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Message-Id: <1464107960-10775-1-git-send-email-christer@weinigel.se> Date: Tue, 24 May 2016 18:39:20 +0200 From: Christer Weinigel <christer@...nigel.se> To: linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org, devicetree@...r.kernel.org Cc: Christer Weinigel <christer@...nigel.se>, Mark Brown <broonie@...nel.org> Subject: [PATCH] devicetree - document using aliases to set spi bus number. Document how to use devicetree aliases to assign a stable bus number to a spi bus. Signed-off-by: Christer Weinigel <christer@...nigel.se> --- Trivial documentation change. Not having used devicetree that much it was surprisingly hard to figure out how to assign a stable bus number to a spi bus. Add a simple example that shows how to do that. Mark Cced as the SPI maintainer. Or should trivial documentation fixes like this be addressed to someone else? /Christer Documentation/devicetree/bindings/spi/spi-bus.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index 42d5954..c35c4c2 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -94,3 +94,13 @@ SPI example for an MPC5200 SPI bus: reg = <1>; }; }; + +Normally SPI buses are assigned dynamic bus numbers starting at 32766 +and counting downwards. It is possible to assign the bus number +statically using devicetee aliases. For example, on the MPC5200 the +"spi@f00" device above is connected to the "soc" bus. To set its +bus_num to 1 add an aliases entry like this: + + aliases { + spi1 = "/soc/spi@f00"; + }; -- 1.9.1
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