Messages in this thread | | | Date | Thu, 17 Jan 2019 11:40:35 +0530 | From | Balakrishna Godavarthi <> | Subject | 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@linaro.org> > --- > 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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