Hi Simon,
On Tue, Mar 8, 2016 at 2:33 AM, Simon Horman <horms@xxxxxxxxxxxx> wrote:
> On Tue, Mar 08, 2016 at 10:30:42AM +0900, Simon Horman wrote:
>> Add fallback compatibility string for R-Car Gen 1, 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 r8a7779 is older
>> than r8a7778 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@xxxxxxxxxxxx>
>> ---
>> Based on libata/for-next
>> ---
>> Documentation/devicetree/bindings/ata/sata_rcar.txt | 15 ++++++++++++---
>> drivers/ata/sata_rcar.c | 12 ++++++++++++
>> 2 files changed, 24 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/ata/sata_rcar.txt b/Documentation/devicetree/bindings/ata/sata_rcar.txt
>> index 0764f9ab63dc..b44048176938 100644
>> --- a/Documentation/devicetree/bindings/ata/sata_rcar.txt
>> +++ b/Documentation/devicetree/bindings/ata/sata_rcar.txt
>> @@ -1,14 +1,23 @@
>> * 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-gen1-sata" for a generic R-Car Gen1 compatible device
Given R-Car H1 is the only member of the R-Car Gen1 family that has SATA
(both M1A and E1 don't seem to have it), do we want to support
"renesas,rcar-gen1-sata" in the bindings...
>> + - "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
>> --- a/drivers/ata/sata_rcar.c
>> +++ b/drivers/ata/sata_rcar.c
>> @@ -858,6 +858,18 @@ static struct of_device_id sata_rcar_match[] = {
>> .compatible = "renesas,sata-r8a7795",
>> .data = (void *)RCAR_GEN2_SATA
>> },
>> + {
>> + .compatible = "renesas,rcar-gen1-sata",
>> + .data = (void *)RCAR_GEN1_SATA
>> + },
... and in the driver?
It already matches on (deprecated) "renesas,rcar-sata" and
"renesas,sata-r8a7779"?
>> + {
>> + .compatible = "renesas,rcar-gen2-sata",
>> + .data = (void *)RCAR_GEN2_SATA
>> + },
>> + {
>> + .compatible = "renesas,rcar-gen3-sata",
>> + .data = (void *)RCAR_GEN2_SATA
>> + },
>> { },
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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