| Message ID | 20180917120808.20224-5-lkundrak@v3.sk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Signal pxa2xx SPI slave readiness via handshake signal [Was: SPI Slave with handshaking] | expand |
Hi Lubomir, On Mon, Sep 17, 2018 at 2:08 PM Lubomir Rintel <lkundrak@v3.sk> wrote: > This this is used to let the SPI master know that our FIFO is filled and > we're ready to service a transfer. Only useful in slave mode. > > A signal like this is used by an embedded controller on a OLPC XO 1.75 > machine, that happens to be a SPI master. > > Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Thanks for your patch! > --- a/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt > +++ b/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt > @@ -12,6 +12,8 @@ Optional properties: > - cs-gpios: list of GPIO chip selects. See the SPI bus bindings, > Documentation/devicetree/bindings/spi/spi-bus.txt > - spi-slave: Empty property indicating the SPI controller is used in slave mode. > +- ready-gpio: GPIO used to signal a SPI master that the FIFO is filled > + and we're ready to service a transfer. Only useful in slave mode. Even for the case of a single GPIO, the preferred naming is "ready-gpios". Gr{oetje,eeting}s, Geert
diff --git a/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt b/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt index 89b2832283e3..681a82b40e6f 100644 --- a/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt +++ b/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt @@ -12,6 +12,8 @@ Optional properties: - cs-gpios: list of GPIO chip selects. See the SPI bus bindings, Documentation/devicetree/bindings/spi/spi-bus.txt - spi-slave: Empty property indicating the SPI controller is used in slave mode. +- ready-gpio: GPIO used to signal a SPI master that the FIFO is filled + and we're ready to service a transfer. Only useful in slave mode. Child nodes represent devices on the SPI bus See ../spi/spi-bus.txt
This this is used to let the SPI master know that our FIFO is filled and we're ready to service a transfer. Only useful in slave mode. A signal like this is used by an embedded controller on a OLPC XO 1.75 machine, that happens to be a SPI master. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> --- Documentation/devicetree/bindings/spi/spi-pxa2xx.txt | 2 ++ 1 file changed, 2 insertions(+)