Add sleep state for BT uart to support the wakeup feature.
Signed-off-by: satya priya <skakit@xxxxxxxxxxxxxx>
Reviewed-by: Akash Asthana <akashast@xxxxxxxxxxxxxx>
---
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.
arch/arm64/boot/dts/qcom/sc7180-idp.dts | 37 +++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
index cecac3e..77e3523 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
+++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
@@ -507,6 +507,43 @@
};
};
+&qup_uart3_sleep {
+ pinconf-cts {
+ /*
+ * Configure no-pull on CTS. As this is driven by BT, do not
+ * specify any pull in order to not conflict with BT pulls.
+ */
+ pins = "gpio38";
+ bias-disable;
+ };
+
+ pinconf-rts {
+ /*
+ * Configure pull-down on RTS to make sure that the BT SoC can
+ * wake up the system by sending wakeup bytes during suspend.
+ */
+ pins = "gpio39";
+ bias-pull-down;
+ };
+
+ pinconf-tx {
+ /* Configure pull-up on TX when it isn't actively driven */
+ 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
+ * in tri-state (module powered off or not driving the
+ * signal yet).
+ */
+ pins = "gpio41";
+ bias-pull-up;
+ };
+};
+
&qup_uart8_default {
pinconf-tx {
pins = "gpio44";
--
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