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arm64: dts: qcom: sc7180: Add wakeup support for BT UART on sc7180-idp

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Add the necessary pinctrl, interrupt property and a suitable sleep config
to support Bluetooth wakeup feature.

GPIO mode is configured in sleep state to drive the RTS/RFR line low.
If QUP function is selected in sleep state, UART RTS/RFR is pulled high
during suspend and BT SoC not able to send wakeup bytes.

Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: satya priya <skakit@codeaurora.org>
Link: https://lore.kernel.org/r/1600091917-7464-3-git-send-email-skakit@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
satya priya 2020-09-14 19:28:35 +05:30 committed by Bjorn Andersson
parent ff11a79878
commit 9a36c6fd09
1 changed files with 55 additions and 0 deletions
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55
arch/arm64/boot/dts/qcom/sc7180-idp.dts
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@ -346,6 +346,13 @@
&uart3 {
status = "okay";
/delete-property/interrupts;
interrupts-extended = <&intc GIC_SPI 604 IRQ_TYPE_LEVEL_HIGH>,
<&tlmm 41 IRQ_TYPE_EDGE_FALLING>;
pinctrl-names = "default", "sleep";
pinctrl-1 = <&qup_uart3_sleep>;
bluetooth: wcn3990-bt {
compatible = "qcom,wcn3990-bt";
vddio-supply = <&vreg_l10a_1p8>;
@ -544,3 +551,51 @@
};
};
&tlmm {
qup_uart3_sleep: qup-uart3-sleep {
pinmux {
pins = "gpio38", "gpio39",
"gpio40", "gpio41";
function = "gpio";
};
pinconf-cts {
/*
* Configure a pull-down on CTS to match the pull of
* the Bluetooth module.
*/
pins = "gpio38";
bias-pull-down;
};
pinconf-rts {
/*
* Configure pull-down on RTS. As RTS is active low
* signal, pull it low to indicate the BT SoC that it
* can wakeup the system anytime from suspend state by
* pulling RX low (by sending wakeup bytes).
*/
pins = "gpio39";
bias-pull-down;
};
pinconf-tx {
/*
* Configure pull-up on TX when it isn't actively driven
* to prevent BT SoC from receiving garbage during sleep.
*/
pins = "gpio40";
bias-pull-up;
};
pinconf-rx {
/*
* Configure a pull-up on RX. This is needed to avoid
* garbage data when the TX pin of the Bluetooth module
* is floating which may cause spurious wakeups.
*/
pins = "gpio41";
bias-pull-up;
};
};
};