u-boot/board/compulab/cm_t54
Igor Grinberg 0b03a931ab omap: hsmmc: assume cd gpio is active low
Switch the default CD GPIO polarity to active low.

The current hsmmc driver assumption that the CD GPIO is active high, but
in the real hardware, usually the opposite holds.
The usual SD card socket has a mechanical switch which is grounded as
soon as a card is inserted.
Of course there might be some board logic which inverts the signal, but
as far as current users are concerned, there is no such logic.

Current U-Boot users either not using the CD functionality, or have a
different way (e.g. external to SoC GPIO controller) for checking the
card presence.

This patch also brings the polarity assumption in line with the Linux
kernel and adds appropriate comments.

This patch also might spare issues once the TWL GPIO driver will be
converted to the DM.

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: Dmitry Lifshitz <lifshitz@compulab.co.il>
Reviewed-by: Tom Rini <trini@ti.com>
2014-11-06 11:04:41 -05:00
..
cm_t54.c omap: hsmmc: assume cd gpio is active low 2014-11-06 11:04:41 -05:00
Kconfig kconfig: remove redundant "string" type in arch and board Kconfigs 2014-09-13 16:43:55 -04:00
MAINTAINERS Add board MAINTAINERS files 2014-07-30 08:48:06 -04:00
Makefile cm-t54: add cm-t54 board support 2014-05-23 19:40:39 -04:00
mux.c cm-t54: add cm-t54 board support 2014-05-23 19:40:39 -04:00
spl.c cm-t54: add cm-t54 board support 2014-05-23 19:40:39 -04:00