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-rw-r--r--src/jtag/jtag.c2
-rw-r--r--src/jtag/jtag.h3
2 files changed, 3 insertions, 2 deletions
diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c
index fc89d248..7d0dcab9 100644
--- a/src/jtag/jtag.c
+++ b/src/jtag/jtag.c
@@ -1411,7 +1411,7 @@ int jtag_register_commands(struct command_context_s *cmd_ctx)
register_command(cmd_ctx, NULL, "jtag_speed", handle_jtag_speed_command,
COMMAND_ANY, "set jtag speed (if supported) <reset speed> [<post reset speed, default value is reset speed>]");
register_command(cmd_ctx, NULL, "jtag_khz", handle_jtag_khz_command,
- COMMAND_ANY, "same as jtag_speed, except it takes khz as arguments");
+ COMMAND_ANY, "same as jtag_speed, except it takes maximum khz as arguments. 0 KHz = RTCK.");
register_command(cmd_ctx, NULL, "jtag_device", handle_jtag_device_command,
COMMAND_CONFIG, "jtag_device <ir_length> <ir_expected> <ir_mask>");
register_command(cmd_ctx, NULL, "reset_config", handle_reset_config_command,
diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h
index 16eb84dd..fca7c350 100644
--- a/src/jtag/jtag.h
+++ b/src/jtag/jtag.h
@@ -195,7 +195,8 @@ typedef struct jtag_interface_s
int (*register_commands)(struct command_context_s *cmd_ctx);
int (*init)(void);
int (*quit)(void);
- /* returns JTAG speed for KHz. */
+ /* returns JTAG maxium speed for KHz. 0=RTCK. The function returns
+ a failure if it can't support the KHz/RTCK. */
int (*khz)(int khz, int *jtag_speed);
} jtag_interface_t;