linux-kernel - [PATCH v4 1/2] dt-bindings: net: bluetooth: nxp: Add support for power save feature using GPIO

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Message-Id: <20241007131316.626690-2-neeraj.sanjaykale@nxp.com>
Date: Mon,  7 Oct 2024 18:43:15 +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,
	rohit.fule@....com,
	neeraj.sanjaykale@....com,
	sherry.sun@....com,
	ziniu.wang_1@....com,
	haibo.chen@....com,
	LnxRevLi@....com
Subject: [PATCH v4 1/2] dt-bindings: net: bluetooth: nxp: Add support for power save feature using GPIO

This adds a new optional device tree property device-wakeup-gpios, which specifies
the GPIO connected to BT_WAKE_IN pin of the NXP chipset.

If this property is defined, the driver will use this GPIO for driving chip
into sleep/wakeup state, else use the UART break signal by default.

Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@....com>
Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
---
v2: Rephrase description and use "-gpios". (Krzysztof, Rob)
v3: Use device-wakeup-gpios instead of h2c-ps-gpios. (Krzysztof)
v4: Add Reviewed-by (Rob)
---
 .../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 37a65badb448..0a2d7baf5db3 100644
--- a/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml
+++ b/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-bt.yaml
@@ -34,6 +34,12 @@ properties:
   firmware-name:
     maxItems: 1
 
+  device-wakeup-gpios:
+    maxItems: 1
+    description:
+      Host-To-Chip power save mechanism is driven by this GPIO
+      connected to BT_WAKE_IN pin of the NXP chipset.
+
 required:
   - compatible
 
@@ -41,10 +47,12 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/gpio/gpio.h>
     serial {
         bluetooth {
             compatible = "nxp,88w8987-bt";
             fw-init-baudrate = <3000000>;
             firmware-name = "uartuart8987_bt_v0.bin";
+            device-wakeup-gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
         };
     };
-- 
2.25.1