linux-kernel - Re: [PATCH v1 0/3] serial:8250:Add driver support for MCHP PCI1XXXX UART module

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Date:   Tue, 5 Oct 2021 14:18:29 +0530
From:   LakshmiPraveen Kopparthi <LakshmiPraveen.Kopparthi@...rochip.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>,
        <macro@...am.me.uk>, <zev@...ilderbeest.net>, <vigneshr@...com>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH v1 0/3] serial:8250:Add driver support for MCHP PCI1XXXX
 UART module

On Wed, 2021-09-29 at 19:48 +0300, Andy Shevchenko wrote:
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> On Wed, Sep 29, 2021 at 05:00:46PM +0530, LakshmiPraveen Kopparthi
> wrote:
> > PCI1XXXX UART is a PCIe to UART module. It has 5 SKUs, each is
> > differentiated by the device IDs in the PCIe config space. Each
> > SKU supports a maximum of 4 UART ports(UART0,1,2,3) with fixed
> > offests.Based on the sub device ID, the combinations of UART
> > ports shall be enumerated.
> > 
> > The UART port is compatible with the standard 16550A, but has some
> > modifications.The modifications includes a change in the baud rate
> > settings,auto control of RTS signal for RS485 feature and an
> > increase of TX & RX FIFO size to 256 Bytes.Also, it has a
> > capability
> > to wake up the CPU.
> > 
> > These patches adds the support to enumerate and exercise all the
> > combinations of UART ports in all the SKUs.
> >  drivers/tty/serial/8250/8250_pci.c  | 384
> > ++++++++++++++++++++++++++++
> 
> Please, do not add this to 8250_pci.c. Use separate quirk driver as
> it's done
> in plenty of examples:
> 
>         8250_lpss.c, 8250_mid.c, 8250_exar.c, ...

Thanks for pointing the examples. I have looked into these examples and
the required functionality can be achieved with a separate driver. But
I would like to know the reason for not adding this to 8250_pci.c. 

> 
> --
> With Best Regards,
> Andy Shevchenko
> 
>