From: Geert Uytterhoeven <geert@linux-m68k.org>

Hi Fugan,

On Fri, Jul 24, 2020 at 9:17 AM Fugang Duan [off-list ref] wrote:

quoted

Split imx earlycon driver from imx serial driver "imx.c" as separated
driver. imx serial driver can be built as module, but earlycon driver
only support build in.

Signed-off-by: Fugang Duan <redacted>

Thanks for your patch, which is now commit 699cc4dfd14071e4 ("tty: serial:
imx: add imx earlycon driver") in tty-next.

quoted

 drivers/tty/serial/Kconfig        |  8 +++++
 drivers/tty/serial/imx_earlycon.c | 50
+++++++++++++++++++++++++++++++

Seems like imx_earlycon.c is never built, as no Makefile update is included?
Else this patch is just an obfuscated way to enable SERIAL_EARLYCON for all OF
platforms? ;-)

quoted

--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig

@@ -515,6 +515,14 @@ config SERIAL_IMX_CONSOLE
          "console=ttymxc0". (Try "man bootparam" or see the

documentation of

quoted

          your bootloader about how to pass options to the kernel at
boot time.)

+config SERIAL_IMX_EARLYCON
+       bool "Earlycon on IMX serial port"
+       depends on OF

Obviously this should depend on "ARCH_MXC || COMPILE_TEST".

I will submit another patch for it.
Thanks!

quoted

+       select SERIAL_EARLYCON
+       help
+         If you have enabled the earlycon on the Freescale IMX
+         CPU you can make it the earlycon by answering Y to this option.
+
 config SERIAL_UARTLITE
        tristate "Xilinx uartlite serial port support"
        depends on HAS_IOMEM

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But when
I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds