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>

diff --git a/Documentation/devicetree/bindings/ata/sata_rcar.txt b/Documentation/devicetree/bindings/ata/sata_rcar.txt
index 0764f9ab63dcde31f7efff01f74e56c5c6fa1c56..e20eac7a30874f0db82adefa0cdf3a77ac09aec2 100644 (file)
--- a/Documentation/devicetree/bindings/ata/sata_rcar.txt
+++ b/Documentation/devicetree/bindings/ata/sata_rcar.txt
@@ -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>;

diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index ee98447587366f240a580e56a49e0983f58727e2..537d11869069aae7d26e1e253ed3f4d587d25bbf 100644 (file)
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -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);