linux-kernel - [PATCH v3] dt-bindings: timer: Add support for cadence TTC PWM

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Message-ID: <20240226093333.2581092-1-mubin.sayyed@amd.com>
Date: Mon, 26 Feb 2024 15:03:33 +0530
From: Mubin Sayyed <mubin.sayyed@....com>
To: <krzysztof.kozlowski+dt@...aro.org>, <robh+dt@...nel.org>,
	<conor+dt@...nel.org>, <devicetree@...r.kernel.org>
CC: <daniel.lezcano@...aro.org>, <tglx@...utronix.de>, <michal.simek@....com>,
	<linux-kernel@...r.kernel.org>, Mubin Sayyed <mubin.sayyed@....com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v3] dt-bindings: timer: Add support for cadence TTC PWM

Cadence TTC can act as PWM device, it will be supported through
separate PWM framework based driver. Decision to configure
specific TTC device as PWM or clocksource/clockevent would
be done based on presence of "#pwm-cells" property.

Also, interrupt property is not required for TTC PWM driver.
Update bindings to support TTC PWM configuration.

Signed-off-by: Mubin Sayyed <mubin.sayyed@....com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
Changes for v3:
  Add Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
  tag
  Remove bindings from subject
  1/3 and 3/3 are dropped as of now (WIP).

Changes for v2:
  Update subject
  Modify #pwm-cells to constant 3
  Update example to use generic name

link for v2:
  https://lore.kernel.org/linux-arm-kernel/20231114124748.581850-2-mubin.sayyed@amd.com/T/
---
 .../devicetree/bindings/timer/cdns,ttc.yaml   | 22 ++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/timer/cdns,ttc.yaml b/Documentation/devicetree/bindings/timer/cdns,ttc.yaml
index dbba780c9b02..da342464d32e 100644
--- a/Documentation/devicetree/bindings/timer/cdns,ttc.yaml
+++ b/Documentation/devicetree/bindings/timer/cdns,ttc.yaml
@@ -32,12 +32,23 @@ properties:
     description: |
       Bit width of the timer, necessary if not 16.
 
+  "#pwm-cells":
+    const: 3
+
 required:
   - compatible
   - reg
-  - interrupts
   - clocks
 
+allOf:
+  - if:
+      not:
+        required:
+          - "#pwm-cells"
+    then:
+      required:
+        - interrupts
+
 additionalProperties: false
 
 examples:
@@ -50,3 +61,12 @@ examples:
         clocks = <&cpu_clk 3>;
         timer-width = <32>;
     };
+
+  - |
+    pwm: pwm@...02000 {
+        compatible = "cdns,ttc";
+        reg = <0xf8002000 0x1000>;
+        clocks = <&cpu_clk 3>;
+        timer-width = <32>;
+        #pwm-cells = <3>;
+    };
-- 
2.25.1