serial: max310x: fix compile errors if CONFIG_SPI_MASTER is disabled

Since commit 20ffe4b3330a8 ("serial: max310x: allow driver to be built with
SPI or I2C"), if I2C is enabled and SPI_MASTER is disabled, we have these
compile errors:

  drivers/tty/serial/max310x.c: In function 'max310x_uart_init':
  drivers/tty/serial/max310x.c: error: 'max310x_spi_driver' undeclared...
  drivers/tty/serial/max310x.c: In function ‘max310x_uart_init’:
  drivers/tty/serial/max310x.c: error: label ‘err_spi_register’
  defined but not used...
  drivers/tty/serial/max310x.c: error: ‘regcfg’ defined but not used

Fix by properly encapsulating i2c/spi code/variables in their respective
context with IS_ENABLED() macros for CONFIG_I2C and CONFIG_SPI_MASTER.

Also fix link failure with SERIAL_MAX310X=y and I2C=m by modifying Kconfig
depends.

Fixes: 20ffe4b3330a8 ("serial: max310x: allow driver to be built with SPI or I2C")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202605121847.N9DVLNg2-lkp@intel.com/
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://patch.msgid.link/20260521153333.2336642-1-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions