On 22/10/2015 16:02, Mans Rullgard wrote:
> This adds a binding for the Aurora VLSI NB8800 Ethernet controller
> using the "aurora,nb8800" compatible string. When used in Sigma
> Designs chips a few additional control registers are available.
> This variant is indicated by the "sigma,smp8640-ethernet" compatible
> string.
>
> Signed-off-by: Mans Rullgard <mans@xxxxxxxxx>
> ---
> .../devicetree/bindings/net/aurora,nb8800.txt | 26 ++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/aurora,nb8800.txt
>
> diff --git a/Documentation/devicetree/bindings/net/aurora,nb8800.txt b/Documentation/devicetree/bindings/net/aurora,nb8800.txt
> new file mode 100644
> index 0000000..c19f615
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/aurora,nb8800.txt
> @@ -0,0 +1,26 @@
> +* Aurora VLSI AU-NB8800 Ethernet controller
> +
> +Required properties:
> +- compatible: Should be "aurora,nb8800", "sigma,smp8640-ethernet"
> + The latter indicates presence of extra features added by Sigma Designs.
I've been meaning to ask a noob question to the devicetree group
about how names for compatible strings are chosen.
Sigma Designs has two active SoC families, Tango3 (which consists of
about a dozen MIPS-based SoCs, typically named SMP86xx) and Tango4
(a few ARM-based SoCs, typically named SMP87xx). I should note that
there is no SMP8640 SoC AFAIK, rather SMP864x is a Tango3 sub-family
(I could locate 42,43,44,45,46).
AFAIK, all our SoCs are using the same Aurora NB8800 Ethernet MAC,
along with the extra features. I find it odd to use a specific SoC
model to refer to this device, instead of a more generic name.
(It's weird having to mention smp8640 in the tango4 DT.)
Would it be possible to have a compatible string which makes it
clear that it is an Aurora MAC with vendor-specific tweaks?
Something like "sigma,aurora-nb8800-mac" ?
> +- reg: Should be MMIO address space of the device
> +- interrupts: Should contain the interrupt specifier for the device
> +- interrupt-parent: Should be a phandle for the interrupt controller
> +- clocks: Should be a phandle for the clock for the device
> +
> +Common properties described in ethernet.txt:
> +- local-mac-address
> +- mac-address
> +- max-speed
> +- phy-mode
> +
> +Example:
> +
> +ethernet@26000 {
> + compatible = "aurora,nb8800";
> + reg = <0x10000 0x800>;
> + interrupts = <42>;
I thought one had to specify also whether the device sent "edge"
or "level" IRQs?
> + clocks = <&sys_clk>;
> + max-speed = <1000>;
> + phy-connection-type = "rgmii";
> +};
Regards.
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