From 3fd6d30806724fa8b07ae625d828c49855c42fbe Mon Sep 17 00:00:00 2001
From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Date: Sun, 19 Sep 2021 13:30:43 +0200
Subject: [PATCH] overlays: add support for the MLX90640 thermal camera

This allows using the video-i2c camera driver with MLX90640 thermal
infrared sensors, connected to Raspberry Pi. CONFIG_VIDEO_V4L2_I2C
has to be selected to use the camera.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             |  6 +++++
 .../boot/dts/overlays/mlx90640-overlay.dts    | 22 +++++++++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/mlx90640-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -129,6 +129,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	midi-uart5.dtbo \
 	minipitft13.dtbo \
 	miniuart-bt.dtbo \
+	mlx90640.dtbo \
 	mmc.dtbo \
 	mpu6050.dtbo \
 	mz61581.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2152,6 +2152,12 @@ Params: krnbt                   Set to "
                                 driver without need of hciattach/btattach
 
 
+Name:   mlx90640
+Info:   Overlay for i2c connected mlx90640 thermal camera
+Load:   dtoverlay=mlx90640
+Params: <None>
+
+
 Name:   mmc
 Info:   Selects the bcm2835-mmc SD/MMC driver, optionally with overclock
 Load:   dtoverlay=mmc,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mlx90640-overlay.dts
@@ -0,0 +1,22 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&i2c_arm>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			clock-frequency = <400000>;
+
+			mlx90640: mlx90640@33 {
+				compatible = "melexis,mlx90640";
+				reg = <0x33>;
+				status = "okay";
+			};
+		};
+	};
+};