Commit 0dfa61bb authored by Simon Horman's avatar Simon Horman Committed by Marc Kleine-Budde

can: rcar: add gen[12] fallback compatibility strings

Add fallback compatibility string for R-Car Gen 1 and Gen2.

In the case of Renesas R-Car hardware we know that there are generations of
SoCs, e.g. Gen 1 and Gen 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: default avatarSimon Horman <horms+renesas@verge.net.au>
Acked-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 59097ac9
......@@ -6,6 +6,12 @@ Required properties:
"renesas,can-r8a7779" if CAN controller is a part of R8A7779 SoC.
"renesas,can-r8a7790" if CAN controller is a part of R8A7790 SoC.
"renesas,can-r8a7791" if CAN controller is a part of R8A7791 SoC.
"renesas,rcar-gen1-can" for a generic R-Car Gen1 compatible device.
"renesas,rcar-gen2-can" 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: physical base address and size of the R-Car CAN register map.
- interrupts: interrupt specifier for the sole interrupt.
- clocks: phandles and clock specifiers for 3 CAN clock inputs.
......@@ -25,7 +31,7 @@ Example
SoC common .dtsi file:
can0: can@e6e80000 {
compatible = "renesas,can-r8a7791";
compatible = "renesas,can-r8a7791", "renesas,rcar-gen2-can";
reg = <0 0xe6e80000 0 0x1000>;
interrupts = <0 186 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&mstp9_clks R8A7791_CLK_RCAN0>,
......
......@@ -904,6 +904,8 @@ static const struct of_device_id rcar_can_of_table[] __maybe_unused = {
{ .compatible = "renesas,can-r8a7779" },
{ .compatible = "renesas,can-r8a7790" },
{ .compatible = "renesas,can-r8a7791" },
{ .compatible = "renesas,rcar-gen1-can" },
{ .compatible = "renesas,rcar-gen2-can" },
{ }
};
MODULE_DEVICE_TABLE(of, rcar_can_of_table);
......
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