diff mbox

[PATCHv2,2/2] spi: imx: document use of native chip-selects in devicetree

Message ID 1490100205-31309-3-git-send-email-gerg@linux-m68k.org (mailing list archive)
State New, archived
Headers show

Commit Message

Greg Ungerer March 21, 2017, 12:43 p.m. UTC 
Document the "<0>" notation for specifying use of a native chip-select
in the "cs-gpios" tag of an SPI device in devicetree. This isn't unique
to the spi-imx driver, but this clearly spells out that you can use it
with this driver.

Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
---
 Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

v2: added documentation to patch set
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
index 8bc95e2..cfc60cb 100644
--- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
+++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
@@ -12,6 +12,7 @@  Required properties:
 - reg : Offset and length of the register set for the device
 - interrupts : Should contain CSPI/eCSPI interrupt
 - cs-gpios : Specifies the gpio pins to be used for chipselects.
+	Specify use of native chipselects with "<0>" in place of a gpio.
 - clocks : Clock specifiers for both ipg and per clocks.
 - clock-names : Clock names should include both "ipg" and "per"
 See the clock consumer binding,
@@ -32,7 +33,8 @@  ecspi@70010000 {
 	reg = <0x70010000 0x4000>;
 	interrupts = <36>;
 	cs-gpios = <&gpio3 24 0>, /* GPIO3_24 */
-		   <&gpio3 25 0>; /* GPIO3_25 */
+		   <&gpio3 25 0>, /* GPIO3_25 */
+		   <0>;           /* Native chip select */
 	dmas = <&sdma 3 7 1>, <&sdma 4 7 2>;
 	dma-names = "rx", "tx";
 };