>
> From: Alexander Bahle <bahle@xxxxxxxxxxxxxxx>
>
> Add "tx-phy-latency-ps" and "rx-phy-latency-ps" DT bindings for
> setting the PCIe PHY latencies.
> The properties expect a list of uint32 PHY latencies in picoseconds for
> every supported speed starting at PCIe Gen1, e.g.:
>
> tx-phy-latency-ps = <100000 200000>; /* Gen1: 100ns, Gen2: 200ns */
> rx-phy-latency-ps = <150000 250000>; /* Gen1: 150ns, Gen2: 250ns */
>
> Signed-off-by: Alexander Bahle <bahle@xxxxxxxxxxxxxxx>
> Signed-off-by: Dominic Rath <rath@xxxxxxxxxxxxxxx>
Reviewed-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
> ---
> .../bindings/phy/phy-cadence-torrent.yaml | 20 +++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
> index 2ad1faadda2a..93228a304395 100644
> --- a/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
> +++ b/Documentation/devicetree/bindings/phy/phy-cadence-torrent.yaml
> @@ -126,6 +126,24 @@ patternProperties:
> enum: [2160, 2430, 2700, 3240, 4320, 5400, 8100]
> default: 8100
>
> + tx-phy-latency-ps:
> + description:
> + The PHY latencies for the TX direction applied to PCIe PTM timestamps. Most
> + PCIe PHYs have asynchronous latencies for their RX and TX paths. To obtain
> + accurate PTM timestamps, the PCIe PTM specification requires that the time
> + at which the first serial bit is present on the serial lines be taken.
> + Should contain picosecond latency values for each supported speed,
> + starting with Gen1 latency.
> +
> + rx-phy-latency-ps:
> + description:
> + The PHY latencies for the RX direction applied to the PTM timestamps. Most
> + PCIe PHYs have asynchronous latencies for their RX and TX paths. To obtain
> + accurate PTM timestamps, the PCIe PTM specification requires that the time
> + at which the first serial bit is present on the serial lines be taken.
> + Should contain picosecond latency values for each supported speed,
> + starting with Gen1 latency.
> +
> required:
> - reg
> - resets
> @@ -203,6 +221,8 @@ examples:
> cdns,phy-type = <PHY_TYPE_PCIE>;
> cdns,num-lanes = <2>;
> cdns,ssc-mode = <CDNS_SERDES_NO_SSC>;
> + tx-phy-latency-ps = <138800 69400>;
> + rx-phy-latency-ps = <185200 92600>;
> };
>
> phy@2 {
> --
> 2.36.0
>
--
greets
--
Christian Gmeiner, MSc
https://christian-gmeiner.info/privacypolicy
