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Date: Mon, 17 May 2021 20:19:00 -0500
From: Rob Herring <robh@...nel.org>
To: Aleksander Jan Bajkowski <olek2@...pl>
Cc: linus.walleij@...aro.org, bgolaszewski@...libre.com,
john@...ozen.org, linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: gpio: stp: convert to json-schema
On Thu, May 13, 2021 at 11:03:39PM +0200, Aleksander Jan Bajkowski wrote:
> Convert the Lantiq STP Device Tree binding documentation to json-schema.
> Add the missing pinctrl property.
>
> Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>
> ---
> .../bindings/gpio/gpio-stp-xway.txt | 42 -------
> .../bindings/gpio/gpio-stp-xway.yaml | 117 ++++++++++++++++++
> 2 files changed, 117 insertions(+), 42 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/gpio/gpio-stp-xway.txt
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-stp-xway.yaml
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-stp-xway.txt b/Documentation/devicetree/bindings/gpio/gpio-stp-xway.txt
> deleted file mode 100644
> index 78458adbf4b7..000000000000
> --- a/Documentation/devicetree/bindings/gpio/gpio-stp-xway.txt
> +++ /dev/null
> @@ -1,42 +0,0 @@
> -Lantiq SoC Serial To Parallel (STP) GPIO controller
> -
> -The Serial To Parallel (STP) is found on MIPS based Lantiq socs. It is a
> -peripheral controller used to drive external shift register cascades. At most
> -3 groups of 8 bits can be driven. The hardware is able to allow the DSL modem
> -to drive the 2 LSBs of the cascade automatically.
> -
> -
> -Required properties:
> -- compatible : Should be "lantiq,gpio-stp-xway"
> -- reg : Address and length of the register set for the device
> -- #gpio-cells : Should be two. The first cell is the pin number and
> - the second cell is used to specify optional parameters (currently
> - unused).
> -- gpio-controller : Marks the device node as a gpio controller.
> -
> -Optional properties:
> -- lantiq,shadow : The default value that we shall assume as already set on the
> - shift register cascade.
> -- lantiq,groups : Set the 3 bit mask to select which of the 3 groups are enabled
> - in the shift register cascade.
> -- lantiq,dsl : The dsl core can control the 2 LSBs of the gpio cascade. This 2 bit
> - property can enable this feature.
> -- lantiq,phy1 : The gphy1 core can control 3 bits of the gpio cascade.
> -- lantiq,phy2 : The gphy2 core can control 3 bits of the gpio cascade.
> -- lantiq,rising : use rising instead of falling edge for the shift register
> -
> -Example:
> -
> -gpio1: stp@...0bb0 {
> - compatible = "lantiq,gpio-stp-xway";
> - reg = <0xE100BB0 0x40>;
> - #gpio-cells = <2>;
> - gpio-controller;
> -
> - lantiq,shadow = <0xffff>;
> - lantiq,groups = <0x7>;
> - lantiq,dsl = <0x3>;
> - lantiq,phy1 = <0x7>;
> - lantiq,phy2 = <0x7>;
> - /* lantiq,rising; */
> -};
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-stp-xway.yaml b/Documentation/devicetree/bindings/gpio/gpio-stp-xway.yaml
> new file mode 100644
> index 000000000000..a36acc98898c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-stp-xway.yaml
> @@ -0,0 +1,117 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/gpio-stp-xway.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Lantiq SoC Serial To Parallel (STP) GPIO controller
> +
> +description: |
> + The Serial To Parallel (STP) is found on MIPS based Lantiq socs. It is a
> + peripheral controller used to drive external shift register cascades. At most
> + 3 groups of 8 bits can be driven. The hardware is able to allow the DSL modem
> + and Ethernet PHYs to drive some bytes of the cascade automatically.
> +
> +maintainers:
> + - John Crispin <john@...ozen.org>
> +
> +properties:
> + $nodename:
> + pattern: "^stp@[0-9a-f]+$"
gpio@...
> +
> + compatible:
> + const: lantiq,gpio-stp-xway
> +
> + reg:
> + description:
> + Address and length of the register set for the device.
> + maxItems: 1
> +
> + gpio-controller:
> + description:
> + Marks the device node as a gpio controller.
> + type: boolean
Just:
gpio-controller: true
This property already has a type and description.
> +
> + "#gpio-cells":
> + description:
> + The first cell is the pin number and the second cell is used to specify
> + consumer flags.
> + const: 2
> +
> + pinctrl-0:
> + description: Should specify pin control groups used for this controller.
> +
> + pinctrl-names:
> + const: default
You can drop these. They are supported by default.
> +
> + lantiq,shadow:
> + description:
> + The default value that we shall assume as already set on the
> + shift register cascade.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0x000000
> + maximum: 0xffffff
> +
> + lantiq,groups:
> + description:
> + Set the 3 bit mask to select which of the 3 groups are enabled
> + in the shift register cascade.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0x0
> + maximum: 0x7
> +
> + lantiq,dsl:
> + description:
> + The dsl core can control the 2 LSBs of the gpio cascade. This 2 bit
> + property can enable this feature.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0x0
> + maximum: 0x3
> +
> + lantiq,phy1:
> + description:
> + The gphy1 core can control 3 bits of the gpio cascade. Available on
> + the xRX200, xRX300 and xRX330 family.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0x0
> + maximum: 0x7
> +
> + lantiq,phy2:
> + description:
> + The gphy2 core can control 3 bits of the gpio cascade. Available on
> + the xRX200, xRX300 and xRX330 family.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0x0
> + maximum: 0x7
> +
> + lantiq,rising:
> + description:
> + Use rising instead of falling edge for the shift register.
> + type: boolean
> +
> +required:
> + - compatible
> + - reg
> + - gpio-controller
> + - "#gpio-cells"
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + stp: stp@...0bb0 {
> + compatible = "lantiq,gpio-stp-xway";
> + reg = <0xE100BB0 0x40>;
> + #gpio-cells = <2>;
> + gpio-controller;
> +
> + pinctrl-0 = <&stp_pins>;
> + pinctrl-names = "default";
> +
> + lantiq,shadow = <0xffffff>;
> + lantiq,groups = <0x7>;
> + lantiq,dsl = <0x3>;
> + lantiq,phy1 = <0x7>;
> + lantiq,phy2 = <0x7>;
> + };
> +...
> --
> 2.30.2
>
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