linux-kernel - [PATCH 1/1] dt-bindings: serial: 8250: allow clock 'uartclk' and 'reg' for nxp,lpc1850-uart

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Message-Id: <20250602142745.942568-1-Frank.Li@nxp.com>
Date: Mon,  2 Jun 2025 10:27:45 -0400
From: Frank Li <Frank.Li@....com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Yixun Lan <dlan@...too.org>,
	Lubomir Rintel <lkundrak@...sk>,
	devicetree@...r.kernel.org (in file),
	linux-kernel@...r.kernel.org (open list:TTY LAYER AND SERIAL DRIVERS),
	linux-serial@...r.kernel.org (open list:TTY LAYER AND SERIAL DRIVERS),
	linux-riscv@...ts.infradead.org (open list:RISC-V SPACEMIT SoC Support:Keyword:spacemit),
	spacemit@...ts.linux.dev (open list:RISC-V SPACEMIT SoC Support:Keyword:spacemit)
Cc: imx@...ts.linux.dev
Subject: [PATCH 1/1] dt-bindings: serial: 8250: allow clock 'uartclk' and 'reg' for nxp,lpc1850-uart

Allow clock 'uartclk' and 'reg' for nxp,lpc1850-uart to align existed
driver and dts. It is really old platform. Keep the same restriction for
others.

Allow dmas and dma-names property, which allow maxItems 4 because very old
platform (arch/arm/boot/dts/nxp/lpc/lpc18xx.dtsi) use duplicate "tx", "rx",
"tx", "rx" as dma-names.

Fix below CHECK_DTB warnings:
  arch/arm/boot/dts/nxp/lpc/lpc4337-ciaa.dtb: serial@...81000 (nxp,lpc1850-uart): clock-names: ['uartclk', 'reg'] is too long

Signed-off-by: Frank Li <Frank.Li@....com>
---
 .../devicetree/bindings/serial/8250.yaml      | 41 +++++++++++++++++--
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index 33d2016b65090..08b8d7c6df0fd 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -49,6 +49,24 @@ allOf:
         - required: [ clock-frequency ]
         - required: [ clocks ]
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nxp,lpc1850-uart
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: uartclk
+            - const: reg
+    else:
+      properties:
+        clock-names:
+          items:
+            - const: core
+            - const: bus
+
 properties:
   compatible:
     oneOf:
@@ -142,9 +160,22 @@ properties:
 
   clock-names:
     minItems: 1
-    items:
-      - const: core
-      - const: bus
+    maxItems: 2
+    oneOf:
+      - items:
+          - const: core
+          - const: bus
+      - items:
+          - const: uartclk
+          - const: reg
+
+  dmas:
+    minItems: 1
+    maxItems: 4
+
+  dma-names:
+    minItems: 1
+    maxItems: 4
 
   resets:
     maxItems: 1
@@ -237,7 +268,9 @@ if:
   properties:
     compatible:
       contains:
-        const: spacemit,k1-uart
+        enum:
+          - spacemit,k1-uart
+          - nxp,lpc1850-uart
 then:
   required: [clock-names]
   properties:
-- 
2.34.1