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dt-bindings: mmc: renesas_sdhi: add R-Car Gen[123] fallback compatibility strings

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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 <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Simon Horman 2017-10-18 09:00:22 +02:00 committed by Ulf Hansson
parent 95e91ade69
commit 54839d012d
1 changed files with 15 additions and 5 deletions
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20
Documentation/devicetree/bindings/mmc/tmio_mmc.txt
View File

@ -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 = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
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 = <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>;
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 = <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>;
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 = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&cpg CPG_MOD 311>;