Messages in this thread | | | From | Geert Uytterhoeven <> | Date | Fri, 7 Oct 2016 21:33:15 +0200 | Subject | Re: [PATCHv2 1/2] Documentation: dt: spi: Add GPIO Slave Select Parameter |
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On Fri, Oct 7, 2016 at 4:56 PM, <tthayer@opensource.altera.com> wrote: > From: Thor Thayer <tthayer@opensource.altera.com> > > Some SPI masters require the slave to be selected before a > transaction can occur - even in the case of GPIO chip select. > > This patch adds a GPIO slave select parameter to indicate > the slave needs to be selected in the GPIO CS case. > > Signed-off-by: Thor Thayer <tthayer@opensource.altera.com> > --- > v2 Add to SPI framework - add bindings. > --- > Documentation/devicetree/bindings/spi/spi-bus.txt | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt > index 4b1d6e7..3a006bc 100644 > --- a/Documentation/devicetree/bindings/spi/spi-bus.txt > +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt > @@ -24,6 +24,7 @@ support describing the chip select layout. > Optional properties: > - cs-gpios - gpios chip select. > - num-cs - total number of chipselects. > +- gpio-ss - use internal slave select with gpio chip select. > > If cs-gpios is used the number of chip selects will be increased automatically > with max(cs-gpios > hw cs).
To me, this looks more like a new flag the SPI controller driver should set in spi_master.flags, instead of a DT property.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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