doc: lpspi: Document DT bindings for LPSPI slave mode

Add introductions of interrupt-parent and spi-slave.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
index 8d178a4..6cc3c6f 100644 (file)
--- a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
+++ b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
@@ -5,8 +5,11 @@ Required properties:
   - "fsl,imx7ulp-spi" for LPSPI compatible with the one integrated on i.MX7ULP soc
   - "fsl,imx8qxp-spi" for LPSPI compatible with the one integrated on i.MX8QXP soc
 - reg : address and length of the lpspi master registers
+- interrupt-parent : core interrupt controller
 - interrupts : lpspi interrupt
 - clocks : lpspi clock specifier
+- spi-slave : spi slave mode support. In slave mode, add this attribute without
+             value. In master mode, remove it.
 
 Examples:
 
@@ -16,4 +19,5 @@ lpspi2: lpspi@40290000 {
        interrupt-parent = <&intc>;
        interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&clks IMX7ULP_CLK_LPSPI2>;
+       spi-slave;
 };