The current implementation uses both, host and card capabilites to derive
the maximum bus width to be used. However, in cases where a MMC device is
not connected to the host via shdc using the full bus width of 8 lines,
device initialization fails. Introducing the `bus-width` property
circumvents this by reducing the host bus capabilites and forcing
communication with the MMC device using 1, 4 or 8 lines.
Signed-off-by: Mourad Kharrazi <mourad.kharrazi@ithinx.io>
- Adds mmc.c
- Edits sd.c to init and probe MMC
- Adds mmc init to sd_init
- Some functions from sdmmc.c should be in sd_ops because
they can be used by both sdmmc and mmc.
Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
