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mmc: bcm2835_sdhci: Parse generic MMC device tree properties

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The bcm2835 SDHCI driver sets up the MMC host configuration via
sdhci_setup_cfg(), but does not parse generic MMC device tree
properties.

As a result, properties such as bus-width are ignored. On Raspberry Pi
Compute Module 4, the eMMC node describes an 8-bit bus, but U-Boot
initialized the device as 4-bit.

Call mmc_of_parse() before sdhci_setup_cfg() so that generic MMC
properties are folded into the host configuration before the MMC core
selects the bus width.

Before this change, mmc info reported:

    Bus Speed: 52000000
    Bus Width: 4-bit

After this change, mmc info reports:

    Bus Speed: 52000000
    Bus Width: 8-bit

Tested on Raspberry Pi Compute Module 4 with onboard eMMC.

Signed-off-by: Liel Harel <liel.harel@gmail.com>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com> # on the CM4 as well
This commit is contained in:
Liel Harel
2026-05-10 00:06:07 +03:00
committed by Peter Robinson
parent 17ceb774a1
commit 29c7796a71
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/bcm2835_sdhci.c
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@@ -219,6 +219,10 @@ static int bcm2835_sdhci_probe(struct udevice *dev)
host->mmc = &plat->mmc;
host->mmc->dev = dev;
ret = mmc_of_parse(dev, &plat->cfg);
if (ret)
return ret;
ret = sdhci_setup_cfg(&plat->cfg, host, emmc_freq, MIN_FREQ);
if (ret) {
debug("%s: Failed to setup SDHCI (err=%d)\n", __func__, ret);