linux-kernel - [LINUX PATCH v2 2/3] dt-bindings: timer: Add bindings for TTC PWM

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Date:   Tue, 14 Nov 2023 18:17:47 +0530
From:   Mubin Sayyed <mubin.sayyed@....com>
To:     <krzysztof.kozlowski+dt@...aro.org>,
        <u.kleine-koenig@...gutronix.de>, <thierry.reding@...il.com>,
        <robh+dt@...nel.org>, <conor+dt@...nel.org>, <tglx@...utronix.de>,
        <daniel.lezcano@...aro.org>, <michal.simek@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-pwm@...r.kernel.org>, <git@....com>, <mubin10@...il.com>,
        Mubin Sayyed <mubin.sayyed@....com>
Subject: [LINUX PATCH v2 2/3] dt-bindings: timer: Add bindings for TTC PWM

Cadence TTC can act as PWM device, it is 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>
---
Changes for v2:
  Update subject
  Modify #pwm-cells to constant 3
  Update example to use generic name
---
 .../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