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

[Ben Dooks]

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.

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

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