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From d27d1447e49bc6ffa92f787f7bc5c2eea29ba7d2 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Wed, 30 Sep 2020 12:08:08 +0100
Subject: [PATCH] overlays: Add fsm-demo overlay
fsm-demo demonstrates the usage of the gpio-fsm driver. It is
designed to be used with a set of "traffic light" LEDs on GPIOs
7, 8 and 25.
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 8 ++
.../boot/dts/overlays/fsm-demo-overlay.dts | 104 ++++++++++++++++++
3 files changed, 113 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/fsm-demo-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -44,6 +44,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
enc28j60-spi2.dtbo \
exc3000.dtbo \
fe-pi-audio.dtbo \
+ fsm-demo.dtbo \
goodix.dtbo \
googlevoicehat-soundcard.dtbo \
gpio-fan.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -767,6 +767,14 @@ Load: dtoverlay=fe-pi-audio
Params: <None>
+Name: fsm-demo
+Info: A demonstration of the gpio-fsm driver. The GPIOs are chosen to work
+ nicely with a "traffic-light" display of red, amber and green LEDs on
+ GPIOs 7, 8 and 25 respectively.
+Load: dtoverlay=fsm-demo,<param>=<val>
+Params: fsm_debug Enable debug logging (default off)
+
+
Name: goodix
Info: Enables I2C connected Goodix gt9271 multiple touch controller using
GPIOs 4 and 17 (pins 7 and 11 on GPIO header) for interrupt and reset.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/fsm-demo-overlay.dts
@@ -0,0 +1,104 @@
+// Demo overlay for the gpio-fsm driver
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio-fsm.h>
+
+#define BUTTON1 GF_IP(0)
+#define BUTTON2 GF_SW(0)
+#define RED GF_OP(0) // GPIO7
+#define AMBER GF_OP(1) // GPIO8
+#define GREEN GF_OP(2) // GPIO25
+
+/{
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target-path = "/";
+ __overlay__ {
+ fsm_demo: fsm-demo {
+ compatible = "rpi,gpio-fsm";
+
+ debug = <0>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ num-soft-gpios = <1>;
+ gpio-line-names = "button2";
+ input-gpios = <&gpio 6 1>; // BUTTON1 (active-low)
+ output-gpios = <&gpio 7 0>, // RED
+ <&gpio 8 0>, // AMBER
+ <&gpio 25 0>; // GREEN
+ shutdown-timeout-ms = <2000>;
+
+ start {
+ start_state;
+ set = <RED 1>, <AMBER 0>, <GREEN 0>;
+ start2 = <GF_DELAY 250>;
+ };
+
+ start2 {
+ set = <RED 0>, <AMBER 1>;
+ go = <GF_DELAY 250>;
+ };
+
+ go {
+ set = <RED 0>, <AMBER 0>, <GREEN 1>;
+ ready_wait = <BUTTON1 0>;
+ shutdown1 = <GF_SHUTDOWN 0>;
+ };
+
+ ready_wait {
+ // Clear the soft GPIO
+ set = <BUTTON2 0>;
+ ready = <GF_DELAY 1000>;
+ shutdown1 = <GF_SHUTDOWN 0>;
+ };
+
+ ready {
+ stopping = <BUTTON1 1>, <BUTTON2 1>;
+ shutdown1 = <GF_SHUTDOWN 0>;
+ };
+
+ stopping {
+ set = <GREEN 0>, <AMBER 1>;
+ stopped = <GF_DELAY 1000>;
+ };
+
+ stopped {
+ set = <AMBER 0>, <RED 1>;
+ get_set = <GF_DELAY 3000>;
+ shutdown1 = <GF_SHUTDOWN 0>;
+ };
+
+ get_set {
+ set = <AMBER 1>;
+ go = <GF_DELAY 1000>;
+ };
+
+ shutdown1 {
+ set = <RED 0>, <AMBER 0>, <GREEN 1>;
+ shutdown2 = <GF_SHUTDOWN 250>;
+ };
+
+ shutdown2 {
+ set = <AMBER 1>, <GREEN 0>;
+ shutdown3 = <GF_SHUTDOWN 250>;
+ };
+
+ shutdown3 {
+ set = <RED 1>, <AMBER 0>;
+ shutdown4 = <GF_SHUTDOWN 250>;
+ };
+
+ shutdown4 {
+ shutdown_state;
+ set = <RED 0>;
+ };
+ };
+ };
+ };
+
+ __overrides__ {
+ fsm_debug = <&fsm_demo>,"debug:0";
+ };
+};
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