diff --git a/src/jtag/drivers/cmsis_dap_usb.c b/src/jtag/drivers/cmsis_dap_usb.c
index 180a91b40..5072de0c7 100644
--- a/src/jtag/drivers/cmsis_dap_usb.c
+++ b/src/jtag/drivers/cmsis_dap_usb.c
@@ -828,7 +828,7 @@ static int cmsis_dap_init(void)
 	return ERROR_OK;
 }
 
-static int cmsis_dap_swd_init(uint8_t trn)
+static int cmsis_dap_swd_init(void)
 {
 	int retval;
 
diff --git a/src/jtag/swd.h b/src/jtag/swd.h
index 2e676b50f..b0db5d2a7 100644
--- a/src/jtag/swd.h
+++ b/src/jtag/swd.h
@@ -58,17 +58,13 @@ static inline uint8_t swd_cmd(bool is_read, bool is_ap, uint8_t regnum)
 struct swd_driver {
 	/**
 	 * Initialize the debug link so it can perform SWD operations.
-	 * @param trn value from WCR: how many clocks
-	 * to not drive the SWDIO line at certain points in
-	 * the SWD protocol (at least 1 clock).
 	 *
 	 * As an example, this would switch a dual-mode debug adapter
 	 * into SWD mode and out of JTAG mode.
 	 *
 	 * @return ERROR_OK on success, else a negative fault code.
 	 */
-	int (*init)(uint8_t trn);
-
+	int (*init)(void);
 
 	/**
 	 * Queued read of an AP or DP register.
diff --git a/src/target/adi_v5_cmsis_dap.c b/src/target/adi_v5_cmsis_dap.c
index 9c13e5a92..9cdf08abe 100644
--- a/src/target/adi_v5_cmsis_dap.c
+++ b/src/target/adi_v5_cmsis_dap.c
@@ -244,7 +244,7 @@ static int cmsis_dap_select(struct command_context *ctx)
 		return ERROR_FAIL;
 	}
 
-	retval = swd->init(1);
+	retval = swd->init();
 	if (retval != ERROR_OK) {
 		LOG_ERROR("unable to init CMSIS-DAP driver");
 		return retval;
diff --git a/src/target/adi_v5_swd.c b/src/target/adi_v5_swd.c
index 31c219e59..f08b0be0e 100644
--- a/src/target/adi_v5_swd.c
+++ b/src/target/adi_v5_swd.c
@@ -380,7 +380,7 @@ static int swd_select(struct command_context *ctx)
 		return ERROR_FAIL;
 	}
 
-	retval = swd->init(1);
+	retval = swd->init();
 	if (retval != ERROR_OK) {
 		LOG_DEBUG("can't init SWD driver");
 		return retval;