target/linux/bcm27xx/patches-6.1/950-0519-overlays-Add-disable-emmc2.patch

   1 From 138d3b64a111b52f2cfe42c3ef84283bd281fae4 Mon Sep 17 00:00:00 2001
   2 From: Tim Gover <tim.gover@raspberrypi.com>
   3 Date: Fri, 16 Dec 2022 15:51:17 +0000
   4 Subject: [PATCH] overlays: Add disable-emmc2
   5
   6 Add a new overlay that disables the EMMC2 controller on BCM2711.
   7 This can be useful on a Compute Module 4 if the onboard EMMC2
   8 storage is unreliable and the system can be booted by other
   9 means e.g Network / USB.
  10
  11 Signed-off-by: Tim Gover <tim.gover@raspberrypi.com>
  12 ---
  13  arch/arm/boot/dts/overlays/Makefile                 |  1 +
  14  arch/arm/boot/dts/overlays/README                   |  8 ++++++++
  15  .../arm/boot/dts/overlays/disable-emmc2-overlay.dts | 13 +++++++++++++
  16  arch/arm/boot/dts/overlays/overlay_map.dts          |  4 ++++
  17  4 files changed, 26 insertions(+)
  18  create mode 100644 arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts
  19
  20 --- a/arch/arm/boot/dts/overlays/Makefile
  21 +++ b/arch/arm/boot/dts/overlays/Makefile
  22 @@ -49,6 +49,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  23         dionaudio-loco.dtbo \
  24         dionaudio-loco-v2.dtbo \
  25         disable-bt.dtbo \
  26 +       disable-emmc2.dtbo \
  27         disable-wifi.dtbo \
  28         dpi18.dtbo \
  29         dpi18cpadhi.dtbo \
  30 --- a/arch/arm/boot/dts/overlays/README
  31 +++ b/arch/arm/boot/dts/overlays/README
  32 @@ -895,6 +895,14 @@ Load:   dtoverlay=disable-bt
  33  Params: <None>
  34
  35
  36 +Name:   disable-emmc2
  37 +Info:   Disable EMMC2 controller on BCM2711.
  38 +        The allows the onboard EMMC storage on Compute Module 4 to be disabled
  39 +        e.g. if a fault has occurred.
  40 +Load:   dtoverlay=disable-emmc2
  41 +Params: <None>
  42 +
  43 +
  44  Name:   disable-wifi
  45  Info:   Disable onboard WLAN on Pi 3B, 3B+, 3A+, 4B and Zero W.
  46  Load:   dtoverlay=disable-wifi
  47 --- /dev/null
  48 +++ b/arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts
  49 @@ -0,0 +1,13 @@
  50 +/dts-v1/;
  51 +/plugin/;
  52 +
  53 +/{
  54 +       compatible = "brcm,bcm2711";
  55 +
  56 +       fragment@0 {
  57 +               target = <&emmc2>;
  58 +               __overlay__ {
  59 +                       status = "disabled";
  60 +               };
  61 +       };
  62 +};
  63 --- a/arch/arm/boot/dts/overlays/overlay_map.dts
  64 +++ b/arch/arm/boot/dts/overlays/overlay_map.dts
  65 @@ -9,6 +9,10 @@
  66                 bcm2711;
  67         };
  68
  69 +       disable-emmc2 {
  70 +               bcm2711;
  71 +       };
  72 +
  73         highperi {
  74                 bcm2711;
  75         };