linux-kernel - [PATCH] drivers: tty: serial: fix Kconfig dependency on SERIAL

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Date:   Wed, 24 Feb 2021 23:42:48 -0500
From:   Julian Braha <julianbraha@...il.com>
To:     jirislaby@...nel.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers: tty: serial: fix Kconfig dependency on SERIAL_CORE

When SERIAL_IMX_EARLYCON is enabled, and SERIAL_CORE is disabled,
Kbuild gives the following warning:

WARNING: unmet direct dependencies detected for SERIAL_EARLYCON
  Depends on [n]: TTY [=y] && HAS_IOMEM [=y] && SERIAL_CORE [=n]
  Selected by [y]:
  - SERIAL_IMX_EARLYCON [=y] && TTY [=y] && HAS_IOMEM [=y] && (ARCH_MXC [=y] || COMPILE_TEST [=n]) && OF [=y]

This is because SERIAL_IMX_EARLYCON selects SERIAL_EARLYCON,
without selecting SERIAL_CORE, despite that config option depending
on SERIAL_CORE.

Signed-off-by: Julian Braha <julianbraha@...il.com>
---
 drivers/tty/serial/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 0c4cd4a348f4..5105fdfb71b8 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -498,6 +498,7 @@ config SERIAL_IMX_EARLYCON
 	bool "Earlycon on IMX serial port"
 	depends on ARCH_MXC || COMPILE_TEST
 	depends on OF
+	select SERIAL_CORE
 	select SERIAL_EARLYCON
 	select SERIAL_CORE_CONSOLE
 	default y if SERIAL_IMX_CONSOLE
--
2.27.0