diff mbox series

[2/4] dt-bindings: remoteproc: add compatibility for TEE support

Message ID 20240115135249.296822-3-arnaud.pouliquen@foss.st.com
State New
Headers show
Series Introduction of a remoteproc tee to load signed firmware | expand

Commit Message

Arnaud POULIQUEN Jan. 15, 2024, 1:52 p.m. UTC
The "st,stm32mp1-m4-tee" compatible is utilized in a system configuration
where the Cortex-M4 firmware is loaded by the Trusted execution Environment
(TEE).
This compatible is used in both the Linux and OP-TEE device-tree.
- In OP-TEE, a node is defined in the device tree with the
  st,stm32mp1-m4-tee to support signed remoteproc firmware.
  Based on DT properties, OP-TEE authenticates, loads, starts, and stops
  the firmware.
- On Linux, when the compatibility is set, the Cortex-M resets should not
  be declared in the device tree.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
 .../bindings/remoteproc/st,stm32-rproc.yaml   | 53 +++++++++++++++----
 1 file changed, 44 insertions(+), 9 deletions(-)

Comments

Arnaud POULIQUEN Jan. 17, 2024, 7:44 a.m. UTC | #1
On 1/16/24 20:21, Rob Herring wrote:
> On Mon, Jan 15, 2024 at 02:52:47PM +0100, Arnaud Pouliquen wrote:
>> The "st,stm32mp1-m4-tee" compatible is utilized in a system configuration
>> where the Cortex-M4 firmware is loaded by the Trusted execution Environment
>> (TEE).
>> This compatible is used in both the Linux and OP-TEE device-tree.
>> - In OP-TEE, a node is defined in the device tree with the
>>   st,stm32mp1-m4-tee to support signed remoteproc firmware.
>>   Based on DT properties, OP-TEE authenticates, loads, starts, and stops
>>   the firmware.
>> - On Linux, when the compatibility is set, the Cortex-M resets should not
>>   be declared in the device tree.
>>
>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
>> ---
>>  .../bindings/remoteproc/st,stm32-rproc.yaml   | 53 +++++++++++++++----
>>  1 file changed, 44 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> index 370af61d8f28..9fdfa30eff20 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> +++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
>> @@ -16,7 +16,12 @@ maintainers:
>>  
>>  properties:
>>    compatible:
>> -    const: st,stm32mp1-m4
>> +    enum:
>> +      - st,stm32mp1-m4
>> +      - st,stm32mp1-m4-tee
>> +    description:
>> +      Use "st,stm32mp1-m4" for the Cortex-M4 coprocessor management by Linux
> 
> What if other OSs want to manage the M4?

Right, for instance this compatibles are also used by U-boot. I will change
 "by Linux"  by "by non secure context"


> 
>> +      Use "st,stm32mp1-m4-tee" for the Cortex-M4 coprocessor management by secure context
>>  
>>    reg:
>>      description:
>> @@ -142,21 +147,41 @@ properties:
>>  required:
>>    - compatible
>>    - reg
>> -  - resets
>>  
>>  allOf:
>>    - if:
>>        properties:
>> -        reset-names:
>> -          not:
>> -            contains:
>> -              const: hold_boot
>> +        compatible:
>> +          contains:
>> +            const: st,stm32mp1-m4
>> +    then:
>> +      if:
>> +        properties:
>> +          reset-names:
>> +            not:
>> +              contains:
>> +                const: hold_boot
>> +      then:
>> +        required:
>> +          - st,syscfg-holdboot
>> +          - resets
>> +      else:
>> +        properties:
>> +          st,syscfg-holdboot: false
>> +        required:
>> +          - reset-names
> 
> Looks like a new required property.

I just realize that it does not make sense. We execute this
only if "reset-names" contains "hold_boot".
I will remove it

Thanks!
Arnaud

> 
>> +          - resets
>> +
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: st,stm32mp1-m4-tee
>>      then:
>> -      required:
>> -        - st,syscfg-holdboot
>> -    else:
>>        properties:
>>          st,syscfg-holdboot: false
>> +        reset-names: false
>> +        resets: false
>>  
>>  additionalProperties: false
>>  
>> @@ -188,5 +213,15 @@ examples:
>>        st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
>>        st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
>>      };
>> +  - |
>> +    #include <dt-bindings/reset/stm32mp1-resets.h>
>> +    m4@10000000 {
>> +      compatible = "st,stm32mp1-m4-tee";
>> +      reg = <0x10000000 0x40000>,
>> +            <0x30000000 0x40000>,
>> +            <0x38000000 0x10000>;
>> +      st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
>> +      st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
>> +    };
>>  
>>  ...
>> -- 
>> 2.25.1
>>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
index 370af61d8f28..9fdfa30eff20 100644
--- a/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/st,stm32-rproc.yaml
@@ -16,7 +16,12 @@  maintainers:
 
 properties:
   compatible:
-    const: st,stm32mp1-m4
+    enum:
+      - st,stm32mp1-m4
+      - st,stm32mp1-m4-tee
+    description:
+      Use "st,stm32mp1-m4" for the Cortex-M4 coprocessor management by Linux
+      Use "st,stm32mp1-m4-tee" for the Cortex-M4 coprocessor management by secure context
 
   reg:
     description:
@@ -142,21 +147,41 @@  properties:
 required:
   - compatible
   - reg
-  - resets
 
 allOf:
   - if:
       properties:
-        reset-names:
-          not:
-            contains:
-              const: hold_boot
+        compatible:
+          contains:
+            const: st,stm32mp1-m4
+    then:
+      if:
+        properties:
+          reset-names:
+            not:
+              contains:
+                const: hold_boot
+      then:
+        required:
+          - st,syscfg-holdboot
+          - resets
+      else:
+        properties:
+          st,syscfg-holdboot: false
+        required:
+          - reset-names
+          - resets
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: st,stm32mp1-m4-tee
     then:
-      required:
-        - st,syscfg-holdboot
-    else:
       properties:
         st,syscfg-holdboot: false
+        reset-names: false
+        resets: false
 
 additionalProperties: false
 
@@ -188,5 +213,15 @@  examples:
       st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
       st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
     };
+  - |
+    #include <dt-bindings/reset/stm32mp1-resets.h>
+    m4@10000000 {
+      compatible = "st,stm32mp1-m4-tee";
+      reg = <0x10000000 0x40000>,
+            <0x30000000 0x40000>,
+            <0x38000000 0x10000>;
+      st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
+      st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
+    };
 
 ...