@@ -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>;
@@ -545,3 +552,51 @@
};
};
+&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;
+ };
+ };
+};
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. Signed-off-by: satya priya <skakit@codeaurora.org> --- Changes in V2: - This patch adds sleep state for BT UART. Newly added in V2. Changes in V3: - Remove "output-high" for TX from both sleep and default states as it is not required. Configure pull-up for TX in sleep state. Changes in V4: - As per Matthias's comment, removed drive-strength for sleep state and fixed nit-pick. Changes in V5: - As per Matthias's comments, moved pinmux change for sleep state, pinctrl and interrupt config to the board specific file. Changes in V6: - As per Doug's comments changed subject, deleted interrupts property. - As per Bjorn's comments changed commit text and rationale for RTS, TX and RX. arch/arm64/boot/dts/qcom/sc7180-idp.dts | 55 +++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+)