From 82298c670f768f392f48526fe7c8a93682e83998 Mon Sep 17 00:00:00 2001
From: Peter Huewe <peterhuewe@gmx.de>
Date: Thu, 14 Jun 2018 22:51:24 +0200
Subject: [PATCH] Add overlay for SLB9760 Iridium /LetsTrust TPM

Device Tree overlay for the Infineon SLB9670 Trusted Platform Module add-on
boards, which can be used as a secure key storage and hwrng.
available as "Iridium SLB9670" by Infineon and "LetsTrust TPM" by
pi3g.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
---
 arch/arm/boot/dts/overlays/Makefile           |  1 +
 arch/arm/boot/dts/overlays/README             |  8 ++++
 .../boot/dts/overlays/tpm-slb9670-overlay.dts | 44 +++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/tpm-slb9670-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -137,6 +137,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	tc358743.dtbo \
 	tc358743-audio.dtbo \
 	tinylcd35.dtbo \
+	tpm-slb9670.dtbo \
 	uart0.dtbo \
 	uart1.dtbo \
 	upstream.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2012,6 +2012,14 @@ Params: speed                   Display
                 dtoverlay=tinylcd35,touch,touchgpio=3
 
 
+Name:   tpm-slb9670
+Info:   Enables support for Infineon SLB9670 Trusted Platform Module add-on
+        boards, which can be used as a secure key storage and hwrng,
+        available as "Iridium SLB9670" by Infineon and "LetsTrust TPM" by pi3g.
+Load:   dtoverlay=tpm-slb9670
+Params: <None>
+
+
 Name:   uart0
 Info:   Change the pin usage of uart0
 Load:   dtoverlay=uart0,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/tpm-slb9670-overlay.dts
@@ -0,0 +1,44 @@
+/*
+ * Device Tree overlay for the Infineon SLB9670 Trusted Platform Module add-on
+ * boards, which can be used as a secure key storage and hwrng.
+ * available as "Iridium SLB9670" by Infineon and "LetsTrust TPM" by pi3g.
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+	fragment@0 {
+		target = <&spi0>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target = <&spidev1>;
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+
+	fragment@2 {
+		target = <&spi0>;
+		__overlay__ {
+			/* needed to avoid dtc warning */
+			#address-cells = <1>;
+			#size-cells = <0>;
+			slb9670: slb9670@1 {
+				compatible = "infineon,slb9670";
+				reg = <1>;	/* CE1 */
+				#address-cells = <1>;
+				#size-cells = <0>;
+				spi-max-frequency = <32000000>;
+				status = "okay";
+			};
+
+		};
+	};
+};