From fc9669bcfd233dbd45ef1000a0c7a0deeabe2f8a Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Date: Thu, 23 Nov 2023 13:32:18 +0100
Subject: [PATCH] drivers/periph/uart: add periph_uart_tx_ondemand feature

---
 drivers/include/periph/uart.h | 18 ++++++++++++++++++
 kconfigs/Kconfig.features     |  5 +++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/include/periph/uart.h b/drivers/include/periph/uart.h
index 7f80461fba..33a04782fb 100644
--- a/drivers/include/periph/uart.h
+++ b/drivers/include/periph/uart.h
@@ -381,6 +381,24 @@ void uart_poweron(uart_t uart);
  */
 void uart_poweroff(uart_t uart);
 
+/**
+ * @brief Enable the TX line one the given UART
+ *
+ * @note requires the `periph_uart_tx_ondemand` feature
+ *
+ * @param[in] uart          the UART device start TX on
+ */
+void uart_enable_tx(uart_t uart);
+
+/**
+ * @brief Disable the TX line one the given UART
+ *
+ * @note requires the `periph_uart_tx_ondemand` feature
+ *
+ * @param[in] uart          the UART device to stop TX on
+ */
+void uart_disable_tx(uart_t uart);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/kconfigs/Kconfig.features b/kconfigs/Kconfig.features
index cb824d97b1..9815cc1f57 100644
--- a/kconfigs/Kconfig.features
+++ b/kconfigs/Kconfig.features
@@ -587,6 +587,11 @@ config HAS_PERIPH_UART_MODECFG
     help
         Indicates that the UART peripheral allows mode configuration.
 
+config HAS_PERIPH_UART_TX_ONDEMAND
+    bool
+    help
+        Indicates that the UART peripheral can enable the TX line on demmand.
+
 config HAS_PERIPH_UART_NONBLOCKING
     bool
     help