linux-kernel - Re: [PATCH v5 01/15] thunderbolt: Add initial cactus ridge NHI support

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Date:	Fri, 20 Jun 2014 09:41:52 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Andreas Noever <andreas.noever@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Greg KH <greg@...ah.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v5 01/15] thunderbolt: Add initial cactus ridge NHI
 support

On Tue, 2014-06-03 at 22:03 +0200, Andreas Noever wrote:
> Thunderbolt hotplug is supposed to be handled by the firmware. But Apple
> decided to implement thunderbolt at the operating system level. The
> firmare only initializes thunderbolt devices that are present at boot
> time. This driver enables hotplug of thunderbolt of non-chained
> thunderbolt devices on Apple systems with a cactus ridge controller.
> 
> This first patch adds the Kconfig file as well the parts of the driver
> which talk directly to the hardware (that is pci device setup, interrupt
> handling and RX/TX ring management).
> 
> Signed-off-by: Andreas Noever <andreas.noever@...il.com>
> ---

This patch landed in today's linux-next (next-20140620).

> [...]
> --- /dev/null
> +++ b/drivers/thunderbolt/Kconfig
> @@ -0,0 +1,12 @@
> +menuconfig THUNDERBOLT
> +	tristate "Thunderbolt support for Apple devices"
> +	default no

That should have been "default n". But "n" is the default anyway, so I'd
say this line might as well be dropped. Should I draft the trivial patch
to do that?

> +	help
> +	  Cactus Ridge Thunderbolt Controller driver
> +	  This driver is required if you want to hotplug Thunderbolt devices on
> +	  Apple hardware.
> +
> +	  Device chaining is currently not supported.
> +
> +	  To compile this driver a module, choose M here. The module will be
> +	  called thunderbolt.

(Naive question: is Thunderbolt relevant outside x86_64?)


Paul Bolle

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