Commit 9a36c6fd authored by satya priya's avatar satya priya Committed by Bjorn Andersson
Browse files

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



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: default avatarMatthias Kaehlcke <mka@chromium.org>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Signed-off-by: default avatarsatya priya <skakit@codeaurora.org>
Link: https://lore.kernel.org/r/1600091917-7464-3-git-send-email-skakit@codeaurora.org


Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent ff11a798

arch/arm64/boot/dts/qcom/sc7180-idp.dts

+55 −0
Original line number Diff line number Diff line
@@ -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;

		};

	};

};