linux-kernel - [PATCH v2 1/6] dt-bindings: clock: imx8m-anatop: support spread spectrum clocking

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Message-ID: <20240929172743.1758292-2-dario.binacchi@amarulasolutions.com>
Date: Sun, 29 Sep 2024 19:27:11 +0200
From: Dario Binacchi <dario.binacchi@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
	Dario Binacchi <dario.binacchi@...rulasolutions.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabio Estevam <festevam@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Peng Fan <peng.fan@....com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Stephen Boyd <sboyd@...nel.org>,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: [PATCH v2 1/6] dt-bindings: clock: imx8m-anatop: support spread spectrum clocking

The patch adds the DT bindings for enabling and tuning spread spectrum
clocking generation.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

---

Changes in v2:
- Add "allOf:" and place it after "required:" block, like in the
  example schema.
- Move the properties definition to the top-level.
- Drop unit types as requested by the "make dt_binding_check" command.

 .../bindings/clock/fsl,imx8m-anatop.yaml      | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml b/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
index bbd22e95b319..a142c04fef00 100644
--- a/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
+++ b/Documentation/devicetree/bindings/clock/fsl,imx8m-anatop.yaml
@@ -33,11 +33,56 @@ properties:
   '#clock-cells':
     const: 1
 
+  fsl,ssc-clocks:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      List of phandle and clock specifier pairs of PLLs with spread
+      spectrum generation hardware capability.
+    maxItems: 4
+
+  fsl,ssc-modfreq-hz:
+    description:
+      The values of modulation frequency (Hz unit) of spread spectrum
+      clocking for each PLL.
+    maxItems: 4
+
+  fsl,ssc-modrate-percent:
+    description:
+      The percentage values of modulation rate of spread spectrum
+      clocking for each PLL.
+    maxItems: 4
+
+  fsl,ssc-modmethod:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description:
+      The modulation techniques of spread spectrum clocking for
+      each PLL.
+    oneOf:
+      - enum:
+          - down-spread
+          - up-spread
+          - center-spread
+    maxItems: 4
+
 required:
   - compatible
   - reg
   - '#clock-cells'
 
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: fsl,imx8mm-anatop
+    then:
+      properties:
+        fsl,ssc-clocks: false
+        fsl,ssc-modfreq-hz: false
+        fsl,ssc-modrate-percent: false
+        fsl,ssc-modmethod: false
+
 additionalProperties: false
 
 examples:
-- 
2.43.0