From 54839d012d5f98cde2fa102fdcd22e1da661d138 Mon Sep 17 00:00:00 2001 From: Simon Horman Date: Wed, 18 Oct 2017 09:00:22 +0200 Subject: dt-bindings: mmc: renesas_sdhi: add R-Car Gen[123] fallback compatibility strings 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 is being adopted for drivers for Renesas SoCs. Signed-off-by: Simon Horman Reviewed-by: Geert Uytterhoeven Acked-by: Wolfram Sang Signed-off-by: Ulf Hansson --- Documentation/devicetree/bindings/mmc/tmio_mmc.txt | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) (limited to 'Documentation/devicetree/bindings/mmc/tmio_mmc.txt') diff --git a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt index b63392d9cc47..3c6762430fd9 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@ee100000 { - compatible = "renesas,sdhi-r8a7790"; + compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi"; reg = <0 0xee100000 0 0x328>; interrupts = ; clocks = <&cpg CPG_MOD 314>; @@ -61,7 +71,7 @@ Example: R8A7790 (R-Car H2) SDHI controller nodes }; sdhi1: sd@ee120000 { - compatible = "renesas,sdhi-r8a7790"; + compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi"; reg = <0 0xee120000 0 0x328>; interrupts = ; clocks = <&cpg CPG_MOD 313>; @@ -75,7 +85,7 @@ Example: R8A7790 (R-Car H2) SDHI controller nodes }; sdhi2: sd@ee140000 { - compatible = "renesas,sdhi-r8a7790"; + compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi"; reg = <0 0xee140000 0 0x100>; interrupts = ; clocks = <&cpg CPG_MOD 312>; @@ -89,7 +99,7 @@ Example: R8A7790 (R-Car H2) SDHI controller nodes }; sdhi3: sd@ee160000 { - compatible = "renesas,sdhi-r8a7790"; + compatible = "renesas,sdhi-r8a7790", "renesas,rcar-gen2-sdhi"; reg = <0 0xee160000 0 0x100>; interrupts = ; clocks = <&cpg CPG_MOD 311>; -- cgit