On 5 February 2018 at 13:50, Kishon Vijay Abraham I [off-list ref] wrote:

DRA74x EVM Rev H EVM comes with revision 2.0 silicon. However, earlier
versions of EVM can come with either revision 1.1 or revision 1.0 of
silicon.

The device-tree file is written to support rev 2.0 of silicon.
pdata-quirks are used to then override the settings needed for
PG 1.1 silicon.

PG 1.1 silicon has limitations w.r.t frequencies at which MMC1/2/3
can operate as well as different IOdelay numbers.

I fail to understand the need for platform data. Why can't DT be used
for the older revisions as well?

Add support in sdhci-omap driver to get platform data if available
(added using pdata quirks) and override the data (max-frequency and
iodelay data) obtained from device tree.

[...]

Kind regards
Uffe