[PATCH v2 2/3] dt-bindings: mmc: renesas_sdhi: add R-Car Gen[123] fallback compatibility strings

[Simon Horman]

Add fallback compatibility strings for R-Car Gen 1, 2 and 3.

In the case of Renesas R-Car hardware we know that there are generations of
SoCs, f.e. Gen 1 and 2. But beyond that its not clear what the relationship
between IP blocks might be. For example, I believe that r8a7790 is older
than r8a7791 but that doesn't imply that the latter is a descendant of the
former or vice versa.

We can, however, by examining the documentation and behaviour of the
hardware at run-time observe that the current driver implementation appears
to be compatible with the IP blocks on SoCs within a given generation.

For the above reasons and convenience when enabling new SoCs a
per-generation fallback compatibility string scheme being adopted for
drivers for Renesas SoCs.

Signed-off-by: Simon Horman <horms+renesas at verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas at glider.be>
---
 Documentation/devicetree/bindings/mmc/tmio_mmc.txt | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
index 53f8b5280ecd..8320ee5b7811 100644
--- a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
@@ -10,7 +10,7 @@ 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
+- compatible: should contain one or more of the following:
 		"renesas,sdhi-sh73a0" - SDHI IP on SH73A0 SoC
 		"renesas,sdhi-r7s72100" - SDHI IP on R7S72100 SoC
 		"renesas,sdhi-r8a73a4" - SDHI IP on R8A73A4 SoC
@@ -26,6 +26,16 @@ Required properties:
 		"renesas,sdhi-r8a7794" - SDHI IP on R8A7794 SoC
 		"renesas,sdhi-r8a7795" - SDHI IP on R8A7795 SoC
 		"renesas,sdhi-r8a7796" - SDHI IP on R8A7796 SoC
+		"renesas,sdhi-shmobile" - a generic sh-mobile SDHI controller
+		"renesas,rcar-gen1-sdhi" - a generic R-Car Gen1 SDHI controller
+		"renesas,rcar-gen2-sdhi" - a generic R-Car Gen2 or RZ/G1
+					   SDHI controller
+		"renesas,rcar-gen3-sdhi" - a generic R-Car Gen3 SDHI controller
+
+
+		When compatible with the generic version nodes must list
+		the SoC-specific version corresponding to the platform
+		first followed by the generic version.
 
 - clocks: Most controllers only have 1 clock source per channel. However, on
 	  some variations of this controller, the internal card detection
@@ -47,7 +57,7 @@ Optional properties:
 Example: R8A7790 (R-Car H2) SDHI controller nodes
 
 	sdhi0: sd at ee100000 {
-		compatible = "renesas,sdhi-r8a7790";
+		compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi";
 		reg = <0 0xee100000 0 0x328>;
 		interrupts = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp3_clks R8A7790_CLK_SDHI0>;
@@ -60,7 +70,7 @@ Example: R8A7790 (R-Car H2) SDHI controller nodes
 	};
 
 	sdhi1: sd at ee120000 {
-		compatible = "renesas,sdhi-r8a7790";
+		compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi";
 		reg = <0 0xee120000 0 0x328>;
 		interrupts = <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp3_clks R8A7790_CLK_SDHI1>;
@@ -73,7 +83,7 @@ Example: R8A7790 (R-Car H2) SDHI controller nodes
 	};
 
 	sdhi2: sd at ee140000 {
-		compatible = "renesas,sdhi-r8a7790";
+		compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi";
 		reg = <0 0xee140000 0 0x100>;
 		interrupts = <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp3_clks R8A7790_CLK_SDHI2>;
@@ -86,7 +96,7 @@ Example: R8A7790 (R-Car H2) SDHI controller nodes
 	};
 
 	sdhi3: sd at ee160000 {
-		compatible = "renesas,sdhi-r8a7790";
+		compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi";
 		reg = <0 0xee160000 0 0x100>;
 		interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&mstp3_clks R8A7790_CLK_SDHI3>;
-- 
2.11.0