linux-kernel - Re: [PATCH 02/10] i2c: pasemi: Use io{read,write}32

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Message-ID: <CAK8P3a2_6rcQa8TCgw=6uH26UfjShrVVu-zfLf2=pi6Z8cGOPg@mail.gmail.com>
Date:   Mon, 27 Sep 2021 09:39:31 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        Hector Martin <marcan@...can.st>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/10] i2c: pasemi: Use io{read,write}32

On Sun, Sep 26, 2021 at 12:00 PM Sven Peter <sven@...npeter.dev> wrote:
>
> In preparation for splitting this driver up into a platform_driver
> and a pci_driver, replace outl/inl usage with ioport_map and
> ioread32/iowrite32.
>
> Signed-off-by: Sven Peter <sven@...npeter.dev>
>
> +       smbus->ioaddr = ioport_map(smbus->base, smbus->size);
> +       if (!smbus->ioaddr) {
> +               error = -EBUSY;
> +               goto out_release_region;
> +       }

While this works, I would suggest using the more regular pci_iomap()
or pcim_iomap() helper to turn the port number into an __iomem token.

        Arnd