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diff --git a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
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+* Toshiba Mobile IO SD/MMC controller
+
+The tmio-mmc driver doesn't probe its devices actively, instead its binding to
+devices is managed by either MFD drivers or by the sh_mobile_sdhi platform
+driver. Those drivers supply the tmio-mmc driver with platform data, that either
+describe hardware capabilities, known to them, or are obtained by them from
+their own platform data or from their DT information. In the latter case all
+compulsory and any optional properties, common to all SD/MMC drivers, as
+described in mmc.txt, can be used. Additionally the following tmio_mmc-specific
+optional bindings can be used.
+
+Required properties:
+- compatible:	"renesas,sdhi-shmobile" - a generic sh-mobile SDHI unit
+		"renesas,sdhi-sh7372" - SDHI IP on SH7372 SoC
+		"renesas,sdhi-sh73a0" - SDHI IP on SH73A0 SoC
+		"renesas,sdhi-r8a73a4" - SDHI IP on R8A73A4 SoC
+		"renesas,sdhi-r8a7740" - SDHI IP on R8A7740 SoC
+		"renesas,sdhi-r8a7778" - SDHI IP on R8A7778 SoC
+		"renesas,sdhi-r8a7779" - SDHI IP on R8A7779 SoC
+		"renesas,sdhi-r8a7790" - SDHI IP on R8A7790 SoC
+		"renesas,sdhi-r8a7791" - SDHI IP on R8A7791 SoC
+		"renesas,sdhi-r8a7792" - SDHI IP on R8A7792 SoC
+		"renesas,sdhi-r8a7793" - SDHI IP on R8A7793 SoC
+		"renesas,sdhi-r8a7794" - SDHI IP on R8A7794 SoC
+
+Optional properties:
+- toshiba,mmc-wrprotect-disable: write-protect detection is unavailable