[PATCH V2 4/4] doc: lpspi: Document DT bindings for LPSPI slave mode

[Clark Wang]

Remove "fsl,imx8qxp-spi", it does not exist in spi-fsl-lpspi.c driver
for now.

Add introductions of interrupt-parent and spi-slave.

Signed-off-by: Clark Wang <xiaoning.w...@nxp.com>
---
 Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt 
b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
index 8d178a4503cf..9e44d85e0a68 100644
--- a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
+++ b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.txt
@@ -3,10 +3,12 @@
 Required properties:
 - compatible :
   - "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 +18,5 @@ lpspi2: lpspi@40290000 {
        interrupt-parent = <&intc>;
        interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&clks IMX7ULP_CLK_LPSPI2>;
+       spi-slave;
 };
-- 
2.17.1