From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pantelis Antoniou Subject: Re: [PATCH v2 2/3] ARM: dts: socfpga: fpga bridges bindings docs Date: Fri, 24 Oct 2014 12:20:53 +0300 Message-ID: <5FB7B7FD-7B5B-4250-BADE-85573FDBBE48@konsulko.com> References: <1414108267-22058-1-git-send-email-atull@opensource.altera.com> <1414108267-22058-3-git-send-email-atull@opensource.altera.com> <20141024070042.GL10262@pengutronix.de> Mime-Version: 1.0 (Mac OS X Mail 8.0 \(1990.1\)) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20141024070042.GL10262@pengutronix.de> Sender: linux-kernel-owner@vger.kernel.org To: Steffen Trumtrar Cc: atull@opensource.altera.com, jgunthorpe@obsidianresearch.com, hpa@zytor.com, Michal Simek , michal.simek@xilinx.com, rdunlap@infradead.org, Greg Kroah-Hartman , linux-kernel , devicetree@vger.kernel.org, robh+dt@kernel.org, Grant Likely , iws@ovro.caltech.edu, linux-doc@vger.kernel.org, pavel@denx.de, broonie@kernel.org, philip@balister.org, rubini@gnudd.com, jason@lakedaemon.net, kyle.teske@ni.com, nico@linaro.org, balbi@ti.com, m.chehab@samsung.com, davidb@codeaurora.org, rob@landley.net, davem@davemloft.net, cesarb@cesarb.net, sameo@linux.intel.com, akpm@linux-foundation.org, linus.walleij@linaro.org, mgerlach@opensource.altera.com, delicious.quinoa@gmail.com, dinguyen@opensource.altera.com, yvanderv@opensource.altera.com List-Id: devicetree@vger.kernel.org Hi Stefan, Allan, Sorry, haven=E2=80=99t had a chance to review all this yet; will do so = in the weekend. Just wanted to pop in and comment on a few things. > On Oct 24, 2014, at 10:00 AM, Steffen Trumtrar wrote: >=20 > Hi! >=20 > On Thu, Oct 23, 2014 at 06:51:06PM -0500, atull@opensource.altera.com= wrote: >> From: Alan Tull >=20 > (...) >=20 >> diff --git a/Documentation/devicetree/bindings/fpga/altera-hps2fpga-= bridge.txt b/Documentation/devicetree/bindings/fpga/altera-hps2fpga-bri= dge.txt >> new file mode 100644 >> index 0000000..bc24a2e >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/fpga/altera-hps2fpga-bridge.= txt >> @@ -0,0 +1,53 @@ >> +Altera FPGA/HPS Bridge Driver >> + >> +This driver manages a bridge between a FPGA and a host processor sy= stem (HPS). >> +User space can enable or disable the bridge by writing a "1" or a "= 0", >> +respectively, to its enable file under bridge's entry in >> +/sys/class/fpga-bridge. Typically, one disables the bridges before >> +reprogramming the FPGA. Once the FPGA is reprogrammed, the bridges= are >> +reenabled. >> + >=20 > NAK. >=20 > This is all linux specific and doesn't belong here. >=20 We know. The DT spec hasn=E2=80=99t been updated for a while, and this = is going to be part of what we want to do with the restarting of the ePAPR spec proces= s. So absolutes like =E2=80=9CDT is a hardware description only" might be = too strong statements, that do not work in practice anymore. There=E2=80=99s no such thing as pure hardware devices lately - there i= s always a configuration component; some of it OS specific, some of it not. We have to be engaged in the process and figure out how to update the s= pec for what is now the state of the art in the industry. Regards =E2=80=94 Pantelis