linux-kernel - [PATCH v2] ARM: sunplus: fix serial console kconfig and build problems

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Date:   Wed, 31 Aug 2022 17:08:21 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Qin Jian <qinjian@...lus1.com>,
        Necip Fazil Yildiran <fazilyildiran@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, patches@...linux.org.uk
Subject: [PATCH v2] ARM: sunplus: fix serial console kconfig and build problems

Fix kconfig dependency warnings and subsequent build errors:

WARNING: unmet direct dependencies detected for SERIAL_SUNPLUS
  Depends on [n]: TTY [=n] && HAS_IOMEM [=y] && (ARCH_SUNPLUS [=y] || COMPILE_TEST [=n])
  Selected by [y]:
  - SOC_SP7021 [=y] && ARCH_SUNPLUS [=y]

WARNING: unmet direct dependencies detected for SERIAL_SUNPLUS_CONSOLE
  Depends on [n]: TTY [=n] && HAS_IOMEM [=y] && SERIAL_SUNPLUS [=y]
  Selected by [y]:
  - SOC_SP7021 [=y] && ARCH_SUNPLUS [=y]

(samples, not all:)
drivers/tty/serial/sunplus-uart.c:342: undefined reference to `uart_get_baud_rate'
arm-linux-gnueabi-ld: drivers/tty/serial/sunplus-uart.c:379: undefined reference to `uart_update_timeout'
drivers/tty/serial/sunplus-uart.c:526: undefined reference to `uart_console_write'
arm-linux-gnueabi-ld: drivers/tty/serial/sunplus-uart.c:274: undefined reference to `tty_flip_buffer_push'
arm-linux-gnueabi-ld: drivers/tty/serial/sunplus-uart.o:(.data+0xa8): undefined reference to `uart_console_device'
drivers/tty/serial/sunplus-uart.c:720: undefined reference to `uart_register_driver'
arm-linux-gnueabi-ld: drivers/tty/serial/sunplus-uart.c:726: undefined reference to `uart_unregister_driver'
drivers/tty/serial/sunplus-uart.c:551: undefined reference to `uart_parse_options'
arm-linux-gnueabi-ld: drivers/tty/serial/sunplus-uart.c:553: undefined reference to `uart_set_options'

This is the same technique that is used 2 times in
arch/arm/mach-versatile/Kconfig.

Fixes: 0aa94eea8d95 ("ARM: sunplus: Add initial support for Sunplus SP7021 SoC")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Qin Jian <qinjian@...lus1.com>
Cc: Necip Fazil Yildiran <fazilyildiran@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: patches@...linux.org.uk
---
KernelVersion: 6.0-rc3
v2: refresh;
    add KernelVersion & patches@...linux email;

 arch/arm/mach-sunplus/Kconfig |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm/mach-sunplus/Kconfig
+++ b/arch/arm/mach-sunplus/Kconfig
@@ -18,8 +18,8 @@ config SOC_SP7021
 	select ARM_PSCI
 	select PINCTRL
 	select PINCTRL_SPPCTL
-	select SERIAL_SUNPLUS
-	select SERIAL_SUNPLUS_CONSOLE
+	select SERIAL_SUNPLUS if TTY
+	select SERIAL_SUNPLUS_CONSOLE if TTY
 	help
 	  Support for Sunplus SP7021 SoC. It is based on ARM 4-core
 	  Cortex-A7 with various peripherals (e.g.: I2C, SPI, SDIO,