On Tue, Feb 16, 2010 at 07:39:57PM +0100, Ernst Schwab wrote: > From: Ernst Schwab > > Added devicetree binding documentation for gpios used as chipselect. The > code to evaluate these is already present in spi_mpc8xxx.c. > > Signed-off-by: Ernst Schwab > --- > diff -upr a/Documentation/powerpc/dts-bindings/fsl/spi.txt b/Documentation/powerpc/dts-bindings/fsl/spi.txt > --- a/Documentation/powerpc/dts-bindings/fsl/spi.txt > +++ b/Documentation/powerpc/dts-bindings/fsl/spi.txt > @@ -13,6 +13,11 @@ Required properties: > - interrupt-parent : the phandle for the interrupt controller that > services interrupts for this device. > > +Optional properties: > +- gpios : specifies the gpio pins to be used for chipselects. > + The gpios will be referred to as reg= in the SPI child nodes. > + If unspecified, a single SPI device without a chip select can be used. Minor: I'd prefer spaces around the '='. > + > Example: > spi@4c0 { > cell-index = <0>; > @@ -21,4 +26,6 @@ Example: > interrupts = <82 0>; > interrupt-parent = <700>; > mode = "cpu"; > + gpios = <&gpio 18 1 // device reg=<0>, low-active > + &gpio 19 1>; // device reg=<1>, low-active I'd drop the comments. GPIO controllers may have private xlate-functions, so '1' could theoretically mean something else than "low-active" (although in practice it hopefully won't). > }; > > > _______________________________________________ > devicetree-discuss mailing list > devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org > https://lists.ozlabs.org/listinfo/devicetree-discuss -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |