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ata: sata_rcar: add gen[23] fallback compatibility strings 

Add fallback compatibility string for R-Car Gen 2 and 3.

In the case of Renesas R-Car hardware we know that there are generations of
SoCs, e.g. 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@verge.net.au>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Simon Horman 2017-07-11 13:44:20 +02:00 committed by Tejun Heo
parent ae86793700
commit 6ac1d1532c
2 changed files with 19 additions and 3 deletions
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14
Documentation/devicetree/bindings/ata/sata_rcar.txt
View File

@ -1,14 +1,22 @@
* Renesas R-Car SATA
Required properties:
- compatible : should contain one of the following:
- compatible : should contain one or more of the following:
- "renesas,sata-r8a7779" for R-Car H1
("renesas,rcar-sata" is deprecated)
- "renesas,sata-r8a7790-es1" for R-Car H2 ES1
- "renesas,sata-r8a7790" for R-Car H2 other than ES1
- "renesas,sata-r8a7791" for R-Car M2-W
- "renesas,sata-r8a7793" for R-Car M2-N
- "renesas,sata-r8a7795" for R-Car H3
- "renesas,rcar-gen2-sata" for a generic R-Car Gen2 compatible device
- "renesas,rcar-gen3-sata" for a generic R-Car Gen3 compatible device
- "renesas,rcar-sata" is deprecated
When compatible with the generic version nodes
must list the SoC-specific version corresponding
to the platform first followed by the generic
version.
- reg : address and length of the SATA registers;
- interrupts : must consist of one interrupt specifier.
- clocks : must contain a reference to the functional clock.
@ -16,7 +24,7 @@ Required properties:
Example:
sata0: sata@ee300000 {
compatible = "renesas,sata-r8a7791";
compatible = "renesas,sata-r8a7791", "renesas,rcar-gen2-sata";
reg = <0 0xee300000 0 0x2000>;
interrupt-parent = <&gic>;
interrupts = <0 105 IRQ_TYPE_LEVEL_HIGH>;

8
drivers/ata/sata_rcar.c
View File

@ -858,6 +858,14 @@ static const struct of_device_id sata_rcar_match[] = {
.compatible = "renesas,sata-r8a7795",
.data = (void *)RCAR_GEN2_SATA
},
{
.compatible = "renesas,rcar-gen2-sata",
.data = (void *)RCAR_GEN2_SATA
},
{
.compatible = "renesas,rcar-gen3-sata",
.data = (void *)RCAR_GEN2_SATA
},
{ },
};
MODULE_DEVICE_TABLE(of, sata_rcar_match);