linux-kernel - Re: [PATCH 6/6] staging: mt7621-pci: properly adjust base address for the IO window

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Date:   Sat, 25 Sep 2021 19:33:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Liviu Dudau <Liviu.Dudau@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        gregkh <gregkh@...uxfoundation.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-staging@...ts.linux.dev, neil@...wn.name,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] staging: mt7621-pci: properly adjust base address for
 the IO window

On Fri, Sep 24, 2021 at 11:11 PM Sergio Paracuellos
<sergio.paracuellos@...il.com> wrote:
>
> The value to adjust in the bridge register RALINK_PCI_IOBASE must take into
> account the raw value from DT, not only the translated linux port number.
> As long as io_offset is zero, the two are the same, but if you were to use
> multiple host bridge in the system, or pick a different bus address in DT,
> you can have a nonzero io_offset. At this means to take into account the
> bus address which is used to calculate this offset, substracting it from
> the IO resource start address.
>
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>

Acked-by: Arnd Bergmann <arnd@...db.de>