On Sat, Nov 25, 2017 at 01:24:45AM +0900, Masahiro Yamada wrote:
> A card detect GPIO is set up only for platforms with "cd-gpios"
> DT property or TMIO_MMC_USE_GPIO_CD flag.  However, the driver
> core always uses mmc_gpio_get_cd, which just fails with -ENOSYS
> if ctx->cd_gpio is unset.
> 
> The bit 5 of the status register provides the current signal level
> of the CD line.  Allow to use it if the GPIO is unused.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

As mentioned before (sorry, I lost this thread :( ), I like the
refactoring to select in probe() which function to call depending on
GPIO usage or not. If you like, we can do the same for read_only, too.

Thanks!