On Thu, Mar 03, 2016 at 09:38:37AM +0900, Simon Horman wrote:
> In the case of Renesas R-Car hardware we know that there are generations of
> SoCs, e.g. Gen 2 and Gen 3. 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@xxxxxxxxxxxx>
> ---
> v2
> * Use renesas,rcar-gen2-usb-phy rather than renesas,usb-phy-gen2 as
> the new compatibility string to fit in with the preferred scheme
> for new compatibility string names.
> ---
> Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt | 8 +++++++-
> drivers/phy/phy-rcar-gen2.c | 1 +
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt b/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
> index d564ba4f1cf6..feb1c3c102c2 100644
> --- a/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt
> @@ -7,6 +7,12 @@ Required properties:
> - compatible: "renesas,usb-phy-r8a7790" if the device is a part of R8A7790 SoC.
> "renesas,usb-phy-r8a7791" if the device is a part of R8A7791 SoC.
> "renesas,usb-phy-r8a7794" if the device is a part of R8A7794 SoC.
> + "renesas,rcar-gen2-usb-phy" for a generic R-Car Gen2 compatible device.
> +
> + When compatible with the generic version, nodes must list the
> + SoC-specific version corresponding to the platform first
> + followed by the generic version.
> +
> - reg: offset and length of the register block.
> - #address-cells: number of address cells for the USB channel subnodes, must
> be <1>.
> @@ -34,7 +40,7 @@ the USB channel; see the selector meanings below:
> Example (Lager board):
>
> usb-phy@e6590100 {
> - compatible = "renesas,usb-phy-r8a7790";
> + compatible = "renesas,usb-phy-r8a7790","renesas,rcar-gen2-usb-phy";
Space here ^
Otherwise,
Acked-by: Rob Herring <robh@xxxxxxxxxx>
