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104 lines
2.8 KiB
Diff
104 lines
2.8 KiB
Diff
From a362c0ce64866939c3daa17c76943cfed555b065 Mon Sep 17 00:00:00 2001
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From: Sander Vanheule <sander@svanheule.net>
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Date: Tue, 30 Mar 2021 19:48:42 +0200
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Subject: dt-bindings: gpio: Binding for Realtek Otto GPIO
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Add a binding description for Realtek's GPIO controller found on several
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of their MIPS-based SoCs (codenamed Otto), such as the RTL838x and
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RTL839x series of switch SoCs.
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A fallback binding 'realtek,otto-gpio' is provided for cases where the
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actual port ordering is not known yet, and enabling the interrupt
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controller may result in uncaught interrupts.
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Signed-off-by: Sander Vanheule <sander@svanheule.net>
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Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
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Reviewed-by: Rob Herring <robh@kernel.org>
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Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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---
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.../bindings/gpio/realtek,otto-gpio.yaml | 78 ++++++++++++++++++++++
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1 file changed, 78 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
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@@ -0,0 +1,78 @@
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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+%YAML 1.2
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+---
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+$id: http://devicetree.org/schemas/gpio/realtek,otto-gpio.yaml#
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+$schema: http://devicetree.org/meta-schemas/core.yaml#
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+
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+title: Realtek Otto GPIO controller
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+
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+maintainers:
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+ - Sander Vanheule <sander@svanheule.net>
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+ - Bert Vermeulen <bert@biot.com>
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+
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+description: |
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+ Realtek's GPIO controller on their MIPS switch SoCs (Otto platform) consists
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+ of two banks of 32 GPIOs. These GPIOs can generate edge-triggered interrupts.
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+ Each bank's interrupts are cascased into one interrupt line on the parent
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+ interrupt controller, if provided.
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+ This binding allows defining a single bank in the devicetree. The interrupt
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+ controller is not supported on the fallback compatible name, which only
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+ allows for GPIO port use.
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+
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+properties:
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+ $nodename:
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+ pattern: "^gpio@[0-9a-f]+$"
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+
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+ compatible:
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+ items:
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+ - enum:
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+ - realtek,rtl8380-gpio
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+ - realtek,rtl8390-gpio
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+ - const: realtek,otto-gpio
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+
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+ reg:
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+ maxItems: 1
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+
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+ "#gpio-cells":
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+ const: 2
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+
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+ gpio-controller: true
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+
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+ ngpios:
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+ minimum: 1
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+ maximum: 32
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+
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+ interrupt-controller: true
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+
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+ "#interrupt-cells":
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+ const: 2
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+
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+ interrupts:
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+ maxItems: 1
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+
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+required:
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+ - compatible
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+ - reg
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+ - "#gpio-cells"
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+ - gpio-controller
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+
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+additionalProperties: false
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+
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+dependencies:
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+ interrupt-controller: [ interrupts ]
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+
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+examples:
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+ - |
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+ gpio@3500 {
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+ compatible = "realtek,rtl8380-gpio", "realtek,otto-gpio";
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+ reg = <0x3500 0x1c>;
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+ gpio-controller;
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+ #gpio-cells = <2>;
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+ ngpios = <24>;
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+ interrupt-controller;
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+ #interrupt-cells = <2>;
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+ interrupt-parent = <&rtlintc>;
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+ interrupts = <23>;
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+ };
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+
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+...
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