linux-kernel - Re: [patch v6 0/3] JTAG driver introduction

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Message-ID: <593cd0d3-8e06-0992-c155-1322014c0477@longlandclan.id.au>
Date:   Fri, 25 Aug 2017 18:50:23 +1000
From:   Stuart Longland <stuartl@...glandclan.id.au>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rick Altherr <raltherr@...gle.com>
Cc:     Oleksandr Shamray <oleksandrs@...lanox.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Jiří Pírko <jiri@...nulli.us>,
        Arnd Bergmann <arnd@...db.de>,
        system-sw-low-level@...lanox.com,
        Greg KH <gregkh@...uxfoundation.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        openocd-devel-owner@...ts.sourceforge.net, mec@...ut.net,
        Rob Herring <robh+dt@...nel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Tobias Klauser <tklauser@...tanz.ch>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [patch v6 0/3] JTAG driver introduction

[Note: dropping vadimp@...llanox.com as SMTP server complained about the
DNS server returning NXDOMAIN.  Apologies.]
On 25/08/17 18:32, Linus Walleij wrote:
> Gnah!
> Whoever writes a slot-in replacement making the character device
> take precendence wins lots of karma.

What would such a replacement look like though?

Some sort of system whereby you can read/write single-line commands as
if talking to a GPIO expander over a UART?

Would you access the GPIOs one by one, or would you perhaps map them
into a bitmap (maybe arbitrarily, up to 64-bits wide) and perform masked
operations on the bitmap?

I'm no fan of the sysfs GPIO interface, but it beats poking around at
registers behind the kernel's back.
-- 
Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...
  ...it's backed up on a tape somewhere.



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