This binding is heavily based on the one for NPCM7xx, because the hardware is similar. There are some notable differences, however: - The addresses of GPIO banks are not physical addresses but simple indices (0 to 7), because the GPIO registers are not laid out in convenient blocks. - Pinmux settings can explicitly specify that the GPIO mode is used. Certain pins support blink patterns in hardware. This is currently not modelled in the DT binding. Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@xxxxxxx> --- v3: - Make changes suggested by Rob Herring - Fix lint errors - Simplify child node patterns - Remove if/type=object/then trick - Reduce interrupts.maxItems to 3: 4 aren't necessary - Replace list of gpio0/1/2/etc. with pattern - Remove nuvoton,interrupt-map again, to simplify the binding - Make tuples clearer v2: - https://lore.kernel.org/lkml/20211207210823.1975632-5-j.neuschaefer@xxxxxxx/ - Move GPIO into subnodes - Improve use of quotes - Remove unnecessary minItems/maxItems lines - Remove "phandle: true" - Use separate prefixes for pinmux and pincfg nodes - Add nuvoton,interrupt-map property - Make it possible to set pinmux to GPIO explicitly v1: - https://lore.kernel.org/lkml/20210602120329.2444672-5-j.neuschaefer@xxxxxxx/ --- .../pinctrl/nuvoton,wpcm450-pinctrl.yaml | 159 ++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 Documentation/devicetree/bindings/pinctrl/nuvoton,wpcm450-pinctrl.yaml diff --git a/Documentation/devicetree/bindings/pinctrl/nuvoton,wpcm450-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/nuvoton,wpcm450-pinctrl.yaml new file mode 100644 index 0000000000000..2d15737b5815e --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/nuvoton,wpcm450-pinctrl.yaml @@ -0,0 +1,159 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pinctrl/nuvoton,wpcm450-pinctrl.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Nuvoton WPCM450 pin control and GPIO + +maintainers: + - Jonathan Neuschäfer <j.neuschaefer@xxxxxxx> + +properties: + compatible: + const: nuvoton,wpcm450-pinctrl + + reg: + maxItems: 1 + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + +patternProperties: + # There are three kinds of subnodes: + # 1. a GPIO controller node for each GPIO bank + # 2. a pinmux node configures pin muxing for a group of pins (e.g. rmii2) + # 3. a pinconf node configures properties of a single pin + + "^gpio": + type: object + + description: + Eight GPIO banks (gpio@0 to gpio@7), that each contain between 14 and 18 + GPIOs. Some GPIOs support interrupts. + + properties: + reg: + description: GPIO bank number (0-7) + + gpio-controller: true + + "#gpio-cells": + const: 2 + + interrupt-controller: true + + "#interrupt-cells": + const: 2 + + interrupts: + maxItems: 3 + description: + The interrupts associated with this GPIO bank + + required: + - reg + - gpio-controller + - '#gpio-cells' + + "^mux-": + $ref: pinmux-node.yaml# + + properties: + groups: + description: + One or more groups of pins to mux to a certain function + items: + enum: [ smb3, smb4, smb5, scs1, scs2, scs3, smb0, smb1, smb2, bsp, + hsp1, hsp2, r1err, r1md, rmii2, r2err, r2md, kbcc, dvo, + clko, smi, uinc, gspi, mben, xcs2, xcs1, sdio, sspi, fi0, + fi1, fi2, fi3, fi4, fi5, fi6, fi7, fi8, fi9, fi10, fi11, + fi12, fi13, fi14, fi15, pwm0, pwm1, pwm2, pwm3, pwm4, pwm5, + pwm6, pwm7, hg0, hg1, hg2, hg3, hg4, hg5, hg6, hg7 ] + function: + description: + The function that a group of pins is muxed to + enum: [ smb3, smb4, smb5, scs1, scs2, scs3, smb0, smb1, smb2, bsp, + hsp1, hsp2, r1err, r1md, rmii2, r2err, r2md, kbcc, dvo0, + dvo1, dvo2, dvo3, dvo4, dvo5, dvo6, dvo7, clko, smi, uinc, + gspi, mben, xcs2, xcs1, sdio, sspi, fi0, fi1, fi2, fi3, fi4, + fi5, fi6, fi7, fi8, fi9, fi10, fi11, fi12, fi13, fi14, fi15, + pwm0, pwm1, pwm2, pwm3, pwm4, pwm5, pwm6, pwm7, hg0, hg1, + hg2, hg3, hg4, hg5, hg6, hg7, gpio ] + + dependencies: + groups: [ function ] + function: [ groups ] + + additionalProperties: false + + "^cfg-": + $ref: pincfg-node.yaml# + + properties: + pins: + description: + A list of pins to configure in certain ways, such as enabling + debouncing + items: + pattern: "^gpio1?[0-9]{1,2}$" + + input-debounce: true + + additionalProperties: false + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/irq.h> + #include <dt-bindings/gpio/gpio.h> + pinctrl: pinctrl@b8003000 { + compatible = "nuvoton,wpcm450-pinctrl"; + reg = <0xb8003000 0x1000>; + #address-cells = <1>; + #size-cells = <0>; + + gpio0: gpio@0 { + reg = <0>; + gpio-controller; + #gpio-cells = <2>; + interrupts = <2 IRQ_TYPE_LEVEL_HIGH>, + <3 IRQ_TYPE_LEVEL_HIGH>, + <4 IRQ_TYPE_LEVEL_HIGH>; + }; + + mux-rmii2 { + groups = "rmii2"; + function = "rmii2"; + }; + + pinmux_uid: mux-uid { + groups = "gspi", "sspi"; + function = "gpio"; + }; + + pinctrl_uid: cfg-uid { + pins = "gpio14"; + input-debounce = <1>; + }; + }; + + gpio-keys { + compatible = "gpio-keys"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uid>, <&pinmux_uid>; + + uid { + label = "UID"; + linux,code = <102>; + gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>; + }; + }; -- 2.30.2
