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

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Date:   Mon, 24 May 2021 20:27:43 +0200
From:   Sven Peter <sven@...npeter.dev>
To:     devicetree@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     Sven Peter <sven@...npeter.dev>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hector Martin <marcan@...can.st>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Arnd Bergmann <arnd@...nel.org>
Subject: [PATCH 1/3] dt-bindings: clock: add DT bindings for apple,gate-clock

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@...npeter.dev>
---
 .../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@...npeter.dev>
+
+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@...001c0 {
+      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