linux-kernel - Re: [PATCH RFC 2/5] usb:cdns3: Add pci to platform driver wrapper

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Message-ID: <20200629114315.GA121549@kroah.com>
Date:   Mon, 29 Jun 2020 13:43:15 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "ben.dooks@...ethink.co.uk" <ben.dooks@...ethink.co.uk>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "rogerq@...com" <rogerq@...com>,
        "peter.chen@....com" <peter.chen@....com>,
        "weiyongjun1@...wei.com" <weiyongjun1@...wei.com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        "kurahul@...ene.com" <kurahul@...ene.com>,
        Sanket Parmar <sparmar@...ence.com>
Subject: Re: [PATCH RFC 2/5] usb:cdns3: Add pci to platform driver wrapper

On Mon, Jun 29, 2020 at 11:35:32AM +0000, Pawel Laszczak wrote:
> 
> >
> >On Fri, Jun 26, 2020 at 06:54:47AM +0200, Pawel Laszczak wrote:
> >> Patch adds PCI specific glue driver that creates and registers in-system
> >> cdns-usbssp platform device.
> >
> >Ick, no.
> >
> >Platform devices are ONLY to be used for when you have a real platform
> >device.  If your device is a PCI device, use that.  Don't try to be cute
> >and make a platform device when you don't have one please.
> >
> >> Thanks to that we will be able to use
> >> the cdns-usbssp platform driver for USBSS-DEV controller
> >> build on PCI board.
> >
> >No, fix up that driver to not care about it being a platform device,
> >make it just accept any type of 'struct device'.
> >
> Ok, I will remove it form this driver but probably in a few months I will have to add 
> such support.  

For a real platform device, that's fine, but that is not what you are
doing here.

thanks,

greg k-h