diff mbox series

[v3,4/6] spi: pxa2xx: dt-bindings: Add ready GPIO signal

Message ID 20181113102228.820214-5-lkundrak@v3.sk (mailing list archive)
State Accepted
Commit 8ae13d0b0d4bb4af99bec8c50152f0c8f5cbcc06
Headers show
Series spi: pxa2xx: add slave mode support | expand

Commit Message

Lubomir Rintel Nov. 13, 2018, 10:22 a.m. UTC 
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>
Acked-by: Pavel Machek <pavel@ucw.cz>

---
Changes since v2:
- s/ready-gpio/ready-gpios/
- Updated the subject line to conform with subsystem customs

 Documentation/devicetree/bindings/spi/spi-pxa2xx.txt | 2 ++
 1 file changed, 2 insertions(+)

Comments

Geert Uytterhoeven Nov. 13, 2018, 10:29 a.m. UTC | #1 
On Tue, Nov 13, 2018 at 11:23 AM 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>
> Acked-by: Pavel Machek <pavel@ucw.cz>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt b/Documentation/devicetree/bindings/spi/spi-pxa2xx.txt
index 89b2832283e3..e30e0c2a4bce 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-gpios: 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