linux-kernel - Re: [PATCH RESEND v4 03/15] PCI: dwc: Convert to using native IP-core versions representation

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Message-ID: <20220728163428.GA309179@bhelgaas>
Date:   Thu, 28 Jul 2022 11:34:28 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rahul Tanwar <rtanwar@...linear.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH RESEND v4 03/15] PCI: dwc: Convert to using native
 IP-core versions representation

On Thu, Jul 28, 2022 at 04:31:17PM +0100, Ben Dooks wrote:
> On 28/07/2022 16:24, Bjorn Helgaas wrote:
> > On Fri, Jun 24, 2022 at 05:39:35PM +0300, Serge Semin wrote:
> > > Since DWC PCIe v4.70a the controller version can be read from the
> > > PORT_LOGIC.PCIE_VERSION_OFF register. Version is represented in the FourCC
> > > format [1]. It's standard versioning approach for the Synopsys DWC
> > > IP-cores. Moreover some of the DWC kernel drivers already make use of it
> > > to fixup version-dependent functionality (See DWC USB3, Stmicro STMMAC or
> > > recent DW SPI driver).
> > 
> > These references to other drivers might be useful, but without a
> > function name or file name, I can't easily find them.
> > 
> > > In order to preserve the standard version
> > > representation and prevent the data conversion back and forth, we suggest
> > > to preserve the native version representation in the DWC PCIe driver too
> > > in the same way as it has already been done in the rest of the DWC
> > > drivers. IP-core version reading from the CSR will be introduced in the
> > > next commit together with a simple macro-based API to use it.
> > > 
> > > [1] https://en.wikipedia.org/wiki/FourCC
> 
> I'm currently looking at a OF based dw-apb-timers-pwm driver, so also
> would like to follow this.

FWIW, the breadcrumbs I found are:

  dwc3_core_is_valid()
  stmmac_hwif_init()
  dw_spi_hw_init()