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mmc: do not overwrite cfg->f_max if "max-frequency" if missing

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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>
This commit is contained in:
Masahiro Yamada 2017-12-30 02:00:06 +09:00 committed by Jaehoon Chung
parent 3ab48f6223
commit c42ee367fd
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/mmc-uclass.c
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@ -146,7 +146,8 @@ int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg)
break;
}
cfg->f_max = dev_read_u32_default(dev, "max-frequency", 52000000);
/* f_max is obtained from the optional "max-frequency" property */
dev_read_u32(dev, "max-frequency", &cfg->f_max);
if (dev_read_bool(dev, "cap-sd-highspeed"))
cfg->host_caps |= MMC_CAP(SD_HS);