target/linux/bcm27xx/patches-6.1/950-0850-overlays-Add-a-sample-hat_map.patch

   1 From cc08810f89e52337a99cc6ae5f53f08588357c5f Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Tue, 19 Sep 2023 20:31:34 +0100
   4 Subject: [PATCH] overlays: Add a sample hat_map
   5
   6 The HAT map is way of associating named overlays with HATs whose
   7 EEPROMs were programmed with the contents of the overlay.
   8 Unfortunately, change in the DT and kernel drivers has meant that some
   9 of these embedded overlays no longer function, or even don't apply.
  10
  11 The HAT map is a mapping from HAT UUIDs to overlay names. If a HAT with
  12 a listed UUID is detected, the embedded overlay is ignored and the
  13 overlay named in the mapping is loaded in its place.
  14
  15 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  16 ---
  17  arch/arm/boot/dts/overlays/Makefile    |  2 +-
  18  arch/arm/boot/dts/overlays/hat_map.dts | 13 +++++++++++++
  19  2 files changed, 14 insertions(+), 1 deletion(-)
  20  create mode 100644 arch/arm/boot/dts/overlays/hat_map.dts
  21
  22 --- a/arch/arm/boot/dts/overlays/Makefile
  23 +++ b/arch/arm/boot/dts/overlays/Makefile
  24 @@ -1,6 +1,6 @@
  25  # Overlays for the Raspberry Pi platform
  26
  27 -dtb-$(CONFIG_ARCH_BCM2835) += overlay_map.dtb
  28 +dtb-$(CONFIG_ARCH_BCM2835) += overlay_map.dtb hat_map.dtb
  29
  30  dtbo-$(CONFIG_ARCH_BCM2835) += \
  31         act-led.dtbo \
  32 --- /dev/null
  33 +++ b/arch/arm/boot/dts/overlays/hat_map.dts
  34 @@ -0,0 +1,13 @@
  35 +/dts-v1/;
  36 +
  37 +/ {
  38 +       iqaudio-pi-codecplus {
  39 +               uuid = [ dc1c9594 c1ab 4c6c acda a88dc59a3c5b ];
  40 +               overlay = "iqaudio-codec";
  41 +       };
  42 +
  43 +       recalbox-rgbdual {
  44 +               uuid = [ 1c955808 681f 4bbc a2ef b7ea47cd388e ];
  45 +               overlay = "recalboxrgbdual";
  46 +       };
  47 +};