linux-kernel - Re: [PATCH v2 tty-next 1/3] 8250: microchip: pci1xxxx: Add driver for quad-uart support.

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Message-ID: <CAHp75VeS5oA6mOrmXGX2u=x1fL3ZqHZDURYHhA8J1hBpXm-KSQ@mail.gmail.com>
Date:   Tue, 4 Oct 2022 12:46:39 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        ilpo.jarvinen@...ux.intel.com, u.kleine-koenig@...gutronix.de,
        johan@...nel.org, wander@...hat.com,
        etremblay@...tech-controls.com, macro@...am.me.uk,
        geert+renesas@...der.be, jk@...abs.org, phil.edworthy@...esas.com,
        lukas@...ner.de, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 tty-next 1/3] 8250: microchip: pci1xxxx: Add driver for
 quad-uart support.

On Mon, Oct 3, 2022 at 10:36 PM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
> Le 01/10/2022 à 08:15, Kumaravel Thiagarajan a écrit :

...

> > +     if (pci_resource_flags(dev, 0) & IORESOURCE_MEM) {
> > +             if (!pcim_iomap(dev, 0, 0) && !pcim_iomap_table(dev))
> > +                     return -ENOMEM;
> > +
> > +             port->port.iotype = UPIO_MEM;
> > +             port->port.iobase = 0;
> > +             port->port.mapbase = pci_resource_start(dev, 0) + offset;
> > +             port->port.membase = pcim_iomap_table(dev)[0] + offset;

> Is it needed to call pcim_iomap_table(dev) twice? (here and a few lines
> above in the 'if')

Yes. But the main question I asked (if we really need IO ports
support) still remains.

> > +             port->port.regshift = 0;
> > +     } else {
> > +             port->port.iotype = UPIO_PORT;
> > +             port->port.iobase = pci_resource_start(dev, 0) + offset;
> > +             port->port.mapbase = 0;
> > +             port->port.membase = NULL;
> > +             port->port.regshift = 0;
> > +     }

-- 
With Best Regards,
Andy Shevchenko