linux-kernel - Re: [PATCH 4/5] sprd_serial: switch comptible string to sc-uart

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Date:   Fri, 17 Feb 2017 15:35:11 +0800
From:   Chunyan Zhang <chunyan.zhang@...eadtrum.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     <linux-arm-kernel@...ts.infradead.org>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <gregkh@...uxfoundation.org>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <orson.zhai@...eadtrum.com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/5] sprd_serial: switch comptible string to sc-uart

On 四,  2月 16, 2017 at 02:31:38下午 +0100, Arnd Bergmann wrote:
> On Tuesday, February 14, 2017 5:19:11 PM CET Chunyan Zhang wrote:
> >  static const struct of_device_id serial_ids[] = {
> > -       {.compatible = "sprd,sc9836-uart",},
> > +       {.compatible = "sprd,sc-uart",},
> >         {}
> 
> We really need this to be specific, in case Spreadtrum ever
> makes a slightly different UART that is not 100% compatible
> with this one. Also, you can't remove the string you already have,
> only add to it.
>
> Normally when you have a new chip that is compatible with one
> we already have a driver for, we mark the device as compatible
> with the old one and avoid having to change the driver, e.g.
> 
> 	compatible = "sprd,sc9995-uart", "sprd,sc9836-uart";
> 
> This way, the driver could later be changed to handle anything
> that is compatible with sc9995 differently from sc9836, but
> by default it would match the original string.
> 

Right, I've addressed this when I received the same comments from
Rob Herring :)

Thanks for your comments,
Chunyan
 
> 	Arnd