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

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Message-ID: <0d644682-094d-6151-aa2f-86552c8f9a87@codethink.co.uk>
Date:   Thu, 28 Jul 2022 16:31:17 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     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 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.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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