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 ---
drivers/mmc/mmc-uclass.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c index 793196b..37ce922 100644 --- a/drivers/mmc/mmc-uclass.c +++ b/drivers/mmc/mmc-uclass.c @@ -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);