netdev - [RFC PATCH 1/2] dt-bindings: net: h4-bluetooth: add new bindings for hci

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Date:   Tue,  8 Nov 2022 14:55:30 +0900
From:   Dominique Martinet <dominique.martinet@...ark-techno.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>, mizo@...ark-techno.com,
        Dominique Martinet <dominique.martinet@...ark-techno.com>
Subject: [RFC PATCH 1/2] dt-bindings: net: h4-bluetooth: add new bindings for hci_h4

Add devicetree binding to support defining a bluetooth device using the h4
uart protocol

This was tested with a NXP wireless+BT AW-XM458 module, but might
benefit others as the H4 protocol seems often used.

Signed-off-by: Dominique Martinet <dominique.martinet@...ark-techno.com>
---
 .../devicetree/bindings/net/h4-bluetooth.yaml | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/h4-bluetooth.yaml

diff --git a/Documentation/devicetree/bindings/net/h4-bluetooth.yaml b/Documentation/devicetree/bindings/net/h4-bluetooth.yaml
new file mode 100644
index 000000000000..5d11b89ca386
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/h4-bluetooth.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/h4-bluetooth.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: H4 Bluetooth
+
+maintainers:
+  - Dominique Martinet <dominique.martinet@...ark-techno.com>
+
+description:
+  H4 is a common bluetooth over uart protocol.
+  For example, the AW-XM458 is a WiFi + BT module where the WiFi part is
+  connected over PCI (M.2), while BT is connected over serial speaking
+  the H4 protocol. Its firmware is sent on the PCI side.
+
+properties:
+  compatible:
+    enum:
+      - nxp,aw-xm458-bt
+
+  max-speed: true
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/clock/imx8mp-clock.h>
+
+    uart1 {
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_uart1>;
+        assigned-clocks = <&clk IMX8MP_CLK_UART1>;
+        assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_80M>;
+        status = "okay";
+        fsl,dte-mode = <1>;
+        fsl,uart-has-rtscts;
+
+
+        bluetooth {
+            compatible = "nxp,aw-xm458-bt";
+            max-speed = <3000000>;
+        };
+    };
-- 
2.35.1