On Sun, Oct 07, 2018 at 10:38:23AM -0700, Richard Cochran wrote:
> The InES at the ZHAW offers a PTP time stamping IP core. The FPGA
> logic recognizes and time stamps PTP frames on the MII bus. This
> patch adds a driver for the core along with a device tree binding to
> allow hooking the driver to MII buses.
>
> Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
> ---
> Documentation/devicetree/bindings/ptp/ptp-ines.txt | 37 +
Bindings should be separate patch.
> drivers/ptp/Kconfig | 10 +
> drivers/ptp/Makefile | 1 +
> drivers/ptp/ptp_ines.c | 870
> +++++++++++++++++++++
> 4 files changed, 918 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/ptp/ptp-ines.txt
> create mode 100644 drivers/ptp/ptp_ines.c
>
> diff --git a/Documentation/devicetree/bindings/ptp/ptp-ines.txt
> b/Documentation/devicetree/bindings/ptp/ptp-ines.txt
> new file mode 100644
> index 000000000000..1484b62802c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ptp/ptp-ines.txt
> @@ -0,0 +1,37 @@
> +ZHAW InES PTP time stamping IP core
> +
> +The IP core needs two different kinds of nodes. The control node
> +lives somewhere in the memory map and specifies the address of the
> +control registers. There can be up to three port handles placed as
> +attributes of PHY nodes. These associate a particular MII bus with a
> +port index within the IP core.
> +
> +Required properties of the control node:
> +
> +- compatible: "ines,ptp-ctrl"
ines is not registered vendor prefix. Should it be 'zhaw' instead?
> +- reg: physical address and size of the register bank
> +- #phandle-cells: must be one (1)
#timestamper-cells
Or if it is always 1, you could omit it.
> +
> +Required format of the port handle within the PHY node:
> +
> +- timestamper: provides control node reference and
> + the port channel within the IP core
This and #timestamper-cells need to be in a common binding doc.
And bonus points if you add a check in dtc for this. Should be a
one-liner.
> +
> +Example:
> +
> + tstamper: timestamper@60000000 {
> + compatible = "ines,ptp-ctrl";
> + reg = <0x60000000 0x80>;
> + #phandle-cells = <1>;
> + };
> +
> + ethernet@80000000 {
> + ...
> + mdio {
> + ...
> + phy@3 {
> + ...
> + timestamper = <&tstamper 0>;
> + };
> + };
> + };
