Add BCM43438 as a slave device of uart0 (pl011/ttyAMA0).
This allows to automatically insert the bcm43438 to the bluetooth
subsystem instead of relying on userspace helpers (hciattach).
Overwrite bootargs to use aux uart (ttyS0) instead of ttyAMA0.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxx>
---
.../devicetree/bindings/net/broadcom-bluetooth.txt | 29 ++++++++++++++++++++++
arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts | 17 +++++++++++++
2 files changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
diff --git a/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt b/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
new file mode 100644
index 0000000..c51ea1b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
@@ -0,0 +1,29 @@
+Broadcom Bluetooth Chips
+---------------------
+
+This documents the binding structure and common properties for serial
+attached Broadcom devices.
+
+Serial attached Broadcom devices shall be a child node of the host UART
+device the slave device is attached to.
+
+Required properties:
+
+ - compatible: should contain one of the following:
+ * "brcm,bcm43438-bt"
+
+Optional properties:
+
+ - max-speed: see Documentation/devicetree/bindings/serial/slave-device.txt
+
+Example:
+
+&uart2 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart2_pins>;
+
+ bluetooth {
+ compatible = "brcm,bcm43438-bt";
+ max-speed = <921600>;
+ };
+};
diff --git a/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts b/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
index 972f14d..d0c669a 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
@@ -8,6 +8,11 @@
compatible = "raspberrypi,3-model-b", "brcm,bcm2837";
model = "Raspberry Pi 3 Model B";
+ chosen {
+ /* BCM2835 8250 auxiliar UART instead of pl011 */
+ bootargs = "console=ttyS0,115200 earlycon";
+ };
+
memory {
reg = <0 0x40000000>;
};
@@ -39,3 +44,15 @@
status = "okay";
bus-width = <4>;
};
+
+/* UART0 is used to drive bcm43438 bluetooth controller */
+&uart0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart0_gpio32 &gpclk2_gpio43>;
+ status = "okay";
+
+ bluetooth {
+ compatible = "brcm,bcm43438-bt";
+ max-speed = <921600>;
+ };
+};
--
1.9.1
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