linux-kernel - [PATCH v6 1/2] dt-bindings: net: bluetooth: nxp: Add support for 4M baudrate

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Message-Id: <20250623091322.131502-1-neeraj.sanjaykale@nxp.com>
Date: Mon, 23 Jun 2025 14:43:21 +0530
From: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
To: marcel@...tmann.org,
	luiz.dentz@...il.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	amitkumar.karwar@....com,
	neeraj.sanjaykale@....com,
	sherry.sun@....com,
	manjeet.gupta@....com
Subject: [PATCH v6 1/2] dt-bindings: net: bluetooth: nxp: Add support for 4M baudrate

Add support for 4000000 as secondary baudrate for NXP chipsets
supporting max baudrate as 4M, and are close to the host processor on
same PCB. This mainly helps with faster FW download.

Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
v2: Use the available 'max-speed' device tree property. (Krzysztof)
v3: No Change
v4: Add ref for max-speed. (Krzysztof)
v5: Add ref for serial-peripheral-props.yaml. (Krzysztof)
v6: Add info to commit message. (Krzysztof)
---
 .../devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml b/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml
index 3ab60c70286f..bb9ab5dd3b4a 100644
--- a/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml
+++ b/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml
@@ -34,6 +34,13 @@ properties:
       This property depends on the module vendor's
       configuration.
 
+  max-speed:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum:
+      - 3000000
+      - 4000000
+    default: 3000000
+
   firmware-name:
     maxItems: 1
 
@@ -78,6 +85,7 @@ examples:
         bluetooth {
             compatible = "nxp,88w8987-bt";
             fw-init-baudrate = <3000000>;
+            max-speed = <4000000>;
             firmware-name = "uartuart8987_bt_v0.bin";
             device-wakeup-gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
             nxp,wakein-pin = /bits/ 8 <18>;
-- 
2.34.1