11 files changed, 99 insertions, 25 deletions
diff --git a/README b/README
index 1a4debd..6167976 100644
--- a/README
+++ b/README
@@ -11,9 +11,6 @@ See this for the format of an overlay:
 
 https://www.kernel.org/doc/Documentation/devicetree/overlay-notes.txt
 
-Note that as of 10 May 2019, no overlays have been
-released.
-
 The biggest flaw in overlays, is the inablitiy to use
 the phandle described in an alias in the boot
 time device tree in an overlay, so it appears
@@ -23,3 +20,25 @@ is common to reference a "pio" in device tree to
 use a PIO with GPIO.  For example, it does not appear
 to be possible to use &pioC in the overlay without
 redefining it.
+
+The recipe that uses the overlay reads a comment
+in the overlay source to determine the destination
+and any symlink locations.
+
+The comment in the file must be as follows for
+locations and symlinks:
+
+/*
+ * Put:     /a/b/c/d.dtbo
+ * Link:    /a/x/y/d.dtbo
+ *
+ */
+
+The install is looking for a line that
+starts with " * Put:  " or " * Link: ".
+Extra spaces before the path are allowed.
+The link will always point at the path
+specified by Put.
+
+The path given is relative to the device
+tree overlay location.
diff --git a/mtcap/MTCAP-0.3-pps.dtso b/mtcap/MTCAP-0.3-gps-pps.dtso
index 6b89e65..40e50b1 100644
--- a/mtcap/MTCAP-0.3-pps.dtso
+++ b/mtcap/MTCAP-0.3-gps-pps.dtso
@@ -6,6 +6,16 @@
  * Licensed under GPLv2 or later.
  */
 
+/*
+ * The example symlink below is purposely mis-spelled to
+ * disable the link install.
+ * A symlink line must start with "* Link: "
+ * Location(s):
+ * Put:  MTCAP/0.3/capability/gps/pps.dtbo
+ * LiNk: MTCAP/0.4/capability/gps/pps.dtbo
+ * LiNk: MTCAP/0.5/capability/gps/pps.dtbo
+ */
+
 /dts-v1/;
 
 / {
diff --git a/mtcap/MTCAP-0.3-gps-uart0.dtso b/mtcap/MTCAP-0.3-gps-uart0.dtso
new file mode 100644
index 0000000..c72b9a3
--- /dev/null
+++ b/mtcap/MTCAP-0.3-gps-uart0.dtso
@@ -0,0 +1,30 @@
+/*
+ * DTS file for Multi-Tech Systems MTCAP 0.3 Hardware
+ *
+ * Copyright (C) 2019 by Multi-Tech Systems,
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+/*
+ * The example symlink below is purposely mis-spelled to
+ * disable the link install.
+ * A symlink line must start with "* Link: "
+ * Location(s):
+ * Put:  MTCAP/0.3/capability/gps/uart0.dtbo
+ * LiNk: MTCAP/0.4/capability/gps/uart0.dtbo
+ * LiNk: MTCAP/0.5/capability/gps/uart0.dtbo
+ */
+
+/dts-v1/;
+
+/ {
+    model = "Multi-Tech Systems MTCAP-0.3";
+    compatible = "atmel,at91sam9g25ek", "atmel,at91sam9x5ek", "atmel,at91sam9x5", "atmel,at91sam9";
+    fragment@1 {
+        target-path = "/ahb/apb/serial@f8040000";
+        __overlay__ {
+            status = "okay";
+        };
+    }; /* fragment@1 */
+};
diff --git a/mtcdt/alt-mtcdt-0.0.dtso b/mtcdt/alt-mtcdt-0.0.dtso
index 3e585d2..3f51855 100644
--- a/mtcdt/alt-mtcdt-0.0.dtso
+++ b/mtcdt/alt-mtcdt-0.0.dtso
@@ -1,6 +1,12 @@
 /*
  * DTS overlay for MTCDT 0.0 hardware version.
  */
+
+/*
+ * Location(s):
+ * Put:  MTCDT/0.0/alt-mtcdt.dtbo
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/mtcdt/ap1-xdot-0.0.dtso b/mtcdt/ap1-xdot-0.0.dtso
index 969f8b1..d127e60 100644
--- a/mtcdt/ap1-xdot-0.0.dtso
+++ b/mtcdt/ap1-xdot-0.0.dtso
@@ -4,6 +4,11 @@
 /dts-v1/;
 /plugin/;
 
+/*
+ * Location(s):
+ * Put:  MTCDT/0.0/ap1-xdot.dtbo
+ */
+
 #include <dt-bindings/dma/at91.h>
 #include <dt-bindings/pinctrl/at91.h>
 #include <dt-bindings/interrupt-controller/irq.h>
diff --git a/mtcdt/ap2-xdot-0.0.dtso b/mtcdt/ap2-xdot-0.0.dtso
index 908e6ad..0e53309 100644
--- a/mtcdt/ap2-xdot-0.0.dtso
+++ b/mtcdt/ap2-xdot-0.0.dtso
@@ -1,6 +1,12 @@
 /*
  * DTS overlay for MTCDT 0.0 hardware version.
  */
+
+/*
+ * Location(s):
+ * Put:  MTCDT/0.0/ap2-xdot.dtbo
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/mtcdt/mtcdt-0.0.dtso b/mtcdt/mtcdt-0.0.dtso
index 4d98fa4..e88d0d2 100644
--- a/mtcdt/mtcdt-0.0.dtso
+++ b/mtcdt/mtcdt-0.0.dtso
@@ -1,6 +1,12 @@
 /*
  * DTS overlay for MTCDT 0.0 hardware version.
  */
+
+/*
+ * Location(s):
+ * Put:  MTCDT/0.0/mtcdt.dtbo
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/mtcdt/mtcdt-gpios.0.0.dtso b/mtcdt/mtcdt-gpios.0.0.dtso
index 24b1332..6234b30 100644
--- a/mtcdt/mtcdt-gpios.0.0.dtso
+++ b/mtcdt/mtcdt-gpios.0.0.dtso
@@ -3,6 +3,12 @@
  * Uses [name]-gpios from:
  * https://www.kernel.org/doc/Documentation/devicetree/bindings/gpio/gpio.txt
  */
+
+/*
+ * Location(s):
+ * Put:  MTCDT/0.0/gpios.dtbo
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/mtrv1/MTRV1-0.0-pps.dtso b/mtrv1/MTRV1-0.0-pps.dtso
index b3e1591..966ede6 100644
--- a/mtrv1/MTRV1-0.0-pps.dtso
+++ b/mtrv1/MTRV1-0.0-pps.dtso
@@ -6,6 +6,14 @@
  * Licensed under GPLv2 or later.
  */
 
+/*
+ * A symlink line must start with "* Link: "
+ * Location(s):
+ * Put:  MTRV1/0.0/capability/gps/gnss.dtbo
+ * Link: MTRV1/0.4/capability/gps/gnss.dtbo
+ * Link: MTRV1/0.5/capability/gps/gnss.dtbo
+ */
+
 /dts-v1/;
 /plugin/;
 
diff --git a/mtrv1/MTRV1-0.1-pps.dtso b/mtrv1/MTRV1-0.1-pps.dtso
deleted file mode 100644
index ad90ba8..0000000
--- a/mtrv1/MTRV1-0.1-pps.dtso
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * DTS file for Multi-Tech Systems MTRv1 Hardware
- *
- * Copyright (C) 2019 by Multi-Tech Systems,
- *
- * Licensed under GPLv2 or later.
- */
-
-/dts-v1/;
-/plugin/;
-
-/ {
-    model = "Multi-Tech Systems MTRV1-0.1";
-    compatible = "atmel,at91sam9g25ek", "atmel,at91sam9x5ek", "atmel,at91sam9x5", "atmel,at91sam9";
-    fragment@0 {
-        target-path = "/pps-1";
-        __overlay__ {
-            status = "okay";
-        };
-    }; /* fragment@0 */
-};
diff --git a/mtrv1/MTRV1-0.2-pps.dtbo b/mtrv1/MTRV1-0.2-pps.dtbo
deleted file mode 120000
index c4639fc..0000000
--- a/mtrv1/MTRV1-0.2-pps.dtbo
+++ /dev/null
@@ -1 +0,0 @@
-MTRV1-0.1-pps.dtbo
-\ No newline at end of file