref: /schemas/types.yaml#/definitions/string-array + description: + The list of pin identifiers that properties in the node apply to. The + specific binding for the hardware defines whether the entries are integers + or strings, and their meaning. + + groups: + $ref: /schemas/types.yaml#/definitions/string-array + description: + the group to apply the properties to, if the driver supports + configuration of whole groups rather than individual pins (either + this, "pins" or "pinmux" has to be specified) + + pinmux: + description: + The list of numeric pin ids and their mux settings that properties in the + node apply to (either this, "pins" or "groups" have to be specified) + $ref: /schemas/types.yaml#/definitions/uint32-array + + pinctrl-pin-array: + $ref: /schemas/types.yaml#/definitions/uint32-array + +additionalProperties: true |