linux-kernel - [PATCH 1/4] dt-bindings: rtc: stm32: describe pinmux nodes

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Message-ID: <20240711140843.3201530-2-valentin.caron@foss.st.com>
Date: Thu, 11 Jul 2024 16:08:40 +0200
From: Valentin Caron <valentin.caron@...s.st.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC: <linux-rtc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Valentin Caron
	<valentin.caron@...s.st.com>
Subject: [PATCH 1/4] dt-bindings: rtc: stm32: describe pinmux nodes

STM32 RTC is capable to handle 3 specific pins of the soc (out1, out2,
out2_rmp) and to outputs 2 signals (LSCO, alarm-a).

This feature is configured thanks to pinmux nodes and pinctrl framework.
This feature is available with compatible st,stm32mp1-rtc and
st,stm32mp25-rtc only.

Signed-off-by: Valentin Caron <valentin.caron@...s.st.com>
---
 .../devicetree/bindings/rtc/st,stm32-rtc.yaml | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
index 7a0fab721cf1..09221c2f8a0c 100644
--- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
@@ -53,6 +53,28 @@ properties:
       override default rtc_ck parent clock phandle of the new parent clock of rtc_ck
     maxItems: 1
 
+patternProperties:
+  "^rtc-[a-z]*-[0-9]+$":
+    type: object
+    $ref: /schemas/pinctrl/pinmux-node.yaml
+    description: |
+      Configuration of STM32 RTC pins description. STM32 RTC is able to output
+      some signals on specific pins:
+      - LSCO (Low Speed Clock Output) that allow to output LSE clock on a pin.
+      - Alarm out that allow to send a pulse on a pin when alarm A of the RTC
+        expires.
+    additionalProperties: false
+    properties:
+      function:
+        enum:
+          - lsco
+          - alarm-a
+      pins:
+        enum:
+          - out1
+          - out2
+          - out2_rmp
+
 allOf:
   - if:
       properties:
@@ -68,6 +90,9 @@ allOf:
 
         clock-names: false
 
+      patternProperties:
+        "^rtc-[a-z]*-[0-9]+$": false
+
       required:
         - st,syscfg
 
@@ -83,6 +108,9 @@ allOf:
           minItems: 2
           maxItems: 2
 
+      patternProperties:
+        "^rtc-[a-z]*-[0-9]+$": false
+
       required:
         - clock-names
         - st,syscfg
-- 
2.25.1