BBB and BBAI compatible relayCape overlay

src/arm/BBORG_RELAY-00A2.dts

@@ -1,4 +1,8 @@
 /*
+ * Copyright (C) 2020 Deepak Khatri <[email protected]>
+ *
+ * Based on the BBORG_RELAY-00A2.dts written by 
+ * Robert Nelson & Amilcar Lucas for kernel <4.14
  * Copyright (C) 2015 Robert Nelson <[email protected]>
  * Copyright (C) 2019 Amilcar Lucas <[email protected]>
  *
@@ -10,107 +14,71 @@
 /dts-v1/;
 /plugin/;
 
-#include <dt-bindings/board/am335x-bbw-bbb-base.h>
-#include <dt-bindings/gpio/gpio.h>
-#include <dt-bindings/pinctrl/am33xx.h>
-
-/ {
- compatible = "ti,beaglebone", "ti,beaglebone-black", "ti,beaglebone-green";
-
- /* identification */
- part-number = "BBORG_RELAY";
- version = "00A2";
+/*
+ * Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
+ */
+&{/chosen} {
+ overlays {
+ BBORG_RELAY-00A2 = __TIMESTAMP__;
+ };
+};
 
- /* state the resources this cape uses */
- exclusive-use =
- /* the pin header uses */
- "P9.41", /* gpio0_20 */
- "P9.42", /* gpio0_07 */
- "P9.30", /* gpio3_16 */
- "P9.27", /* gpio3_19 */
- /* the hardware ip uses */
- "gpio1_16",
- "gpio0_07",
- "gpio3_16",
- "gpio3_19";
+/*
+ * Free up the pins used by the cape from the pinmux helpers.
+ */
+&ocp {
+ P9_41_pinmux { status = "disabled"; };
+ P9_42_pinmux { status = "disabled"; };
+ P9_30_pinmux { status = "disabled"; };
+ P9_27_pinmux { status = "disabled"; };
+};
 
- /*
- * Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
- */
- fragment@0 {
- target-path="/";
- __overlay__ {
+/*
+ * Enable and Update the default state of the pins
+ */
+&ocp {
+ P9_41_pinmux { status = "okay"; pinctrl-0 = <&P9_41_gpio_pin>;};
+ P9_42_pinmux { status = "okay"; pinctrl-0 = <&P9_42_gpio_pin>;};
+ P9_30_pinmux { status = "okay"; pinctrl-0 = <&P9_30_gpio_pin>;};
+ P9_27_pinmux { status = "okay"; pinctrl-0 = <&P9_27_gpio_pin>;};
+};
 
- chosen {
- overlays {
- BBORG_RELAY-00A2 = __TIMESTAMP__;
- };
- };
+/*
+ * Easy relay control through sysfs (/sys/class/leds/) using gpio-leds driver
+ * See these files for the led_P8_#/led_P9_# definition
+ * https://github.com/beagleboard/BeagleBoard-DeviceTrees/src/arm/bbai-bone-buses.dtsi
+ * https://github.com/beagleboard/BeagleBoard-DeviceTrees/src/arm/bbb-bone-buses.dtsi
+ * 
+ */
+&{/} {
+ leds {
+
+ // relay1
+ led_P9_41{
+ status = "okay";
+ label = "relay1";
+ default-state = "keep";
  };
- };
 
- /*
- * Free up the pins used by the cape from the pinmux helpers.
- */
- fragment@1 {
- target = <&ocp>;
- __overlay__ {
- P9_41_pinmux { status = "disabled"; }; /* P9_41: gpmc_a0.gpio0_20 */
- P9_42_pinmux { status = "disabled"; }; /* P9_42: gpmc_a1.gpio0_07 */
- P9_30_pinmux { status = "disabled"; }; /* P9_30: gpmc_be1n.gpio3_16 */
- P9_27_pinmux { status = "disabled"; }; /* P9_27: mcasp0_fsr.gpio3_19 */
+ // relay2
+ led_P9_42{
+ status = "okay";
+ label = "relay2";
+ default-state = "keep";
  };
- };
 
- fragment@2 {
- target = <&am33xx_pinmux>;
- __overlay__ {
-
- bb_gpio_relay_pins: pinmux_bb_gpio_relay_pins {
- pinctrl-single,pins = <
- BONE_P9_41 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* P9_41: gpmc_a0.gpio0_20 */
- BONE_P9_42 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* P9_42: gpmc_a1.gpio0_07 */
- BONE_P9_30 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* P9_30: gpmc_be1n.gpio3_16 */
- BONE_P9_27 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* P9_27: mcasp0_fsr.gpio3_19 */
- >;
- };
+ // realy3
+ led_P9_30{
+ status = "okay";
+ label = "relay3";
+ default-state = "keep";
  };
- };
-
- fragment@3 {
- target-path="/";
- __overlay__ {
 
- leds {
- pinctrl-names = "default";
- pinctrl-0 = <&bb_gpio_relay_pins>;
-
- compatible = "gpio-leds";
-
- jp@1 {
- label = "relay-jp1";
- gpios = <&gpio0 20 GPIO_ACTIVE_HIGH>;
- default-state = "keep";
- };
-
- jp@2 {
- label = "relay-jp2";
- gpios = <&gpio0 07 GPIO_ACTIVE_HIGH>;
- default-state = "keep";
- };
-
- jp@3 {
- label = "relay-jp3";
- gpios = <&gpio3 16 GPIO_ACTIVE_HIGH>;
- default-state = "keep";
- };
-
- jp@4 {
- label = "relay-jp4";
- gpios = <&gpio3 19 GPIO_ACTIVE_HIGH>;
- default-state = "keep";
- };
- };
+ // realy4
+ led_P9_27{
+ status = "okay";
+ label = "relay4";
+ default-state = "keep";
  };
  };
-};
+};