[PATCH 1/3] dt-bindings: clock: add DT bindings for apple,gate-clock

From: Sven Peter
Date: Mon May 24 2021 - 14:28:08 EST


These gated clocks are found on Apple SoCs, such as the M1, and
are required to enable access to MMIO regions of various peripherals.

Signed-off-by: Sven Peter <sven@xxxxxxxxxxxxx>
---
.../bindings/clock/apple,gate-clock.yaml | 60 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 61 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/apple,gate-clock.yaml

diff --git a/Documentation/devicetree/bindings/clock/apple,gate-clock.yaml b/Documentation/devicetree/bindings/clock/apple,gate-clock.yaml
new file mode 100644
index 000000000000..3aae47c40b42
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/apple,gate-clock.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/apple,gate-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binding for Apple clock gates
+
+maintainers:
+ - Sven Peter <sven@xxxxxxxxxxxxx>
+
+description: |
+ Apple SoC's such as the M1 contain various clock gates.
+ These clock gates do not have a frequency associated with them and are only
+ used to power on/off various peripherals. Generally, a clock gate needs to
+ be enabled before the respective MMIO region can be accessed.
+
+ Each clock gate is configured by a single 32bit MMIO register which contains
+ the actual and the target state. The state is encoded as four bits but
+ right now only "powered on" / 0b1111 and "powered off" / 0b0000 are used.
+
+
+properties:
+ compatible:
+ enum:
+ - apple,t8103-gate-clock
+ - apple,gate-clock
+
+ "#clock-cells":
+ const: 0
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ clock-names:
+ maxItems: 1
+
+ clock-output-names:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - clock-output-names
+ - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ clock@3b7001c0 {
+ compatible = "apple,t8103-gate-clock";
+ reg = <0x3b7001c0 0x4>;
+ #clock-cells = <0>;
+ clock-output-names = "sio_busif_clk";
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 008fcad7ac00..59c026ce4d73 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1654,6 +1654,7 @@ B: https://github.com/AsahiLinux/linux/issues
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/clock/apple,gate-clock.yaml
F: Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
F: arch/arm64/boot/dts/apple/
F: drivers/irqchip/irq-apple-aic.c
--
2.25.1