mirrors/u-boot
1
0
Fork 0
mirror of https://source.denx.de/u-boot/u-boot.git synced 2025-12-17 07:21:36 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

mmc: mmc-uclass: Use max-frequency from device tree with default handling

Browse Source 
When the max-frequency property is not specified in the device tree,
the function now explicitly defaults to 0 instead of leaving cfg->f_max
uninitialized. This allows sdhci_setup_cfg() to properly detect the
absence of a device tree specified frequency and fall back to using
the host controller's maximum base clock frequency from the capabilities
register.

Signed-off-by: Tanmay Kathpalia <tanmay.kathpalia@altera.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Tanmay Kathpalia 2025-12-03 04:21:32 -08:00 committed by Peng Fan
parent b033255a57
commit aebb523a23
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/mmc/mmc-uclass.c
View File

@ -243,8 +243,13 @@ int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg)
return -EINVAL;
}
/* f_max is obtained from the optional "max-frequency" property */
dev_read_u32(dev, "max-frequency", &cfg->f_max);
/*
* Maximum frequency is obtained from the optional "max-frequency" property.
* If not specified in device tree, defaults to 0 and sdhci_setup_cfg()
* will set the MMC configuration maximum frequency to the host controller's
* maximum base clock frequency from capabilities register.
*/
cfg->f_max = dev_read_u32_default(dev, "max-frequency", 0);
if (dev_read_bool(dev, "cap-sd-highspeed"))
cfg->host_caps |= MMC_CAP(SD_HS);