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