linux-kernel - Re: [PATCH v1 tty-next 1/2] 8250: microchip: pci1xxxx: Add driver for the quad-uart function in the multi-function endpoint of pci1xxxx device.

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Date:   Tue, 30 Aug 2022 21:58:14 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Ilpo Jarvinen <ilpo.jarvinen@...ux.intel.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Johan Hovold <johan@...nel.org>,
        wander@...hat.com, etremblay@...tech-controls.com,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Jeremy Kerr <jk@...abs.org>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Lukas Wunner <lukas@...ner.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH v1 tty-next 1/2] 8250: microchip: pci1xxxx: Add driver for
 the quad-uart function in the multi-function endpoint of pci1xxxx device.

Hi Kumaravel,

On Tue, Aug 30, 2022 at 8:01 PM Kumaravel Thiagarajan
<kumaravel.thiagarajan@...rochip.com> wrote:
> pci1xxxx is a PCIe switch with a multi-function endpoint on one of its
> downstream ports. Quad-uart is one of the functions in the
> multi-function endpoint. This driver loads for the quad-uart and
> enumerates single or multiple instances of uart based on the PCIe
> subsystem device ID.
>
> Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>

Thanks for your patch!

> --- /dev/null
> +++ b/drivers/tty/serial/8250/8250_pci1xxxx.c

> +static struct pci_driver pci1xxxx_pci_driver = {
> +       .name           = "pci1xxxx serial",
> +       .probe          = pci1xxxx_serial_probe,
> +       .remove = pci1xxxx_serial_remove,
> +       .id_table       = pci1xxxx_pci_tbl,
> +};
> +
> +module_pci_driver(pci1xxxx_pci_driver);

> --- a/drivers/tty/serial/8250/Kconfig
> +++ b/drivers/tty/serial/8250/Kconfig
> @@ -528,6 +528,15 @@ config SERIAL_8250_TEGRA
>           Select this option if you have machine with an NVIDIA Tegra SoC and
>           wish to enable 8250 serial driver for the Tegra serial interfaces.
>
> +config SERIAL_8250_PCI1XXXX
> +       tristate "Microchip 8250 based serial port"
> +       depends on SERIAL_8250

As this is a PCI driver, I guess it should depend on PCI
(|| COMPILE_TEST)?

> +       help
> +        Select this option if you have a setup with Microchip PCIe
> +        Switch with serial port enabled and wish to enable 8250
> +        serial driver for the serial interface. This driver support
> +        will ensure to support baud rates upto 1.5Mpbs.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds