Re: [PATCH] arm64: dts: qcom: sdm845-mtp: Add WCN3990 BT node

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Hi Anderson,

On 2019-01-17 10:10, Bjorn Andersson wrote:
The SDM845 MTP has a WCN3990 Bluetooth chip on UART6, enable this.

Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/sdm845-mtp.dts | 44 +++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
index af8c6a2445a2..f65d5a674103 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
@@ -17,6 +17,7 @@

 	aliases {
 		serial0 = &uart9;
+		hsuart0 = &uart6;
 	};

 	chosen {
@@ -357,6 +358,10 @@
 	clock-frequency = <400000>;
 };

+&qupv3_id_0 {
+	status = "okay";
+};
+
 &qupv3_id_1 {
 	status = "okay";
 };
@@ -373,6 +378,20 @@
 	cd-gpios = <&tlmm 126 GPIO_ACTIVE_LOW>;
 };

+&uart6 {
+	status = "okay";
+
+	bluetooth {
+		compatible = "qcom,wcn3990-bt";
+
+		vddio-supply = <&vreg_s4a_1p8>;
+		vddxo-supply = <&vreg_l7a_1p8>;
+		vddrf-supply = <&vreg_l17a_1p3>;
+		vddch0-supply = <&vreg_l25a_3p3>;
+		max-speed = <3200000>;
+	};
+};
+
 &uart9 {
 	status = "okay";
 };
@@ -470,6 +489,31 @@
 	};
 };

+&qup_uart6_default {
+	pinmux {
+		pins = "gpio45", "gpio46", "gpio47", "gpio48";
+		function = "qup6";
+	};
+
+	ctsrx {
+		pins = "gpio45", "gpio48";
+		drive-strength = <2>;
+		bias-no-pull;
+	};
+
+	rts {
+		pins = "gpio46";
+		drive-strength = <2>;
+		bias-pull-down;
+	};
+
+	tx {
+		pins = "gpio47";
+		drive-strength = <2>;
+		bias-pull-up;
+	};
+};
+
 &qup_uart9_default {
 	pinconf-tx {
 		pins = "gpio4";


[Bala]:
       GPIO 45 is CTS
       GPIO 46 is RTS
       GPIO 47 is Tx
       GPIO 48 is Rx.

Tx & RTS are inputs to APPS processor, bias should be disable as the source i.e. BT chip will pull them up. CTS & RX are outputs from APPS processor, where as CTS is GPIO which need to toggled, so the default state should be pull down.
             RX is should be pulled up.
when TX & RX are pulled high it indicates that the lines are ideal i.e. no data.

Above is just my assumption, not sure whether they work on MTP.

--
Regards
Balakrishna.



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