[PATCH 1/2] arch: arm64: qcom: sdm845-shift-axolotl: fix Bluetooth firmware loading

[Alexander Martinz <amartinz@shiftphones.com>]

From: Dylan Van Assche <me@dylanvanassche.be>

Add hsuart0 alias, firmware name and prevent garbage data on Bluetooth UART lines
on the SHIFT 6mq based on the Qualcomm SDM845 chip.
I discovered that these were missing by comparing the DTS with similar
devices such as the Oneplus 6/6T and Dragonboard 845c.

Signed-of-by: Dylan Van Assche <me@dylanvanassche.be>
Tested-by: Alexander Martinz <amartinz@shiftphones.com>
---
 .../boot/dts/qcom/sdm845-shift-axolotl.dts    | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts b/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts
index 103cc40816fd..fa72f23ef0c2 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts
@@ -20,6 +20,7 @@ / {
 
 	aliases {
 		display0 = &framebuffer0;
+		hsuart0 = &uart6;
 		serial0 = &uart9;
 	};
 
@@ -529,6 +530,32 @@ volume_down_resin: resin {
 	};
 };
 
+/*
+ * Prevent garbage data on bluetooth UART lines
+ */
+&qup_uart6_default {
+        pinmux {
+                pins = "gpio45", "gpio46", "gpio47", "gpio48";
+                function = "qup6";
+        };
+
+        cts {
+                pins = "gpio45";
+                bias-pull-down;
+        };
+
+        rts-tx {
+                pins = "gpio46", "gpio47";
+                drive-strength = <2>;
+                bias-disable;
+        };
+
+        rx {
+                pins = "gpio48";
+                bias-pull-up;
+        };
+};
+
 &qup_uart9_default {
 	pinconf-rx {
 		pins = "gpio5";
@@ -667,6 +694,12 @@ &uart6 {
 	bluetooth {
 		compatible = "qcom,wcn3990-bt";
 
+		/*
+		 * This path is relative to the qca/
+		 * subdir under lib/firmware.
+		 */
+		firmware-name = "axolotl/crnv21.bin";
+
 		vddio-supply = <&vreg_s4a_1p8>;
 		vddxo-supply = <&vreg_l7a_1p8>;
 		vddrf-supply = <&vreg_l17a_1p3>;
-- 
2.36.1