Re: [PATCH v4 02/10] dt-bindings: pinctrl: Add RaspberryPi RP1 gpio/pinctrl/pinmux bindings

[Stefan Wahren <wahrenst@gmx.net>]

Hi Andrea,

Am 24.11.24 um 11:51 schrieb Andrea della Porta:
> Add device tree bindings for the gpio/pin/mux controller that is part of
> the RP1 multi function device, and relative entries in MAINTAINERS file.
>
> Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
> ---
>   .../pinctrl/raspberrypi,rp1-gpio.yaml         | 193 ++++++++++++++++++
>   MAINTAINERS                                   |   2 +
>   2 files changed, 195 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml b/Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
> new file mode 100644
> index 000000000000..21923d39c1bc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
> @@ -0,0 +1,193 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/raspberrypi,rp1-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: RaspberryPi RP1 GPIO/Pinconf/Pinmux Controller submodule
> +
> +maintainers:
> +  - Andrea della Porta <andrea.porta@suse.com>
> +
> +description:
> +  The RP1 chipset is a Multi Function Device containing, among other
> +  sub-peripherals, a gpio/pinconf/mux controller whose 54 pins are grouped
> +  into 3 banks.
> +  It works also as an interrupt controller for those gpios.
> +
> +properties:
> +  compatible:
> +    const: raspberrypi,rp1-gpio
> +
> +  reg:
> +    maxItems: 3
> +    description: One reg specifier for each one of the 3 pin banks.
> +
> +  '#gpio-cells':
> +    description: The first cell is the pin number and the second cell is used
> +      to specify the flags (see include/dt-bindings/gpio/gpio.h).
> +    const: 2
> +
> +  gpio-controller: true
> +
> +  gpio-ranges:
> +    maxItems: 1
> +
> +  gpio-line-names:
> +    maxItems: 54
> +
> +  interrupts:
> +    maxItems: 3
> +    description: One interrupt specifier for each one of the 3 pin banks.
> +
> +  '#interrupt-cells':
> +    description:
> +      Specifies the Bank number [0, 1, 2] and Flags as defined in
> +      include/dt-bindings/interrupt-controller/irq.h.
> +    const: 2
> +
> +  interrupt-controller: true
> +
> +patternProperties:
> +  "-state$":
> +    oneOf:
> +      - $ref: "#/$defs/raspberrypi-rp1-state"
> +      - patternProperties:
> +          "-pins$":
> +            $ref: "#/$defs/raspberrypi-rp1-state"
> +        additionalProperties: false
> +
> +$defs:
> +  raspberrypi-rp1-state:
> +    allOf:
> +      - $ref: pincfg-node.yaml#
> +      - $ref: pinmux-node.yaml#
> +
> +    description:
> +      Pin controller client devices use pin configuration subnodes (children
> +      and grandchildren) for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +
> +    properties:
> +      pins:
> +        description:
> +          List of gpio pins affected by the properties specified in this
> +          subnode.
> +        items:
> +          pattern: "^gpio([0-9]|[1-5][0-9])$"
> +
> +      function:
> +        enum: [ alt0, alt1, alt2, alt3, alt4, gpio, alt6, alt7, alt8, none,
> +                aaud, dcd0, dpi, dsi0_te_ext, dsi1_te_ext, dsr0, dtr0, gpclk0,
> +                gpclk1, gpclk2, gpclk3, gpclk4, gpclk5, i2c0, i2c1, i2c2, i2c3,
> +                i2c4, i2c5, i2c6, i2s0, i2s1, i2s2, ir, mic, pcie_clkreq_n,
> +                pio, proc_rio, pwm0, pwm1, ri0, sd0, sd1, spi0, spi1, spi2,
> +                spi3, spi4, spi5, spi6, spi7, spi8, uart0, uart1, uart2, uart3,
> +                uart4, uart5, vbus0, vbus1, vbus2, vbus3 ]
> +
> +        description:
> +          Specify the alternative function to be configured for the specified
> +          pins.
> +
> +      bias-disable: true
> +      bias-pull-down: true
> +      bias-pull-up: true
> +      slew-rate:
> +        description: 0 is slow slew rate, 1 is fast slew rate
> +        enum: [ 0, 1 ]
> +      drive-strength:
> +        enum: [ 2, 4, 8, 12 ]
according to the driver in patch 4 the following should also be
supported by the hardware:

input-enable, input-schmitt-enable, output-enable, output-low, output-high
> +
> +    additionalProperties: false
> +
> +allOf:
> +  - $ref: pinctrl.yaml#
> +
> +required:
> +  - reg
> +  - compatible
> +  - '#gpio-cells'
> +  - gpio-controller
> +  - interrupts
> +  - '#interrupt-cells'
> +  - interrupt-controller
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    rp1 {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        rp1_gpio: pinctrl@c0400d0000 {
> +            reg = <0xc0 0x400d0000  0x0 0xc000>,
> +                  <0xc0 0x400e0000  0x0 0xc000>,
> +                  <0xc0 0x400f0000  0x0 0xc000>;
> +            compatible = "raspberrypi,rp1-gpio";
> +            gpio-controller;
> +            #gpio-cells = <2>;
> +            interrupt-controller;
> +            #interrupt-cells = <2>;
> +            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
> +                         <1 IRQ_TYPE_LEVEL_HIGH>,
> +                         <2 IRQ_TYPE_LEVEL_HIGH>;
> +            gpio-line-names =
> +                   "ID_SDA", // GPIO0
> +                   "ID_SCL", // GPIO1
> +                   "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6",
> +                   "GPIO7", "GPIO8", "GPIO9", "GPIO10", "GPIO11",
> +                   "GPIO12", "GPIO13", "GPIO14", "GPIO15", "GPIO16",
> +                   "GPIO17", "GPIO18", "GPIO19", "GPIO20", "GPIO21",
> +                   "GPIO22", "GPIO23", "GPIO24", "GPIO25", "GPIO26",
> +                   "GPIO27",
> +                   "PCIE_RP1_WAKE", // GPIO28
> +                   "FAN_TACH", // GPIO29
> +                   "HOST_SDA", // GPIO30
> +                   "HOST_SCL", // GPIO31
> +                   "ETH_RST_N", // GPIO32
> +                   "", // GPIO33
> +                   "CD0_IO0_MICCLK", // GPIO34
> +                   "CD0_IO0_MICDAT0", // GPIO35
> +                   "RP1_PCIE_CLKREQ_N", // GPIO36
> +                   "", // GPIO37
> +                   "CD0_SDA", // GPIO38
> +                   "CD0_SCL", // GPIO39
> +                   "CD1_SDA", // GPIO40
> +                   "CD1_SCL", // GPIO41
> +                   "USB_VBUS_EN", // GPIO42
> +                   "USB_OC_N", // GPIO43
> +                   "RP1_STAT_LED", // GPIO44
> +                   "FAN_PWM", // GPIO45
> +                   "CD1_IO0_MICCLK", // GPIO46
> +                   "2712_WAKE", // GPIO47
> +                   "CD1_IO1_MICDAT1", // GPIO48
> +                   "EN_MAX_USB_CUR", // GPIO49
> +                   "", // GPIO50
> +                   "", // GPIO51
> +                   "", // GPIO52
> +                   ""; // GPIO53
> +
> +            rp1-i2s0-default-state {
> +                function = "i2s0";
> +                pins = "gpio18", "gpio19", "gpio20", "gpio21";
> +                bias-disable;
> +            };
> +
> +            rp1-uart0-default-state {
> +                txd-pins {
> +                    function = "uart0";
> +                    pins = "gpio14";
> +                    bias-disable;
> +                };
> +
> +                rxd-pins {
> +                    function = "uart0";
> +                    pins = "gpio15";
> +                    bias-pull-up;
> +                };
> +            };
> +        };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 75a66e3e34c9..c55d12550246 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19384,7 +19384,9 @@ RASPBERRY PI RP1 PCI DRIVER
>   M:	Andrea della Porta <andrea.porta@suse.com>
>   S:	Maintained
>   F:	Documentation/devicetree/bindings/clock/raspberrypi,rp1-clocks.yaml
> +F:	Documentation/devicetree/bindings/pinctrl/raspberrypi,rp1-gpio.yaml
>   F:	include/dt-bindings/clock/rp1.h
> +F:	include/dt-bindings/misc/rp1.h
>
>   RC-CORE / LIRC FRAMEWORK
>   M:	Sean Young <sean@mess.org>