linux-kernel - [PATCH v3 1/9] dt-bindings: rng: introduce new compatible for STM32MP13x

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Date:   Thu, 21 Sep 2023 10:02:53 +0200
From:   Gatien Chevallier <gatien.chevallier@...s.st.com>
To:     Olivia Mackall <olivia@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     Lionel Debieve <lionel.debieve@...s.st.com>,
        <linux-crypto@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Gatien Chevallier <gatien.chevallier@...s.st.com>
Subject: [PATCH v3 1/9] dt-bindings: rng: introduce new compatible for STM32MP13x

Introduce st,stm32mp13-rng compatible and add st,rng-lock-conf.

If st,rng-lock-conf is set, the RNG configuration in RNG_CR, RNG_HTCR
and RNG_NSCR will be locked. It is supported starting from the RNG
version present in the STM32MP13

Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
---

Changes in V3:
	- Squashed with: patch [V2 07/10]
	- Declare st,rng-lock-conf at top level and restrain its uses
	  depending on the compatible. I discarded Rob's tag as for
	  the modifications.	

 .../devicetree/bindings/rng/st,stm32-rng.yaml | 20 ++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
index 187b172d0cca..717f6b321f88 100644
--- a/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
+++ b/Documentation/devicetree/bindings/rng/st,stm32-rng.yaml
@@ -15,7 +15,9 @@ maintainers:
 
 properties:
   compatible:
-    const: st,stm32-rng
+    enum:
+      - st,stm32-rng
+      - st,stm32mp13-rng
 
   reg:
     maxItems: 1
@@ -30,11 +32,27 @@ properties:
     type: boolean
     description: If set enable the clock detection management
 
+  st,rng-lock-conf:
+    type: boolean
+    description: If set, the RNG configuration in RNG_CR, RNG_HTCR and
+                  RNG_NSCR will be locked.
+
 required:
   - compatible
   - reg
   - clocks
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - st,stm32-rng
+    then:
+      properties:
+        st,rng-lock-conf: false
+
 additionalProperties: false
 
 examples:
-- 
2.25.1