app: Take DTR/RI into use

DTR-uart is taken into use in the Serial Modem application.

Following Kconfigs are removed and replaced with devicetree
overlays: CONFIG_SM_POWER_PIN, CONFIG_SM_INDICATE_PIN and
CONFIG_SM_INDICATE_TIME.

Signed-off-by: Markus Lassila <markus.lassila@nordicsemi.no>

Author: MarkusLassila

app/Kconfig

@@ -86,26 +86,7 @@ config SM_START_SLEEP
 	bool "Enter sleep on startup"
 	help
 	  If enabled, the SiP is put into deep sleep when powered on.
-	  It can then be started using SM_POWER_PIN.
-
-config SM_POWER_PIN
-	int "Power pin"
-	default -1
-	help
-	  Interface GPIO pin used to put the SiP into deep sleep and wake up from it or exit idle.
-	  The pin is configured with a pull up and must be pulled down shortly to perform one power off or wake up operation.
-
-config SM_INDICATE_PIN
-	int "Indicate pin"
-	default -1
-	help
-	  Interface GPIO pin used to indicate that data is available when Serial Modem is idle (after #XSLEEP=2 AT command).
-
-config SM_INDICATE_TIME
-	int "Indication period"
-	default 100
-	help
-	  GPIO active indication time in milliseconds. This setting specify the period length for the pin to be active
+	  TODO: DTR to wake up from sleep is not implemented yet.
 
 #
 # Automatic network attach

app/boards/nrf9131ek_nrf9131_ns.conf

@@ -6,11 +6,24 @@
 
 / {
 	chosen {
-		ncs,sm-uart = &uart0;
+		ncs,sm-uart = &dtr_uart0;
 	};
 };
 
 &uart0 {
 	status = "okay";
 	hw-flow-control;
+
+	dtr_uart0: dtr-uart {
+		compatible = "nordic,dtr-uart";
+		dtr-gpios = <&gpio0 28 (GPIO_PULL_UP | GPIO_ACTIVE_HIGH)>;
+		ri-gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+		status = "okay";
+	};
+};
+
+&gpio0 {
+	status = "okay";
+	/* Use PORT event for DTR (28) pin to save power */
+	sense-edge-mask = <0x10000000>;
 };

app/boards/nrf9131ek_nrf9131_ns.overlay

@@ -4,56 +4,35 @@
  * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
  */
 
- / {
+/ {
 	chosen {
-		ncs,sm-uart = &uart0;
+		ncs,sm-uart = &dtr_uart0;
 	};
 };
 
+/* DTR with DK */
 &uart0 {
 	status = "okay";
 	hw-flow-control;
-};
 
-&uart2 {
-	compatible = "nordic,nrf-uarte";
-	current-speed = <115200>;
-	status = "disabled";
-	hw-flow-control;
+	dtr_uart0: dtr-uart {
+		compatible = "nordic,dtr-uart";
+		dtr-gpios = <&gpio0 8 (GPIO_PULL_UP | GPIO_ACTIVE_HIGH)>;
+		ri-gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+		status = "okay";
+	};
+};
 
-	pinctrl-0 = <&uart2_default_alt>;
-	pinctrl-1 = <&uart2_sleep_alt>;
-	pinctrl-names = "default", "sleep";
+&gpio0 {
+	status = "okay";
+	/* Use PORT event for DTR (8) pin to save power */
+	sense-edge-mask = <0x00000100>;
 };
 
 &i2c2 {
 	status = "disabled";
 };
 
-&pinctrl {
-	uart2_default_alt: uart2_default_alt {
-		group1 {
-			psels = <NRF_PSEL(UART_RX, 0, 11)>;
-			bias-pull-up;
-		};
-		group2 {
-			psels = <NRF_PSEL(UART_TX, 0, 10)>,
-				<NRF_PSEL(UART_RTS, 0, 12)>,
-				<NRF_PSEL(UART_CTS, 0, 13)>;
-		};
-	};
-
-	uart2_sleep_alt: uart2_sleep_alt {
-		group1 {
-			psels = <NRF_PSEL(UART_TX, 0, 10)>,
-				<NRF_PSEL(UART_RX, 0, 11)>,
-				<NRF_PSEL(UART_RTS, 0, 12)>,
-				<NRF_PSEL(UART_CTS, 0, 13)>;
-			low-power-enable;
-		};
-	};
-};
-
 /* Enable external flash */
 &gd25wb256 {
 	status = "okay";

app/boards/nrf9151dk_nrf9151_ns.conf

@@ -6,50 +6,29 @@
 
 / {
 	chosen {
-		ncs,sm-uart = &uart0;
+		ncs,sm-uart = &dtr_uart0;
 	};
 };
 
+/* DTR with DK */
 &uart0 {
 	status = "okay";
 	hw-flow-control;
-};
 
-&uart2 {
-	compatible = "nordic,nrf-uarte";
-	current-speed = <115200>;
-	status = "disabled";
-	hw-flow-control;
+	dtr_uart0: dtr-uart {
+		compatible = "nordic,dtr-uart";
+		dtr-gpios = <&gpio0 6 (GPIO_PULL_UP | GPIO_ACTIVE_HIGH)>; /* button0 */
+		ri-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>; /* led0 */
+		status = "okay";
+	};
+};
 
-	pinctrl-0 = <&uart2_default_alt>;
-	pinctrl-1 = <&uart2_sleep_alt>;
-	pinctrl-names = "default", "sleep";
+&gpio0 {
+	status = "okay";
+	/* Use PORT event for DTR (6) pin to save power */
+	sense-edge-mask = <0x00000040>;
 };
 
 &i2c2 {
 	status = "disabled";
 };
-
-&pinctrl {
-	uart2_default_alt: uart2_default_alt {
-		group1 {
-			psels = <NRF_PSEL(UART_RX, 0, 11)>;
-			bias-pull-up;
-		};
-		group2 {
-			psels = <NRF_PSEL(UART_TX, 0, 10)>,
-				<NRF_PSEL(UART_RTS, 0, 12)>,
-				<NRF_PSEL(UART_CTS, 0, 13)>;
-		};
-	};
-
-	uart2_sleep_alt: uart2_sleep_alt {
-		group1 {
-			psels = <NRF_PSEL(UART_TX, 0, 10)>,
-				<NRF_PSEL(UART_RX, 0, 11)>,
-				<NRF_PSEL(UART_RTS, 0, 12)>,
-				<NRF_PSEL(UART_CTS, 0, 13)>;
-			low-power-enable;
-		};
-	};
-};

app/boards/nrf9151dk_nrf9151_ns.overlay

@@ -6,54 +6,33 @@
 
 / {
 	chosen {
-		ncs,sm-uart = &uart0;
+		ncs,sm-uart = &dtr_uart0;
 	};
 };
 
+/* DTR with DK */
 &uart0 {
 	status = "okay";
 	hw-flow-control;
-};
 
-&uart2 {
-	compatible = "nordic,nrf-uarte";
-	current-speed = <115200>;
-	status = "disabled";
-	hw-flow-control;
+	dtr_uart0: dtr-uart {
+		compatible = "nordic,dtr-uart";
+		dtr-gpios = <&gpio0 8 (GPIO_PULL_UP | GPIO_ACTIVE_HIGH)>;
+		ri-gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+		status = "okay";
+	};
+};
 
-	pinctrl-0 = <&uart2_default_alt>;
-	pinctrl-1 = <&uart2_sleep_alt>;
-	pinctrl-names = "default", "sleep";
+&gpio0 {
+	status = "okay";
+	/* Use PORT event for DTR (8) pin to save power */
+	sense-edge-mask = <0x00000100>;
 };
 
 &i2c2 {
 	status = "disabled";
 };
 
-&pinctrl {
-	uart2_default_alt: uart2_default_alt {
-		group1 {
-			psels = <NRF_PSEL(UART_RX, 0, 11)>;
-			bias-pull-up;
-		};
-		group2 {
-			psels = <NRF_PSEL(UART_TX, 0, 10)>,
-				<NRF_PSEL(UART_RTS, 0, 12)>,
-				<NRF_PSEL(UART_CTS, 0, 13)>;
-		};
-	};
-
-	uart2_sleep_alt: uart2_sleep_alt {
-		group1 {
-			psels = <NRF_PSEL(UART_TX, 0, 10)>,
-				<NRF_PSEL(UART_RX, 0, 11)>,
-				<NRF_PSEL(UART_RTS, 0, 12)>,
-				<NRF_PSEL(UART_CTS, 0, 13)>;
-			low-power-enable;
-		};
-	};
-};
-
 /* Enable external flash */
 &gd25wb256 {
 	status = "okay";