[PATCH 0/3] ARM: stm32: add DT properties for remote proc synchronisation

[PATCH 0/3] ARM: stm32: add DT properties for remote proc synchronisation

[Arnaud Pouliquen]

This series implements the DT part associated to the commit 9276536f455b3
("remoteproc: stm32: Parse syscon that will manage M4 synchronisation")

Arnaud Pouliquen (3):
  dt-bindings: arm: stm32: Add compatible for syscon tamp node
  dt-bindings: remoteproc: stm32_rproc: update for firmware
    synchronization
  ARM: dts: stm32: update stm32mp151 for remote proc synchronization
    support

 .../bindings/arm/stm32/st,stm32-syscon.yaml   |  1 +
 .../bindings/remoteproc/st,stm32-rproc.yaml   | 19 +++++++++++++++++++
 arch/arm/boot/dts/stm32mp151.dtsi             |  7 +++++++
 3 files changed, 27 insertions(+)

-- 
2.17.1


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[PATCH 1/3] dt-bindings: arm: stm32: Add compatible for syscon tamp node

[Arnaud Pouliquen]

Since commit ad440432d1f9 ("dt-bindings: mfd: Ensure 'syscon' has a
more specific compatible")
It is required to provide at least 2 compatibles string for syscon node.
This patch documents the new compatible for stm32 SoC to support
TAMP registers access.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
index 6f1cd0103c74..6634b3e0853e 100644
--- a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
+++ b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
@@ -19,6 +19,7 @@ properties:
               - st,stm32mp151-pwr-mcu
               - st,stm32-syscfg
               - st,stm32-power-config
+              - st,stm32-tamp
           - const: syscon
 
   reg:
-- 
2.17.1


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[PATCH 2/3] dt-bindings: remoteproc: stm32_rproc: update for firmware synchronization

[Arnaud Pouliquen]

Add new properties description used to attach to a pre-loaded
firmware according to the commit 9276536f455b3
("remoteproc: stm32: Parse syscon that will manage M4 synchronisation")
which updates the driver part.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 .../bindings/remoteproc/st,stm32-rproc.yaml   | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
index 4ffa25268fcc..e50957d86b1c 100644
--- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
@@ -96,6 +96,25 @@ properties:
         3rd cell: register bitmask for the deep sleep bit
     maxItems: 1
 
+  st,syscfg-m4-state:
+    $ref: "/schemas/types.yaml#/definitions/phandle-array"
+    description: |
+      Reference to the tamp register which exposes the Cortex-M4 state.
+        1st cell: phandle to syscon block
+        2nd cell: register offset containing the Cortex-M4 state
+        3rd cell: register bitmask for the Cortex-M4 state
+    maxItems: 1
+
+  st,syscfg-rsc-tbl:
+    $ref: "/schemas/types.yaml#/definitions/phandle-array"
+    description: |
+      Reference to the tamp register which references the Cortex-M4
+      resource table address.
+        1st cell: phandle to syscon block
+        2nd cell: register offset containing the resource table address
+        3rd cell: register bitmask for the resource table address
+    maxItems: 1
+
   st,auto-boot:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-- 
2.17.1


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[PATCH 3/3] ARM: dts: stm32: update stm32mp151 for remote proc synchronisation support

[Arnaud Pouliquen]

Two backup registers are used to store the Cortex-M4 state and the resource
table address.
Declare the tamp node and add associated properties in m4_rproc node
to allow Linux to attach to a firmware loaded by the first boot stages.

Associated driver implementation is available in commit 9276536f455b3
("remoteproc: stm32: Parse syscon that will manage M4 synchronisation").

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index bfe29023fbd5..842ecffae73a 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1541,6 +1541,11 @@
 			status = "disabled";
 		};
 
+		tamp: tamp@5c00a000 {
+			compatible = "st,stm32-tamp", "syscon";
+			reg = <0x5c00a000 0x400>;
+		};
+
 		/*
 		 * Break node order to solve dependency probe issue between
 		 * pinctrl and exti.
@@ -1717,6 +1722,8 @@
 			st,syscfg-holdboot = <&rcc 0x10C 0x1>;
 			st,syscfg-tz = <&rcc 0x000 0x1>;
 			st,syscfg-pdds = <&pwr_mcu 0x0 0x1>;
+			st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
+			st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
 			status = "disabled";
 		};
 	};
-- 
2.17.1


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Re: [PATCH 1/3] dt-bindings: arm: stm32: Add compatible for syscon tamp node

[Rob Herring]

On Thu, 27 Aug 2020 09:20:59 +0200, Arnaud Pouliquen wrote:
> Since commit ad440432d1f9 ("dt-bindings: mfd: Ensure 'syscon' has a
> more specific compatible")
> It is required to provide at least 2 compatibles string for syscon node.
> This patch documents the new compatible for stm32 SoC to support
> TAMP registers access.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
> ---
>  Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

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Re: [PATCH 2/3] dt-bindings: remoteproc: stm32_rproc: update for firmware synchronization

[Rob Herring]

On Thu, Aug 27, 2020 at 09:21:00AM +0200, Arnaud Pouliquen wrote:
> Add new properties description used to attach to a pre-loaded
> firmware according to the commit 9276536f455b3
> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation")
> which updates the driver part.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
> ---
>  .../bindings/remoteproc/st,stm32-rproc.yaml   | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
> index 4ffa25268fcc..e50957d86b1c 100644
> --- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
> +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
> @@ -96,6 +96,25 @@ properties:
>          3rd cell: register bitmask for the deep sleep bit
>      maxItems: 1
>  
> +  st,syscfg-m4-state:
> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
> +    description: |
> +      Reference to the tamp register which exposes the Cortex-M4 state.
> +        1st cell: phandle to syscon block
> +        2nd cell: register offset containing the Cortex-M4 state
> +        3rd cell: register bitmask for the Cortex-M4 state
> +    maxItems: 1
> +
> +  st,syscfg-rsc-tbl:
> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
> +    description: |
> +      Reference to the tamp register which references the Cortex-M4
> +      resource table address.
> +        1st cell: phandle to syscon block
> +        2nd cell: register offset containing the resource table address
> +        3rd cell: register bitmask for the resource table address
> +    maxItems: 1

Why can't these be implied? You can lookup the tamp syscon by 
compatible.

Please add these to the example.

> +
>    st,auto-boot:
>      $ref: /schemas/types.yaml#/definitions/flag
>      description:
> -- 
> 2.17.1
> 

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Re: [PATCH 2/3] dt-bindings: remoteproc: stm32_rproc: update for firmware synchronization

[Arnaud POULIQUEN]

Hi Rob,

On 9/9/20 10:22 PM, Rob Herring wrote:
> On Thu, Aug 27, 2020 at 09:21:00AM +0200, Arnaud Pouliquen wrote:
>> Add new properties description used to attach to a pre-loaded
>> firmware according to the commit 9276536f455b3
>> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation")
>> which updates the driver part.
>>
>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
>> ---
>>  .../bindings/remoteproc/st,stm32-rproc.yaml   | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> index 4ffa25268fcc..e50957d86b1c 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> @@ -96,6 +96,25 @@ properties:
>>          3rd cell: register bitmask for the deep sleep bit
>>      maxItems: 1
>>  
>> +  st,syscfg-m4-state:
>> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
>> +    description: |
>> +      Reference to the tamp register which exposes the Cortex-M4 state.
>> +        1st cell: phandle to syscon block
>> +        2nd cell: register offset containing the Cortex-M4 state
>> +        3rd cell: register bitmask for the Cortex-M4 state
>> +    maxItems: 1
>> +
>> +  st,syscfg-rsc-tbl:
>> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
>> +    description: |
>> +      Reference to the tamp register which references the Cortex-M4
>> +      resource table address.
>> +        1st cell: phandle to syscon block
>> +        2nd cell: register offset containing the resource table address
>> +        3rd cell: register bitmask for the resource table address
>> +    maxItems: 1
> 
> Why can't these be implied? You can lookup the tamp syscon by 
> compatible.

I just made a copy/past of the  "st,syscfg-pdds" syscon description available in the same file [1]
  
I can provide a shorter descriptions, something like this:

   description: |
     Reference to the tamp syscon register and bitmask which contains the Cortex-M4
      resource table address.
   maxItems: 1

Would this meet your expectations? If yes, I will also add in next version an extra patch to fix [1]

[1] https://elixir.bootlin.com/linux/v5.9-rc3/source/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml#L90

> 
> Please add these to the example.

I will extend the example with these properties

Thanks,
Arnaud

> 
>> +
>>    st,auto-boot:
>>      $ref: /schemas/types.yaml#/definitions/flag
>>      description:
>> -- 
>> 2.17.1
>>

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Re: [PATCH 2/3] dt-bindings: remoteproc: stm32_rproc: update for firmware synchronization

[Arnaud POULIQUEN]

Hi Rob,

Gentle reminder.
As I'm not sure to well understand your comment I would appreciate if you could
confirm your expectation before I sent a v2.

Thanks in advance,
Arnaud 

On 9/11/20 3:49 PM, Arnaud POULIQUEN wrote:
> Hi Rob,
> 
> On 9/9/20 10:22 PM, Rob Herring wrote:
>> On Thu, Aug 27, 2020 at 09:21:00AM +0200, Arnaud Pouliquen wrote:
>>> Add new properties description used to attach to a pre-loaded
>>> firmware according to the commit 9276536f455b3
>>> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation")
>>> which updates the driver part.
>>>
>>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
>>> ---
>>>  .../bindings/remoteproc/st,stm32-rproc.yaml   | 19 +++++++++++++++++++
>>>  1 file changed, 19 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>>> index 4ffa25268fcc..e50957d86b1c 100644
>>> --- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>>> +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>>> @@ -96,6 +96,25 @@ properties:
>>>          3rd cell: register bitmask for the deep sleep bit
>>>      maxItems: 1
>>>  
>>> +  st,syscfg-m4-state:
>>> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
>>> +    description: |
>>> +      Reference to the tamp register which exposes the Cortex-M4 state.
>>> +        1st cell: phandle to syscon block
>>> +        2nd cell: register offset containing the Cortex-M4 state
>>> +        3rd cell: register bitmask for the Cortex-M4 state
>>> +    maxItems: 1
>>> +
>>> +  st,syscfg-rsc-tbl:
>>> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"
>>> +    description: |
>>> +      Reference to the tamp register which references the Cortex-M4
>>> +      resource table address.
>>> +        1st cell: phandle to syscon block
>>> +        2nd cell: register offset containing the resource table address
>>> +        3rd cell: register bitmask for the resource table address
>>> +    maxItems: 1
>>
>> Why can't these be implied? You can lookup the tamp syscon by 
>> compatible.
> 
> I just made a copy/past of the  "st,syscfg-pdds" syscon description available in the same file [1]
>   
> I can provide a shorter descriptions, something like this:
> 
>    description: |
>      Reference to the tamp syscon register and bitmask which contains the Cortex-M4
>       resource table address.
>    maxItems: 1
> 
> Would this meet your expectations? If yes, I will also add in next version an extra patch to fix [1]
> 
> [1] https://elixir.bootlin.com/linux/v5.9-rc3/source/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml#L90
> 
>>
>> Please add these to the example.
> 
> I will extend the example with these properties
> 
> Thanks,
> Arnaud
> 
>>
>>> +
>>>    st,auto-boot:
>>>      $ref: /schemas/types.yaml#/definitions/flag
>>>      description:
>>> -- 
>>> 2.17.1
>>>

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Re: [Linux-stm32] [PATCH 3/3] ARM: dts: stm32: update stm32mp151 for remote proc synchronisation support

[Ahmad Fatoum]

Hello Arnaud,

On 8/27/20 9:21 AM, Arnaud Pouliquen wrote:
> Two backup registers are used to store the Cortex-M4 state and the resource
> table address.
> Declare the tamp node and add associated properties in m4_rproc node
> to allow Linux to attach to a firmware loaded by the first boot stages.
> 
> Associated driver implementation is available in commit 9276536f455b3
> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation").
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
> ---
>  arch/arm/boot/dts/stm32mp151.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
> index bfe29023fbd5..842ecffae73a 100644
> --- a/arch/arm/boot/dts/stm32mp151.dtsi
> +++ b/arch/arm/boot/dts/stm32mp151.dtsi
> @@ -1541,6 +1541,11 @@
>  			status = "disabled";
>  		};
>  
> +		tamp: tamp@5c00a000 {
> +			compatible = "st,stm32-tamp", "syscon";
> +			reg = <0x5c00a000 0x400>;
> +		};
> +

Just saw this now. I have a pending patch adding this node as well:
https://lore.kernel.org/patchwork/patch/1306971/

For my use case, I need a "simple-mfd" compatible to allow child
nodes to be probed.

Could you CC me when you send out your v2, so I can rebase?
(Or if you don't mind, just add the "simple-mfd" into the compatible
list yourself :-)

Cheers
Ahmad

>  		/*
>  		 * Break node order to solve dependency probe issue between
>  		 * pinctrl and exti.
> @@ -1717,6 +1722,8 @@
>  			st,syscfg-holdboot = <&rcc 0x10C 0x1>;
>  			st,syscfg-tz = <&rcc 0x000 0x1>;
>  			st,syscfg-pdds = <&pwr_mcu 0x0 0x1>;
> +			st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
> +			st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
>  			status = "disabled";
>  		};
>  	};
> 

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Re: [Linux-stm32] [PATCH 3/3] ARM: dts: stm32: update stm32mp151 for remote proc synchronisation support

[Arnaud POULIQUEN]

Hi Ahmad,

On 9/24/20 7:45 AM, Ahmad Fatoum wrote:
> Hello Arnaud,
> 
> On 8/27/20 9:21 AM, Arnaud Pouliquen wrote:
>> Two backup registers are used to store the Cortex-M4 state and the resource
>> table address.
>> Declare the tamp node and add associated properties in m4_rproc node
>> to allow Linux to attach to a firmware loaded by the first boot stages.
>>
>> Associated driver implementation is available in commit 9276536f455b3
>> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation").
>>
>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
>> ---
>>  arch/arm/boot/dts/stm32mp151.dtsi | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
>> index bfe29023fbd5..842ecffae73a 100644
>> --- a/arch/arm/boot/dts/stm32mp151.dtsi
>> +++ b/arch/arm/boot/dts/stm32mp151.dtsi
>> @@ -1541,6 +1541,11 @@
>>  			status = "disabled";
>>  		};
>>  
>> +		tamp: tamp@5c00a000 {
>> +			compatible = "st,stm32-tamp", "syscon";
>> +			reg = <0x5c00a000 0x400>;
>> +		};
>> +
> 
> Just saw this now. I have a pending patch adding this node as well:
> https://lore.kernel.org/patchwork/patch/1306971/
> 
> For my use case, I need a "simple-mfd" compatible to allow child
> nodes to be probed.
> 
> Could you CC me when you send out your v2, so I can rebase?
> (Or if you don't mind, just add the "simple-mfd" into the compatible
> list yourself :-)

I prefer that you propose the "simple-mfd" compatibility. I do not master the
consequence of adding it...
I will add you in cc of my v2 , but as your patch could trig some discussions
I would suggest to send in advance a patchset including this patch and your patch
on top of, just add a reference to this series in the cover letter and explain
potential impact (or non impact) on the legacy.

Regards,
Arnaud
 
> 
> Cheers
> Ahmad
> 
>>  		/*
>>  		 * Break node order to solve dependency probe issue between
>>  		 * pinctrl and exti.
>> @@ -1717,6 +1722,8 @@
>>  			st,syscfg-holdboot = <&rcc 0x10C 0x1>;
>>  			st,syscfg-tz = <&rcc 0x000 0x1>;
>>  			st,syscfg-pdds = <&pwr_mcu 0x0 0x1>;
>> +			st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
>> +			st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
>>  			status = "disabled";
>>  		};
>>  	};
>>
> 

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