linux-kernel - Re: [PATCH v11 2/4] fpga manager: add sysfs interface document

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Date:	Tue, 22 Sep 2015 17:52:34 -0700
From:	Moritz Fischer <moritz.fischer@...us.com>
To:	Alan Tull <atull@...nsource.altera.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	hpa@...or.com, Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>, rdunlap@...radead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	robh+dt@...nel.org, Grant Likely <grant.likely@...aro.org>,
	iws@...o.caltech.edu, linux-doc@...r.kernel.org,
	Pavel Machek <pavel@...x.de>, broonie@...nel.org,
	Philip Balister <philip@...ister.org>, rubini@...dd.com,
	s.trumtrar@...gutronix.de, jason@...edaemon.net, kyle.teske@...com,
	Nicolas Pitre <nico@...aro.org>, balbi@...com,
	m.chehab@...sung.com, David Brown <davidb@...eaurora.org>,
	Rob Landley <rob@...dley.net>, davem@...emloft.net,
	cesarb@...arb.net, sameo@...ux.intel.com,
	akpm@...ux-foundation.org,
	Linus Walleij <linus.walleij@...aro.org>, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	Kumar Gala <galak@...eaurora.org>, devel@...verdev.osuosl.org,
	Petr Cvek <petr.cvek@....cz>,
	Alan Tull <delicious.quinoa@...il.com>,
	dinguyen@...nsource.altera.com
Subject: Re: [PATCH v11 2/4] fpga manager: add sysfs interface document

On Tue, Sep 22, 2015 at 8:21 AM,  <atull@...nsource.altera.com> wrote:
> From: Alan Tull <atull@...nsource.altera.com>
>
> Add documentation under drivers/staging for new fpga manager's
> sysfs interface.
>
Reviewed-by: Moritz Fischer <moritz.fischer@...us.com>
> Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> ---
> v5  : (actually second version, but keeping version numbers
>       aligned with rest of patch series)
>       Move document to drivers/staging/fpga/Documentation/ABI
>
> v6  : No change in this patch for v6 of the patch set
> v7  : No change in this patch for v7 of the patch set
> v8  : No change in this patch for v8 of the patch set
>
> v9  : Remove 'firmware' and 'reset' files
>       Update state strings
>
> v10 : Clarifications about state attribute
>       Move to Documentation/ABI/testing/
>
> v11 : No change in this patch for v11 of the patch set
> ---
>  Documentation/ABI/testing/sysfs-class-fpga-manager |   37 ++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-class-fpga-manager
>
> diff --git a/Documentation/ABI/testing/sysfs-class-fpga-manager b/Documentation/ABI/testing/sysfs-class-fpga-manager
> new file mode 100644
> index 0000000..23056c5
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-class-fpga-manager
> @@ -0,0 +1,37 @@
> +What:          /sys/class/fpga_manager/<fpga>/name
> +Date:          August 2015
> +KernelVersion: 4.3
> +Contact:       Alan Tull <atull@...nsource.altera.com>
> +Description:   Name of low level fpga manager driver.
> +
> +What:          /sys/class/fpga_manager/<fpga>/state
> +Date:          August 2015
> +KernelVersion: 4.3
> +Contact:       Alan Tull <atull@...nsource.altera.com>
> +Description:   Read fpga manager state as a string.
> +               The intent is to provide enough detail that if something goes
> +               wrong during FPGA programming (something that the driver can't
> +               fix) then userspace can know, i.e. if the firmware request
> +               fails, that could be due to not being able to find the firmware
> +               file.
> +
> +               This is a superset of FPGA states and fpga manager driver
> +               states.  The fpga manager driver is walking through these steps
> +               to get the FPGA into a known operating state.  It's a sequence,
> +               though some steps may get skipped.  Valid FPGA states will vary
> +               by manufacturer; this is a superset.
> +
> +               * unknown               = can't determine state
> +               * power off             = FPGA power is off
> +               * power up              = FPGA reports power is up
> +               * reset                 = FPGA held in reset state
> +               * firmware request      = firmware class request in progress
> +               * firmware request error = firmware request failed
> +               * write init            = preparing FPGA for programming
> +               * write init error      = Error while preparing FPGA for
> +                                         programming
> +               * write                 = FPGA ready to receive image data
> +               * write error           = Error while programming
> +               * write complete        = Doing post programming steps
> +               * write complete error  = Error while doing post programming
> +               * operating             = FPGA is programmed and operating
> --
> 1.7.9.5
>

Cheers,

Moritz
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