Thread (28 messages) 28 messages, 5 authors, 2026-04-15

Re: [PATCH 03/13] dt-bindings: clock: Add Amlogic A9 misc clock control units

From: Krzysztof Kozlowski <krzk@kernel.org>
Date: 2026-02-09 13:15:57
Also in: linux-amlogic, linux-clk, lkml

On 09/02/2026 06:48, Chuan Liu via B4 Relay wrote:
+
+  '#clock-cells':
+    description:
+      The clock controller of a module may contain one or more child clock(s).
+      When a clock controller has multiple child clocks, an index is required
+      to specify a particular clock within the clock controller.
+    oneOf:
+      - const: 0
+        description: Single clock output, no specifier needed
+      - const: 1
+        description: Multiple clocks, index selects specific output
+
+  amlogic,clock-max-frequency:
No
+    description: |
+      Each clock's maximum output frequency is constrained during hardware
+      design to ensure proper timing requirements for the clock network. If the
+      clock frequency configured exceeds this design limit, it can lead to
+      abnormal behavior in modules relying on that clock and may even cause
+      cross-talk that affects other modules.
+
+      In the driver, this property is parsed, and interface functions from the
+      CCF are called to enforce the clock's maximum frequency, preventing
+      potential issues caused by excessive clock frequency configurations.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+
+  amlogic,clock-init-regs:
NAK

...
quoted hunk ↗ jump to hunk
diff --git a/include/dt-bindings/clock/amlogic,a9-misc-ccu.h b/include/dt-bindings/clock/amlogic,a9-misc-ccu.h
new file mode 100644
index 000000000000..102aff8d68e4
--- /dev/null
+++ b/include/dt-bindings/clock/amlogic,a9-misc-ccu.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
Use the same license as in binding doc.



Best regards,
Krzysztof
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