add ttyprintk driver

Ttyprintk is a pseudo TTY driver, which allows users to make printk
messages, via output to ttyprintk device. It is possible to store
"console" messages inline with kernel messages for better analyses of
the boot process, for example.

Signed-off-by: Samo Pogacnik <samo_pogacnik@t-2.net>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 3d44ec724c17..43d3395325c5 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -493,6 +493,21 @@ config LEGACY_PTY_COUNT
           When not in use, each legacy PTY occupies 12 bytes on 32-bit
           architectures and 24 bytes on 64-bit architectures.
 
+config TTY_PRINTK
+        bool "TTY driver to output user messages via printk"
+        depends on EMBEDDED
+        default n
+        ---help---
+          If you say Y here, the support for writing user messages (i.e.
+          console messages) via printk is available.
+
+          The feature is useful to inline user messages with kernel
+          messages.
+          In order to use this feature, you should output user messages
+          to /dev/ttyprintk or redirect console to this TTY.
+
+          If unsure, say N.
+
 config BRIQ_PANEL
         tristate 'Total Impact briQ front panel driver'
         depends on PPC_CHRP