Add bluetooth uart pin configuration for sc7280-idp.
Signed-off-by: Rajesh Patil <rajpat@xxxxxxxxxxxxxx>
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
---
Changes in V8:
- No changes
arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 85 ++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
index cf82301..52638e2 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
@@ -301,6 +301,16 @@
vdda18-supply = <&vreg_l1c_1p8>;
};
+&uart7 {
+ status = "okay";
+
+ /delete-property/interrupts;
+ interrupts-extended = <&intc GIC_SPI 608 IRQ_TYPE_LEVEL_HIGH>,
+ <&tlmm 31 IRQ_TYPE_EDGE_FALLING>;
+ pinctrl-names = "default", "sleep";
+ pinctrl-1 = <&qup_uart7_sleep_cts>, <&qup_uart7_sleep_rts>, <&qup_uart7_sleep_tx>, <&qup_uart7_sleep_rx>;
+};
+
/* PINCTRL - additions to nodes defined in sc7280.dtsi */
&qspi_cs0 {
@@ -326,6 +336,81 @@
bias-pull-up;
};
+&qup_uart7_cts {
+ /*
+ * Configure a pull-down on CTS to match the pull of
+ * the Bluetooth module.
+ */
+ bias-pull-down;
+};
+
+&qup_uart7_rts {
+ /* We'll drive RTS, so no pull */
+ drive-strength = <2>;
+ bias-disable;
+};
+
+&qup_uart7_tx {
+ /* We'll drive TX, so no pull */
+ drive-strength = <2>;
+ bias-disable;
+};
+
+&qup_uart7_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).
+ */
+ bias-pull-up;
+};
+
+&tlmm {
+ qup_uart7_sleep_cts: qup-uart7-sleep-cts {
+ pins = "gpio28";
+ function = "gpio";
+ /*
+ * Configure a pull-down on CTS to match the pull of
+ * the Bluetooth module.
+ */
+ bias-pull-down;
+ };
+
+ qup_uart7_sleep_rts: qup-uart7-sleep-rts {
+ pins = "gpio29";
+ function = "gpio";
+ /*
+ * 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).
+ */
+ bias-pull-down;
+ };
+
+ qup_uart7_sleep_tx: qup-uart7-sleep-tx {
+ pins = "gpio30";
+ function = "gpio";
+ /*
+ * Configure pull-up on TX when it isn't actively driven
+ * to prevent BT SoC from receiving garbage during sleep.
+ */
+ bias-pull-up;
+ };
+
+ qup_uart7_sleep_rx: qup-uart7-sleep-rx {
+ pins = "gpio31";
+ function = "gpio";
+ /*
+ * 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.
+ */
+ bias-pull-up;
+ };
+};
+
&sdc1_on {
clk {
bias-disable;
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
