diff options
| author | Tanmay Kathpalia <[email protected]> | 2025-12-03 04:21:32 -0800 |
|---|---|---|
| committer | Peng Fan <[email protected]> | 2025-12-11 20:53:50 +0800 |
| commit | aebb523a23818a8ee4199c9532b51e3d4020696f (patch) | |
| tree | 28a575b2cd758b6ce2b4137f0bda7f8e5c2b8e2d | |
| parent | b033255a5795cc2d88f761c856d6e8e354267582 (diff) | |
mmc: mmc-uclass: Use max-frequency from device tree with default handling
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 <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Signed-off-by: Peng Fan <[email protected]>
| -rw-r--r-- | drivers/mmc/mmc-uclass.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c index 2f4dc5bd887..bf0bea93853 100644 --- a/drivers/mmc/mmc-uclass.c +++ b/drivers/mmc/mmc-uclass.c @@ -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); |