linux-kernel - Re: [PATCH v5 2/2] serial:sunplus-uart:Add Sunplus SoC UART Driver

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Date:   Fri, 24 Dec 2021 17:05:14 +0800
From:   hammer hsieh <hammerh0314@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     robh+dt@...nel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        jirislaby@...nel.org, p.zabel@...gutronix.de, wells.lu@...plus.com,
        Hammer Hsieh <hammer.hsieh@...plus.com>
Subject: Re: [PATCH v5 2/2] serial:sunplus-uart:Add Sunplus SoC UART Driver

Hi, Greg KH:

8250 driver means create driver in drivers/tty/8250/ ?
and current I create driver in drivers/tty/serial/ not correct ?

Regards,
Hammer Hsieh

Greg KH <gregkh@...uxfoundation.org> 於 2021年12月24日 週五 下午4:59寫道：
>
> On Fri, Dec 24, 2021 at 03:16:55PM +0800, hammer hsieh wrote:
> > Hi, Greg KH :
> >
> > In patch v1 coding quite mess, it is almost 2000 LOCs.
> > For down size code under 1000 LOCs, I decide to drop DMA function code
> > after patch v3.
> > I think that's the biggest difference compared with 8250.
> > Without DMA function, like you said it looks like 8250 variant.
> > I think I should put DMA function back in next submit.
>
> The 8250 driver handles DMA just fine today, why is your chip doing it
> differently?  Are you sure it is a different chip?  Who created a new
> uart chip these days?
>
> > Another question for why I need PORT_SLUNPLUS ?
> > I just check many other uart driver, almost all driver define their
> > own PORT number.
> > Actually, I didn't know about it.
> > Maybe some device like bluetooth(use uart port) need autoconfig.
> > Then it will call ioctl with TIOCSERCONFIG.
> > I don't have tool for calling type/config/request/release/verify.
>
> If you do not need it, and you can not test for it, please do not add
> it.
>
> thanks,
>
> greg k-h