gnu: raspberry-pi: New make-raspi-bcm28-dtbs procedure.

* gnu/packages/raspberry-pi.scm (make-raspi-bcm28-dtbs): New procedure.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/packages/raspberry-pi.scm

@@ -30,6 +30,7 @@
   #:use-module (gnu packages file)
   #:use-module (gnu packages gcc)
   #:use-module (gnu packages linux)
+  #:use-module (guix build-system copy)
   #:use-module (guix build-system gnu)
   #:use-module (guix download)
   #:use-module (guix git-download)
@@ -43,7 +44,8 @@
   #:use-module (srfi srfi-2)
   #:use-module (srfi srfi-26)
   #:use-module (ice-9 match)
-  #:export (raspi-config-file
+  #:export (make-raspi-bcm28-dtbs
+            raspi-config-file
             raspi-custom-txt))
 
 (define-public bcm2835
@@ -293,6 +295,27 @@ CONTENT can be a list of strings, which are concatenated with a newline
 character.  Alternatively CONTENT can be a string with the full file content."
   (raspi-config-file "custom.txt" content))
 
+(define (make-raspi-bcm28-dtbs linux)
+  "Make a package with the device-tree files for Raspberry Pi models from the
+kernel LINUX."
+  (package
+    (inherit linux)
+    (name "raspi-bcm28-dtbs")
+    (source #f)
+    (build-system copy-build-system)
+    (arguments
+     #~(list
+        #:phases #~(modify-phases %standard-phases (delete 'unpack))
+        #:install-plan
+        (list (list (search-input-directory %build-inputs
+                                            "lib/dtbs/broadcom/")
+                    "." #:include-regexp '("/bcm....-rpi.*\\.dtb")))))
+    (inputs (list linux))
+    (synopsis "Device-tree files for a Raspberry Pi")
+    (description
+     (format #f "The device-tree files for Raspberry Pi models from ~a."
+             (package-name linux)))))
+
 (define (make-raspi-defconfig arch defconfig sha256-as-base32)
   "Make for the architecture ARCH a file-like object from the DEFCONFIG file
 with the hash SHA256-AS-BASE32.  This object can be used as the #:defconfig