linux-kernel - Re: [PATCH 1/3] dt-bindings: PCI: cdns: Add PHY latency properties

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Message-ID: <20221013193219.GA3282648@bhelgaas>
Date:   Thu, 13 Oct 2022 14:32:19 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Dominic Rath <dominic.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,
        Alexander Bahle <bahle@...-augsburg.de>,
        Dominic Rath <rath@...-augsburg.de>
Subject: Re: [PATCH 1/3] dt-bindings: PCI: cdns: Add PHY latency properties

On Thu, Oct 13, 2022 at 02:12:49PM -0500, Rob Herring wrote:
> On Thu, Oct 13, 2022 at 08:26:47AM +0200, Dominic Rath wrote:
> > From: Alexander Bahle <bahle@...-augsburg.de>
> > 
> > Add "cdns,tx-phy-latency-ps" and "cdns,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.:
> > 
> >   max-link-speed = <2>;
> >   tx-phy-latency-ps = <100000 200000>; /* Gen1: 100ns, Gen2: 200ns */
> >   rx-phy-latency-ps = <150000 250000>; /* Gen1: 150ns, Gen2: 250ns */
> ... 

> If PTM is a standard PCIe thing, then I don't think these should be 
> Cadence specific. IOW, drop 'cdns'. 

PTM is definitely a standard PCIe thing.  I had the same question.