Re: [PATCH] devicetree - document using aliases to set spi bus number.

From	Christer Weinigel <christer@weinigel.se>
Newsgroups	linux.kernel
Subject	Re: [PATCH] devicetree - document using aliases to set spi bus number.
Date	2016-05-26 13:00 +0200
Message-ID	<rD1bb-5oe-5@gated-at.bofh.it> (permalink)
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On 05/26/2016 12:07 PM, Mark Brown wrote:
> I think Rob's referring to the fact that there are no in tree DTs
> that use this feature - all the aliases for SPI controllers in
> mainline are string based.

One of the main drivers behind devicetree was that Linus got fed up
with the churn for all platform device changes in arch/arm.  I faintly
recall him writing that he would be rather unhappy if that just got
replaced with churn for devicetree dts files.

It makes sense to include dts files for reference boards in the
mainline kernel.  To include dts files for every vendors variant of a
design would add just as much churn and be rather pointless.  My guess
is that the dts file for most platforms are kept private.

For platforms based on a FPGA such as the Xilinx Zync it's even more
pointless to submit dts files to mainline.  When you have "hardware"
that can be reconfigured the device tree files can't be set in stone.
 If I use Xilinx tools [1] to add one more UART I have just added new
hardware this needs to be reflected in the devicetree for the devices
to be usable in Linux.  And something like aliases which provides a
stable device name can be very useful here.

  /Christer

[1] http://www.wiki.xilinx.com/Build+Device+Tree+Blob

Thread

[PATCH] devicetree - document using aliases to set spi bus number. Christer Weinigel <christer@weinigel.se> - 2016-05-24 18:50 +0200
  Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-24 19:30 +0200
    Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-24 20:20 +0200
      Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-24 20:40 +0200
        Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-24 21:00 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Rutland <mark.rutland@arm.com> - 2016-05-25 14:20 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 15:00 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 14:40 +0200
        Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 01:40 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 02:20 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus  number. Rob Herring <robh@kernel.org> - 2016-05-25 19:50 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 20:10 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 20:10 +0200
              Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 20:50 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-26 03:20 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus number. Rob Herring <robh@kernel.org> - 2016-05-26 03:50 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-26 04:00 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-26 12:20 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-26 13:00 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-26 20:50 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-26 23:10 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-27 18:50 +0200
  Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Rutland <mark.rutland@arm.com> - 2016-05-24 19:50 +0200
    Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-24 22:50 +0200
      Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Rutland <mark.rutland@arm.com> - 2016-05-25 11:30 +0200
        Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 12:40 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-25 13:30 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Rutland <mark.rutland@arm.com> - 2016-05-25 14:40 +0200
              Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 15:10 +0200
        Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 17:40 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Rutland <mark.rutland@arm.com> - 2016-05-25 18:10 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 18:30 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 20:10 +0200
          Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 20:00 +0200
            Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 20:50 +0200
              Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-27 20:40 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Christer Weinigel <christer@weinigel.se> - 2016-05-28 23:00 +0200
                Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-30 18:20 +0200
    Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 17:30 +0200
      Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Rutland <mark.rutland@arm.com> - 2016-05-25 18:10 +0200
        Re: [PATCH] devicetree - document using aliases to set spi bus number. Frank Rowand <frowand.list@gmail.com> - 2016-05-25 18:40 +0200
    Re: [PATCH] devicetree - document using aliases to set spi bus  number. Mark Brown <broonie@kernel.org> - 2016-05-25 20:50 +0200
    Re: [PATCH] devicetree - document using aliases to set spi bus  number. Rob Herring <robh@kernel.org> - 2016-05-25 20:50 +0200
      Re: [PATCH] devicetree - document using aliases to set spi bus number. Geert Uytterhoeven <geert@linux-m68k.org> - 2016-05-26 10:30 +0200

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