From 29c7796a718977ac78da7d381daec9828ec8c995 Mon Sep 17 00:00:00 2001 From: Liel Harel Date: Sun, 10 May 2026 00:06:07 +0300 Subject: [PATCH] mmc: bcm2835_sdhci: Parse generic MMC device tree properties 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 Reviewed-by: Peter Robinson Tested-by: Peter Robinson # on the CM4 as well --- drivers/mmc/bcm2835_sdhci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/bcm2835_sdhci.c b/drivers/mmc/bcm2835_sdhci.c index 655d9902dfa..efa4d14f5da 100644 --- a/drivers/mmc/bcm2835_sdhci.c +++ b/drivers/mmc/bcm2835_sdhci.c @@ -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);