[PATCH v2 0/4] mmc: sdhci-esdhc-imx: add 1-bit bus width support

ziniu.wang_1
2026-03-03T10:48:08Z

From: Luke Wang <ziniu.wang_1@nxp.com>

This series adds 1-bit bus width support for sdhci-esdhc-imx driver.

Currently sdhci-esdhc-imx doesn't support 1-bit width because it
doesn't call sdhci_get_property() to parse "bus-width = <1>" and
set SDHCI_QUIRK_FORCE_1_BIT_DATA quirk.

After adding sdhci_get_property(), another issue is exposed:
mmc_select_hs200() returns 0 without switching when 1-bit bus is
used, causing mmc_select_timing() to skip mmc_select_hs(). This
leaves eMMC in legacy mode (26MHz) instead of High Speed (52MHz).

Fix by dropping incompatible UHS/DDR/HS200/HS400 caps in
sdhci_setup_host() for 1-bit width, and clean up duplicate code now
handled by common framework.

Luke Wang (4):
mmc: sdhci: fix timing selection for 1-bit bus width
mmc: sdhci-esdhc-imx: add 1-bit bus width support
mmc: sdhci-esdhc-imx: remove duplicate HS400 bus width validation
mmc: sdhci-pltfm: remove duplicate DTS property parsing
---
Changes in v2:
- Moved fix from mmc_validate_host_caps() to sdhci_setup_host()
---
drivers/mmc/host/sdhci-esdhc-imx.c | 6 +-----
drivers/mmc/host/sdhci-pltfm.c | 7 -------
drivers/mmc/host/sdhci.c | 8 +++++++-
3 files changed, 8 insertions(+), 13 deletions(-)

--
2.34.1