[PATCH v2] dt-bindings: pwm: st,pwm: convert to DT schema

[PATCH v2] dt-bindings: pwm: st,pwm: convert to DT schema

[Charan Pedumuru]

Convert STMicroelectronics STiH41x PWM/Capture controller binding
to DT schema.
Changes during conversion:
- Add 'interrupts' to the required list. The text binding listed it
  as required and the driver unconditionally calls platform_get_irq().
- Drop pinctrl-0 from the required list as pinctrl properties are
  inherited and validated by the pinctrl schema.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
---
Changes in v2:
- Add the missing interrupts to the required following the old binding.
- Modify commit message to explain the changes made.
- Link to v1: https://patch.msgid.link/20260613-st-pwm-v1-1-458c2c89709a@gmail.com
---
 Documentation/devicetree/bindings/pwm/pwm-st.txt  | 43 -----------
 Documentation/devicetree/bindings/pwm/st,pwm.yaml | 93 +++++++++++++++++++++++
 2 files changed, 93 insertions(+), 43 deletions(-)

diff --git a/Documentation/devicetree/bindings/pwm/pwm-st.txt b/Documentation/devicetree/bindings/pwm/pwm-st.txt
deleted file mode 100644
index 19fce774cafa..000000000000
--- a/Documentation/devicetree/bindings/pwm/pwm-st.txt
+++ /dev/null
@@ -1,43 +0,0 @@
-STMicroelectronics PWM driver bindings
---------------------------------------
-
-Required parameters:
-- compatible :		"st,pwm"
-- #pwm-cells : 		Number of cells used to specify a PWM. First cell
-			specifies the per-chip index of the PWM to use and the
-			second cell is the period in nanoseconds - fixed to 2
-			for STiH41x.
-- reg :			Physical base address and length of the controller's
-			registers.
-- pinctrl-names: 	Set to "default".
-- pinctrl-0: 		List of phandles pointing to pin configuration nodes
-			for PWM module.
-			For Pinctrl properties, please refer to [1].
-- clock-names: 		Valid entries are "pwm" and/or "capture".
-- clocks: 		phandle of the clock used by the PWM module.
-			For Clk properties, please refer to [2].
-- interrupts:		IRQ for the Capture device
-
-Optional properties:
-- st,pwm-num-chan:	Number of available PWM channels.  Default is 0.
-- st,capture-num-chan:	Number of available Capture channels.  Default is 0.
-
-[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Example:
-
-pwm1: pwm@fe510000 {
-	compatible = "st,pwm";
-	reg = <0xfe510000 0x68>;
-	#pwm-cells = <2>;
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_pwm1_chan0_default
-		     &pinctrl_pwm1_chan1_default
-		     &pinctrl_pwm1_chan2_default
-		     &pinctrl_pwm1_chan3_default>;
-	clocks = <&clk_sysin>;
-	clock-names = "pwm";
-	st,pwm-num-chan = <4>;
-	st,capture-num-chan = <2>;
-};
diff --git a/Documentation/devicetree/bindings/pwm/st,pwm.yaml b/Documentation/devicetree/bindings/pwm/st,pwm.yaml
new file mode 100644
index 000000000000..a045502e0e70
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/st,pwm.yaml
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/st,pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STiH41x PWM/Capture controller
+
+maintainers:
+  - Ajit Pal Singh <ajitpal.singh@st.com>
+
+description:
+  The STiH41x PWM controller supports both PWM output and input capture
+  functionality. It provides multiple PWM output channels for generating
+  variable duty-cycle waveforms, and multiple input capture channels for
+  measuring external signal periods and pulse widths. PWM output channels
+  and input capture channels are configured independently via
+  st,pwm-num-chan and st,capture-num-chan respectively.
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    const: st,pwm
+
+  reg:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 2
+
+  pinctrl-names:
+    const: default
+
+  clock-names:
+    items:
+      enum: [pwm, capture]
+    minItems: 1
+    maxItems: 2
+
+  clocks:
+    minItems: 1
+    maxItems: 2
+
+  interrupts:
+    description: IRQ line for the capture device.
+    maxItems: 1
+
+  st,pwm-num-chan:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Number of available PWM output channels.
+    minimum: 0
+    maximum: 4
+    default: 0
+
+  st,capture-num-chan:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Number of available input capture channels.
+    minimum: 0
+    maximum: 4
+    default: 0
+
+required:
+  - reg
+  - compatible
+  - "#pwm-cells"
+  - pinctrl-names
+  - clock-names
+  - clocks
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    pwm@fe510000 {
+        compatible = "st,pwm";
+        reg = <0xfe510000 0x68>;
+        interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>;
+        #pwm-cells = <2>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_pwm1_chan0_default
+                     &pinctrl_pwm1_chan1_default
+                     &pinctrl_pwm1_chan2_default
+                     &pinctrl_pwm1_chan3_default>;
+        clocks = <&clk_sysin>;
+        clock-names = "pwm";
+        st,pwm-num-chan = <4>;
+        st,capture-num-chan = <2>;
+    };
+...

---
base-commit: c425609d6ac4012c8bbf01ec2e10e801b1923a7b
change-id: 20260613-st-pwm-1feade6cfea3

Best regards,
--  
Charan Pedumuru <charan.pedumuru@gmail.com>

Re: [PATCH v2] dt-bindings: pwm: st,pwm: convert to DT schema

[Krzysztof Kozlowski]

On Thu, Jun 18, 2026 at 12:42:07PM +0000, Charan Pedumuru wrote:
> +description:
> +  The STiH41x PWM controller supports both PWM output and input capture
> +  functionality. It provides multiple PWM output channels for generating
> +  variable duty-cycle waveforms, and multiple input capture channels for
> +  measuring external signal periods and pulse widths. PWM output channels
> +  and input capture channels are configured independently via
> +  st,pwm-num-chan and st,capture-num-chan respectively.
> +
> +allOf:
> +  - $ref: pwm.yaml#

Where is this compatible used?

Best regards,
Krzysztof

Re: [PATCH v2] dt-bindings: pwm: st,pwm: convert to DT schema

[Charan Pedumuru]

On 23-06-2026 12:47, Krzysztof Kozlowski wrote:
> On Thu, Jun 18, 2026 at 12:42:07PM +0000, Charan Pedumuru wrote:
>> +description:
>> +  The STiH41x PWM controller supports both PWM output and input capture
>> +  functionality. It provides multiple PWM output channels for generating
>> +  variable duty-cycle waveforms, and multiple input capture channels for
>> +  measuring external signal periods and pulse widths. PWM output channels
>> +  and input capture channels are configured independently via
>> +  st,pwm-num-chan and st,capture-num-chan respectively.
>> +
>> +allOf:
>> +  - $ref: pwm.yaml#
> 
> Where is this compatible used?

I will remove this allof and redefine the YAML again

> 
> Best regards,
> Krzysztof
> 

-- 
Best Regards,
Charan.

Re: [PATCH v2] dt-bindings: pwm: st,pwm: convert to DT schema

[Krzysztof Kozlowski]

On 23/06/2026 16:16, Charan Pedumuru wrote:
> 
> 
> On 23-06-2026 12:47, Krzysztof Kozlowski wrote:
>> On Thu, Jun 18, 2026 at 12:42:07PM +0000, Charan Pedumuru wrote:
>>> +description:
>>> +  The STiH41x PWM controller supports both PWM output and input capture
>>> +  functionality. It provides multiple PWM output channels for generating
>>> +  variable duty-cycle waveforms, and multiple input capture channels for
>>> +  measuring external signal periods and pulse widths. PWM output channels
>>> +  and input capture channels are configured independently via
>>> +  st,pwm-num-chan and st,capture-num-chan respectively.
>>> +
>>> +allOf:
>>> +  - $ref: pwm.yaml#
>>
>> Where is this compatible used?
> 
> I will remove this allof and redefine the YAML again
>


Sorry, I think I messed something so comment was incorrectly placed.

The comment should be under:

"+    const: st,pwm"

Best regards,
Krzysztof

Re: [PATCH v2] dt-bindings: pwm: st,pwm: convert to DT schema

[Charan Pedumuru]

On 23-06-2026 19:55, Krzysztof Kozlowski wrote:
> On 23/06/2026 16:16, Charan Pedumuru wrote:
>>
>>
>> On 23-06-2026 12:47, Krzysztof Kozlowski wrote:
>>> On Thu, Jun 18, 2026 at 12:42:07PM +0000, Charan Pedumuru wrote:
>>>> +description:
>>>> +  The STiH41x PWM controller supports both PWM output and input capture
>>>> +  functionality. It provides multiple PWM output channels for generating
>>>> +  variable duty-cycle waveforms, and multiple input capture channels for
>>>> +  measuring external signal periods and pulse widths. PWM output channels
>>>> +  and input capture channels are configured independently via
>>>> +  st,pwm-num-chan and st,capture-num-chan respectively.
>>>> +
>>>> +allOf:
>>>> +  - $ref: pwm.yaml#
>>>
>>> Where is this compatible used?
>>
>> I will remove this allof and redefine the YAML again
>>
> 
> 
> Sorry, I think I messed something so comment was incorrectly placed.
> 
> The comment should be under:
> 
> "+    const: st,pwm"

Okay, this compatible is not used and there is a similar compatible "st,sti-pwm", AI bot detected it and I will rename it and modify the commit message with necessary explanation. Also the maintainer email doesn't exist now. I will change that too with other maintainer. Thank you.

> 
> Best regards,
> Krzysztof

-- 
Best Regards,
Charan.