[PATCH 1/2] mmc: stm32_sdmmc2: Add support for probing bus voltage level translator

Yann Gautier yann.gautier at foss.st.com
Mon Nov 15 13:41:45 CET 2021

On 11/13/21 3:29 AM, Marek Vasut wrote:
> Add support for testing whether bus voltage level translator is present
> and operational. This is useful on systems where the bus voltage level
> translator is optional, as the translator can be auto-detected by the
> driver and the feedback clock functionality can be disabled if it is
> not present.
> The translator test sets CMD high to avoid interfering with a card, and
> then verifies whether signal set on CK is detected on CKIN. If the signal
> is detected, translator is present, otherwise the CKIN feedback clock are
> disabled.
> Signed-off-by: Marek Vasut<marex at denx.de>
> Cc: Patrice Chotard<patrice.chotard at foss.st.com>
> Cc: Patrick Delaunay<patrick.delaunay at foss.st.com>

Hi Marek,

Reviewed-by: Yann Gautier <yann.gautier at foss.st.com>

Best regards,

More information about the U-Boot mailing list