mmc_of_parse() in U-Boot is a pussy helper; it sets cfg->f_max to 52MHz even if DT does not provide "max-frequency" at all. This can overwrite cfg->f_max that may have been set to a reasonable default. As the DT binding says, "max-frequency" is an optional property. Do nothing if DT does not specify it. This is the behavior of mmc_of_parse() in Linux. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>master
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