On Tue, Dec 13, 2016 at 06:48:35PM +0100, Gregory CLEMENT wrote:

+Optional Properties:
+- mmc-card:
+  mmc-card child node must be provided when current SDHC is for eMMC.
+  Xenon SDHC often can support both SD and eMMC. This child node indicates that
+  current SDHC is for eMMC card. Thus Xenon eMMC specific configuration and
+  operations can be enabled prior to eMMC init sequence.
+  Please refer to Documentation/devicetree/bindings/mmc/mmc-card.txt.
+  This child node should not be set if current Xenon SDHC is for SD/SDIO.

This looks like a typo - shouldn't it be "mmccard" and not "mmc-card"?
Your examples below use "mmccard" as does the documentation you point
towards.

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