• Thomas Petazzoni's avatar
    mmc: sdhci: use WP GPIO in sdhci_check_ro() · 6d5cd068
    Thomas Petazzoni authored
    Even though SDHCI controllers may have a dedicated WP pin that can be
    queried using the SDHCI_PRESENT_STATE register, some platforms may
    chose to use a separate regular GPIO to route the WP signal. Such a
    GPIO is typically represented using the wp-gpios property in the
    Device Tree.
    Unfortunately, the current sdhci_check_ro() function does not make use
    of such GPIO when available: it either uses a host controller specific
    ->get_ro() operation, or uses the SDHCI_PRESENT_STATE. Several host
    controller specific ->get_ro() functions are implemented just to check
    a WP GPIO state.
    Instead of pushing this to more controller-specific implementations,
    let's handle this in the core SDHCI code, just like it is already done
    for the CD GPIO in sdhci_get_cd().
    The below patch simply changes sdhci_check_ro() to use the value of
    the WP GPIO if available.
    Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@bootlin.com>
    Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
    Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>