linux-kernel - [PATCH v2 1/2] dt-bindings: net: broadcom-bluetooth: Add property for autobaud mode

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Date:   Fri, 20 May 2022 17:07:13 +0200
From:   Hakan Jansson <hakan.jansson@...ineon.com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Hakan Jansson <hakan.jansson@...ineon.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "Luiz Augusto von Dentz" <luiz.dentz@...il.com>,
        <linux-bluetooth@...r.kernel.org>
Subject: [PATCH v2 1/2] dt-bindings: net: broadcom-bluetooth: Add property for autobaud mode

Some devices (e.g. CYW5557x) require autobaud mode to enable FW loading.
Autobaud mode can also be required on some boards where the controller
device is using a non-standard baud rate when first powered on.

This patch adds a property, "brcm,uses-autobaud-mode", to enable autobaud
mode selection.

Signed-off-by: Hakan Jansson <hakan.jansson@...ineon.com>
---
V1 -> V2: Modify property description

 .../devicetree/bindings/net/broadcom-bluetooth.yaml      | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml b/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml
index 5aac094fd217..a29f059c21cc 100644
--- a/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml
+++ b/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml
@@ -92,6 +92,15 @@ properties:
        pcm-sync-mode: slave, master
        pcm-clock-mode: slave, master
 
+  brcm,uses-autobaud-mode:
+    type: boolean
+    description: >
+      Setting this property will make the host (driver) assert the controller
+      chip's BT_UART_CTS_N prior to asserting BT_REG_ON. This will make the
+      controller start up in autobaud mode. The controller will then detect the
+      baud rate of the first incoming (HCI Reset) command from the host and
+      subsequently use that baud rate.
+
   interrupts:
     items:
       - description: Handle to the line HOST_WAKE used to wake
-- 
2.25.1