openwrt/target/linux/brcm2708/patches-4.4/0211-BCM270X_DT-Add-pi3-act-led-overlay.patch

From b77abe2ef3f89489f9ca47653170bf31c3ea0bab Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 23 Mar 2016 15:57:14 +0000
Subject: [PATCH] BCM270X_DT: Add pi3-act-led overlay

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile                |  1 +
 arch/arm/boot/dts/overlays/README                  | 19 +++++++++++++++
 arch/arm/boot/dts/overlays/pi3-act-led-overlay.dts | 27 ++++++++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/pi3-act-led-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -39,6 +39,7 @@ dtbo-$(RPI_DT_OVERLAYS) += mcp2515-can0.
 dtbo-$(RPI_DT_OVERLAYS) += mcp2515-can1.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += mmc.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += mz61581.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += pi3-act-led.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += pi3-disable-bt.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += pi3-miniuart-bt.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += piscreen.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -136,12 +136,14 @@ Params:
 
         act_led_activelow       Set to "on" to invert the sense of the LED
                                 (default "off")
+                                N.B. For Pi3 see pi3-act-led overlay.
 
         act_led_gpio            Set which GPIO to use for the activity LED
                                 (in case you want to connect it to an external
                                 device)
                                 (default "16" on a non-Plus board, "47" on a
                                 Plus or Pi 2)
+                                N.B. For Pi3 see pi3-act-led overlay.
 
         pwr_led_trigger
         pwr_led_activelow
@@ -499,6 +501,23 @@ Params: speed                   Display
 [ The pcf8563-rtc overlay has been deleted. See i2c-rtc. ]
 
 
+Name:   pi3-act-led
+Info:   Pi3 uses a GPIO expander to drive the LEDs which can only be accessed
+        from the VPU. There is a special driver for this with a separate DT
+        node, which has the unfortunate consequence of breaking the
+        act_led_gpio and act_led_activelow dtparams.
+        This overlay changes the GPIO controller back to the standard one and
+        restores the dtparams.
+Load:   dtoverlay=pi3-act-led,<param>=<val>
+Params: activelow               Set to "on" to invert the sense of the LED
+                                (default "off")
+
+        gpio                    Set which GPIO to use for the activity LED
+                                (in case you want to connect it to an external
+                                device)
+                                REQUIRED
+
+
 Name:   pi3-disable-bt
 Info:   Disable Pi3 Bluetooth and restore UART0/ttyAMA0 over GPIOs 14 & 15
         N.B. To disable the systemd service that initialises the modem so it
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pi3-act-led-overlay.dts
@@ -0,0 +1,27 @@
+/dts-v1/;
+/plugin/;
+
+/* Pi3 uses a GPIO expander to drive the LEDs which can only be accessed
+   from the VPU. There is a special driver for this with a separate DT node,
+   which has the unfortunate consequence of breaking the act_led_gpio and
+   act_led_activelow dtparams.
+
+   This overlay changes the GPIO controller back to the standard one and
+   restores the dtparams.
+*/
+
+/{
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&act_led>;
+		frag0: __overlay__ {
+			gpios = <&gpio 0 0>;
+		};
+	};
+
+	__overrides__ {
+		gpio = <&frag0>,"gpios:4";
+		activelow = <&frag0>,"gpios:8";
+	};
+};