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Linux/AM3352: SDIO initialization issue

Part Number: AM3352

Tool/software: Linux

Can somebody tell me what would cause the following MMC related failures and where to look first to debug? ...

[    2.727433] omap_hsmmc 481d8000.mmc: using lookup tables for GPIO lookup

[    2.727467] omap_hsmmc 481d8000.mmc: lookup for GPIO cd failed

[    2.727492] omap_hsmmc 481d8000.mmc: GPIO lookup for consumer wp

[    2.727507] omap_hsmmc 481d8000.mmc: using device tree for GPIO lookup

[    2.727526] of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node '/ocp/mmc@481d8000[0]'

[    2.727546] of_get_named_gpiod_flags: can't parse 'wp-gpio' property of node '/ocp/mmc@481d8000[0]'

[    2.727561] omap_hsmmc 481d8000.mmc: using lookup tables for GPIO lookup

[    2.727581] omap_hsmmc 481d8000.mmc: lookup for GPIO wp failed

[    2.847548] ubi0: attaching mtd7

[    2.864882] omap_hsmmc 481d8000.mmc: no support for card's volts

[    2.871194] mmc1: error -22 whilst initialising SDIO card