# 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@phrozen.org>
properties:
$nodename:
pattern: "^gpio@[0-9a-f]+$"
compatible:
const: lantiq,gpio-stp-xway
reg:
maxItems: 1
gpio-controller: true
"#gpio-cells":
description:
The first cell is the pin number and the second cell is used to specify
consumer flags.
const: 2
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.
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0x0
maximum: 0x3
lantiq,rising:
description:
Use rising instead of falling edge for the shift register.
type: boolean
patternProperties:
"^lantiq,phy[1-4]$":
description:
The gphy core can control 3 bits of the gpio cascade. In the xRX200 family
phy[1-2] are available, in xRX330 phy[1-3] and in XRX330 phy[1-4].
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0x0
maximum: 0x7
required:
- compatible
- reg
- gpio-controller
- "#gpio-cells"
additionalProperties: false
examples:
- |
gpio@e100bb0 {
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>;
};
...
