Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: Add DT bindings for apple,pinctrl

From: Rob Herring <[email-masked]>
Date: Mon, 10 May 2021 09:19:55 -0500

On Sat, May 08, 2021 at 04:19:55PM +0200, Mark Kettenis wrote:
> The Apple GPIO controller is a simple combined pin and GPIO conroller
> present on Apple ARM SoC platforms, including various iPhone and iPad
> devices and the "Apple Silicon" Macs.
> 
> Signed-off-by: Mark Kettenis <[email-masked]>
> ---
>  .../bindings/pinctrl/apple,pinctrl.yaml       | 103 ++++++++++++++++++
>  MAINTAINERS                                   |   2 +
>  include/dt-bindings/pinctrl/apple.h           |  13 +++
>  3 files changed, 118 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
>  create mode 100644 include/dt-bindings/pinctrl/apple.h
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
> new file mode 100644
> index 000000000000..cc7805ca6ba1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/apple,pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple GPIO controller
> +
> +maintainers:
> +  - Mark Kettenis <[email-masked]>
> +
> +description: |
> +  The Apple GPIO controller is a simple combined pin and GPIO conroller
> +  present on Apple ARM SoC platforms, including various iPhone and iPad
> +  devices and the "Apple Silicon" Macs.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: apple,t8103-pinctrl
> +      - const: apple,pinctrl

A genericish fallback is maybe questionable for pinctrl. That's not 
often the same from one SoC to the next.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 2
> +
> +  gpio-ranges:
> +    maxItems: 1
> +
> +  interrupts:
> +    minItems: 1
> +    maxItems: 7
> +
> +  interrupt-controller: true
> +
> +patternProperties:
> +  '-pins$':
> +    type: object
> +    $ref: pinmux-node.yaml#
> +
> +    properties:
> +      pinmux:
> +        description:
> +          Values are constructed from pin number and alternate function
> +          configuration number using the APPLE_PINMUX() helper macro
> +          defined in include/dt-bindings/pinctrl/apple.h.
> +
> +    required:
> +      - pinmux
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - gpio-controller
> +  - '#gpio-cells'
> +  - gpio-ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/apple-aic.h>
> +    #include <dt-bindings/pinctrl/apple.h>
> +
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      pinctrl: pinctrl@23c100000 {
> +        compatible = "apple,t8103-pinctrl", "apple,pinctrl";
> +        reg = <0x2 0x3c100000 0x0 0x100000>;
> +        clocks = <&gpio_clk>;
> +
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        gpio-ranges = <&pinctrl 0 0 212>;
> +
> +        interrupt-controller;
> +        interrupt-parent = <&aic>;
> +        interrupts = <AIC_IRQ 16 IRQ_TYPE_LEVEL_HIGH>,
> +                     <AIC_IRQ 17 IRQ_TYPE_LEVEL_HIGH>,
> +                     <AIC_IRQ 18 IRQ_TYPE_LEVEL_HIGH>,
> +                     <AIC_IRQ 19 IRQ_TYPE_LEVEL_HIGH>,
> +                     <AIC_IRQ 20 IRQ_TYPE_LEVEL_HIGH>,
> +                     <AIC_IRQ 21 IRQ_TYPE_LEVEL_HIGH>,
> +                     <AIC_IRQ 22 IRQ_TYPE_LEVEL_HIGH>;
> +
> +        pcie_pins: pcie-pins {
> +          pinmux = <APPLE_PINMUX(150, 1)>,
> +                   <APPLE_PINMUX(151, 1)>,
> +                   <APPLE_PINMUX(32, 1)>;
> +        };
> +      };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ad0e9be66885..7327c9b778f1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1654,9 +1654,11 @@ C:	irc://chat.freenode.net/asahi-dev
>  T:	git https://github.com/AsahiLinux/linux.git
>  F:	Documentation/devicetree/bindings/arm/apple.yaml
>  F:	Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
> +F:	Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
>  F:	arch/arm64/boot/dts/apple/
>  F:	drivers/irqchip/irq-apple-aic.c
>  F:	include/dt-bindings/interrupt-controller/apple-aic.h
> +F:	include/dt-bindings/pinctrl/apple.h
>  
>  ARM/ARTPEC MACHINE SUPPORT
>  M:	Jesper Nilsson <[email-masked]>
> diff --git a/include/dt-bindings/pinctrl/apple.h b/include/dt-bindings/pinctrl/apple.h
> new file mode 100644
> index 000000000000..ea0a6f466592
> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/apple.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0+ OR MIT */
> +/*
> + * This header provides constants for Apple pinctrl bindings.
> + */
> +
> +#ifndef _DT_BINDINGS_PINCTRL_APPLE_H
> +#define _DT_BINDINGS_PINCTRL_APPLE_H
> +
> +#define APPLE_PINMUX(pin, func) ((pin) | ((func) << 16))
> +#define APPLE_PIN(pinmux) ((pinmux) & 0xffff)
> +#define APPLE_FUNC(pinmux) ((pinmux) >> 16)
> +
> +#endif /* _DT_BINDINGS_PINCTRL_APPLE_H */
> -- 
> 2.31.1
> 

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