@@ -69,6 +69,11 @@ properties:
Should be generally avoided and be replaced by
spi-cs-high + ACTIVE_HIGH.
+ The simplest way to obtain an active-high CS signal is to configure the
+ controller's cs-gpio property with the ACTIVE_HIGH flag and set the
+ peripheral's spi-cs-high property. See example below for a better
+ understanding.
+
fifo-depth:
$ref: /schemas/types.yaml#/definitions/uint32
description:
@@ -189,3 +194,23 @@ examples:
stacked-memories = /bits/ 64 <0x10000000 0x10000000>;
};
};
+
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi@20204000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "brcm,bcm2835-spi";
+ reg = <0x7e204000 0x1000>;
+ interrupts = <2 22>;
+ clocks = <&clk_spi>;
+ cs-gpios = <&gpio 8 GPIO_ACTIVE_HIGH>;
+
+ display@0 {
+ compatible = "sitronix,st7920";
+ spi-max-frequency = <600000>;
+ reg = <0>;
+ spi-cs-high;
+ };
+ };
The current documentation does not clearly explain how to invert the SPI CS signal to make it active-high. This makes it very difficult to understand. This patch adds a simple explanation on how to set the CS line in active-high and adds an example to make it easier for users who need that setup for their SPI peripherals. Link: https://forums.raspberrypi.com/viewtopic.php?t=378222 Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com> --- .../bindings/spi/spi-controller.yaml | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+)