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Message-ID: <20230227205446.udsl5tbnzzo4dhi4@pengutronix.de>
Date: Mon, 27 Feb 2023 21:54:46 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Oliver Hartkopp <socketcan@...tkopp.net>
Cc: Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>,
Dominik Brodowski <linux@...inikbrodowski.net>,
linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
Florian Fainelli <f.fainelli@...il.com>,
Hartley Sweeten <hsweeten@...ionengravers.com>,
Ian Abbott <abbotti@....co.uk>,
Jakub Kicinski <kuba@...nel.org>,
Kevin Cernekee <cernekee@...il.com>,
Lukas Wunner <lukas@...ner.de>,
Manuel Lauss <manuel.lauss@...il.com>,
Olof Johansson <olof@...om.net>,
Robert Jarzmik <robert.jarzmik@...e.fr>,
YOKOTA Hiroshi <yokota@...lab.is.tsukuba.ac.jp>,
bcm-kernel-feedback-list@...adcom.com,
linux-arm-kernel@...ts.infradead.org, linux-can@...r.kernel.org,
linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
linux-wireless@...r.kernel.org, Netdev <netdev@...r.kernel.org>
Subject: Re: [RFC 0/6] pcmcia: separate 16-bit support from cardbus
On 27.02.2023 21:32:40, Oliver Hartkopp wrote:
> On 27.02.23 20:53, Arnd Bergmann wrote:
> > On Mon, Feb 27, 2023, at 20:07, Oliver Hartkopp wrote:
>
> > > I assume these CAN bus PCMCIA interfaces won't work after your patch
> > > set, right?
> >
> > Correct, the patch series in its current form breaks this since
> > your laptop is cardbus compatible. The options I can see are:
> >
> > - abandon my series and keep everything unchanged, possibly removing
> > some of the pcmcia drivers that Dominik identified as candidates
> >
> > - decide on a future timeline for when you are comfortable with
> > discontinuing this setup and require any CAN users with cardbus
> > laptops to move to USB or cardbus CAN adapters, apply the series
> > then
> >
> > - duplicate the yenta_socket driver to have two variants of that,
> > require the user to choose between the cardbus and the pcmcia
> > variant depending on what card is going to be used.
> >
> > Can you give more background on who is using the EMS PCMCIA card?
> > I.e. are there reasons to use this device on modern kernels with
> > machines that could also support the USB, expresscard or cardbus
> > variants, or are you likely the only one doing this for the
> > purpose of maintaining the driver?
>
> Haha, good point.
>
> In fact the EMS PCMCIA, the PEAK PCMCIA (PCAN PC Card) and the supported
> Softing PCMCIA cards are nearly 20 year old designs and they are all
> discontinued for some time now. Today you can easily get a high performance
> Classical CAN USB adapter with an excellent OSS firmware for ~13 EUR.
>
> The only other laptop CAN "Cards" I'm aware of are PCIe "ExpressCard" 34/54
> from PEAK System which use the PCI subsystem.
>
> Maybe you are right and we should simply drop the support for those old
> PCMCIA drivers which will still be supported for the LTS 6.1 lifetime then.
>
> @Marc Kleine-Budde: What do you think about removing these three drivers?
I don't have any of these cards, nor any $CUSTOMER who's using it.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
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