linux-kernel - Re: [PATCH v2 1/3] dt-bindings: phy: cadence-torrent: Add latency properties

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Date:   Tue, 9 May 2023 16:57:00 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Christian Gmeiner <christian.gmeiner@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Dominic Rath <rath@...-augsburg.de>,
        krzysztof.kozlowski+dt@...aro.org, tjoseph@...ence.com,
        bhelgaas@...gle.com, lpieralisi@...nel.org, nm@...com,
        vigneshr@...com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        bahle@...-augsburg.de
Subject: Re: [PATCH v2 1/3] dt-bindings: phy: cadence-torrent: Add latency
 properties

On Tue, May 09, 2023 at 05:31:19PM +0200, Christian Gmeiner wrote:
> > On Thu, Apr 27, 2023 at 07:50:30AM +0200, Dominic Rath wrote:
> > > From: Alexander Bahle <bahle@...-augsburg.de>
> > >
> > > 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 */
> >
> > Are these things that could/should be described in a more generic
> > place?  They don't look necessarily Cadence-specific.
> 
> As there is currently no generic binding, would you like to see a new
> yaml binding
> added (Documentation/devicetree/bindings/phy/phy.yaml) that contains just the
> two phy properties?

The whole thing is more a question for Rob.

Bjorn