[v4] Introduce STM32 DDR PMU for STM32MP platforms

[PATCH v4 02/20] dt-bindings: stm32: stm32mp25: add `access-controller-cell` property

Posted by Clément Le Goffic 2 months, 2 weeks ago

RCC is able to check the availability of a clock.
Allow to query the RCC with a firewall ID.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
---
 Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
index 88e52f10d1ec..4d471e3d89bc 100644
--- a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
+++ b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
@@ -31,6 +31,11 @@ properties:
   '#reset-cells':
     const: 1
 
+  '#access-controller-cells':
+    const: 1
+    description:
+      Contains the firewall ID associated to the peripheral.
+
   clocks:
     items:
       - description: CK_SCMI_HSE High Speed External oscillator (8 to 48 MHz)
@@ -123,6 +128,7 @@ required:
   - reg
   - '#clock-cells'
   - '#reset-cells'
+  - '#access-controller-cells'
   - clocks
 
 additionalProperties: false
@@ -136,6 +142,7 @@ examples:
         reg = <0x44200000 0x10000>;
         #clock-cells = <1>;
         #reset-cells = <1>;
+        #access-controller-cells = <1>;
         clocks =  <&scmi_clk CK_SCMI_HSE>,
                   <&scmi_clk CK_SCMI_HSI>,
                   <&scmi_clk CK_SCMI_MSI>,

-- 
2.43.0

Re: [PATCH v4 02/20] dt-bindings: stm32: stm32mp25: add `access-controller-cell` property

Posted by Rob Herring 2 months, 2 weeks ago

On Wed, Jul 23, 2025 at 03:05:46PM +0200, Clément Le Goffic wrote:
> RCC is able to check the availability of a clock.
> Allow to query the RCC with a firewall ID.

The subject is wrong. There is no such "access-controller-cell" 
property.
> 
> Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
> ---
>  Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> index 88e52f10d1ec..4d471e3d89bc 100644
> --- a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> +++ b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> @@ -31,6 +31,11 @@ properties:
>    '#reset-cells':
>      const: 1
>  
> +  '#access-controller-cells':
> +    const: 1
> +    description:
> +      Contains the firewall ID associated to the peripheral.
> +
>    clocks:
>      items:
>        - description: CK_SCMI_HSE High Speed External oscillator (8 to 48 MHz)
> @@ -123,6 +128,7 @@ required:
>    - reg
>    - '#clock-cells'
>    - '#reset-cells'
> +  - '#access-controller-cells'
>    - clocks
>  
>  additionalProperties: false
> @@ -136,6 +142,7 @@ examples:
>          reg = <0x44200000 0x10000>;
>          #clock-cells = <1>;
>          #reset-cells = <1>;
> +        #access-controller-cells = <1>;
>          clocks =  <&scmi_clk CK_SCMI_HSE>,
>                    <&scmi_clk CK_SCMI_HSI>,
>                    <&scmi_clk CK_SCMI_MSI>,
> 
> -- 
> 2.43.0
>

Re: [PATCH v4 02/20] dt-bindings: stm32: stm32mp25: add `access-controller-cell` property

Posted by Clement LE GOFFIC 2 months, 2 weeks ago

Hi Rob,

On 7/23/25 15:41, Rob Herring wrote:
> On Wed, Jul 23, 2025 at 03:05:46PM +0200, Clément Le Goffic wrote:
>> RCC is able to check the availability of a clock.
>> Allow to query the RCC with a firewall ID.
> 
> The subject is wrong. There is no such "access-controller-cell"
> property.

I found it here though:
Documentation/devicetree/bindings/access-controllers/access-controllers.yaml

And want to use it like here:
Documentation/devicetree/bindings/bus/st,stm32-etzpc.yaml:41

Oh I see I might need to add the #.

Best regards,
Clément