linux-kernel - [LINUX PATCH 2/3] dt-bindings: timer: Update device tree bindings for cadence TTC PWM

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Message-ID: <20230112071526.3035949-3-mubin.sayyed@amd.com>
Date:   Thu, 12 Jan 2023 12:45:25 +0530
From:   Mubin Sayyed <mubin.sayyed@....com>
To:     <robh+dt@...nel.org>, <treding@...dia.com>,
        <u.kleine-koenig@...gutronix.de>, <linux-pwm@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>, <git@....com>,
        <michal.simek@....com>, <siva.durga.prasad.paladugu@....com>,
        <mubin10@...il.com>, Mubin Sayyed <mubin.sayyed@....com>
Subject: [LINUX PATCH 2/3] dt-bindings: timer: Update device tree bindings for cadence 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.
Updated bindings to support TTC PWM configuration.

Signed-off-by: Mubin Sayyed <mubin.sayyed@....com>
---
 .../devicetree/bindings/timer/cdns,ttc.yaml   | 25 ++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/timer/cdns,ttc.yaml b/Documentation/devicetree/bindings/timer/cdns,ttc.yaml
index 7d821fd480f6..2855e92e02e3 100644
--- a/Documentation/devicetree/bindings/timer/cdns,ttc.yaml
+++ b/Documentation/devicetree/bindings/timer/cdns,ttc.yaml
@@ -32,12 +32,26 @@ properties:
     description: |
       Bit width of the timer, necessary if not 16.
 
+  "#pwm-cells":
+    description: |
+      Required to configure TTC as PWM device, supported cells are 0 to 3.
+    minimum: 0
+    maximum: 3
+
 required:
   - compatible
   - reg
-  - interrupts
   - clocks
 
+allOf:
+  - if:
+      not:
+        required:
+          - "#pwm-cells"
+    then:
+      required:
+        - interrupts
+
 additionalProperties: false
 
 examples:
@@ -50,3 +64,12 @@ examples:
         clocks = <&cpu_clk 3>;
         timer-width = <32>;
     };
+
+  - |
+    ttc1: ttc1@...02000 {
+        compatible = "cdns,ttc";
+        reg = <0xF8002000 0x1000>;
+        clocks = <&cpu_clk 3>;
+        timer-width = <32>;
+        #pwm-cells = <3>;
+    };
-- 
2.25.1