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To use a GPIO line for card detection, TMIO_MMC_USE_GPIO_CD is set by a legacy board (arch/sh/boards/mach-ecovec24). For DT platforms, the "cd-gpios" property is a legitimate way for that in case the IP-builtin card detection can not be used for some reason. mmc_of_parse() calls mmc_gpiod_request_cd() to set up ctx->cd_gpio if the "cd-gpios" property is specified. To cater to both cases, mmc_can_gpio_cd() is a correct way to check which card detection logic is used. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.