linux-kernel - [PATCH 1/2] dt-bindings: serial: 8250: support an optional second clock

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Message-ID: <20250408175146.979557-2-elder@riscstar.com>
Date: Tue,  8 Apr 2025 12:51:42 -0500
From: Alex Elder <elder@...cstar.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	gregkh@...uxfoundation.org,
	jirislaby@...nel.org
Cc: benjamin.larsson@...exis.eu,
	bastien.curutchet@...tlin.com,
	andriy.shevchenko@...ux.intel.com,
	u.kleine-koenig@...libre.com,
	lkundrak@...sk,
	devicetree@...r.kernel.org,
	linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: serial: 8250: support an optional second clock

The SpacemiT UART driver requires a bus clock to be enabled in addition
to the primary function clock.  Add the option to specify two clocks
for an 8250-compatible UART, named "core" and "bus".

Signed-off-by: Alex Elder <elder@...cstar.com>
---
 Documentation/devicetree/bindings/serial/8250.yaml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index dc0d52920575f..1adf935b7f36f 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -135,7 +135,11 @@ properties:
   clock-frequency: true
 
   clocks:
-    maxItems: 1
+    oneOf:
+      - maxItems: 1
+      - items:
+          - const: core
+          - const: bus
 
   resets:
     maxItems: 1
-- 
2.45.2