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From 138d3b64a111b52f2cfe42c3ef84283bd281fae4 Mon Sep 17 00:00:00 2001
From: Tim Gover <tim.gover@raspberrypi.com>
Date: Fri, 16 Dec 2022 15:51:17 +0000
Subject: [PATCH] overlays: Add disable-emmc2
Add a new overlay that disables the EMMC2 controller on BCM2711.
This can be useful on a Compute Module 4 if the onboard EMMC2
storage is unreliable and the system can be booted by other
means e.g Network / USB.
Signed-off-by: Tim Gover <tim.gover@raspberrypi.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 8 ++++++++
.../arm/boot/dts/overlays/disable-emmc2-overlay.dts | 13 +++++++++++++
arch/arm/boot/dts/overlays/overlay_map.dts | 4 ++++
4 files changed, 26 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -49,6 +49,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
dionaudio-loco.dtbo \
dionaudio-loco-v2.dtbo \
disable-bt.dtbo \
+ disable-emmc2.dtbo \
disable-wifi.dtbo \
dpi18.dtbo \
dpi18cpadhi.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -895,6 +895,14 @@ Load: dtoverlay=disable-bt
Params: <None>
+Name: disable-emmc2
+Info: Disable EMMC2 controller on BCM2711.
+ The allows the onboard EMMC storage on Compute Module 4 to be disabled
+ e.g. if a fault has occurred.
+Load: dtoverlay=disable-emmc2
+Params: <None>
+
+
Name: disable-wifi
Info: Disable onboard WLAN on Pi 3B, 3B+, 3A+, 4B and Zero W.
Load: dtoverlay=disable-wifi
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/disable-emmc2-overlay.dts
@@ -0,0 +1,13 @@
+/dts-v1/;
+/plugin/;
+
+/{
+ compatible = "brcm,bcm2711";
+
+ fragment@0 {
+ target = <&emmc2>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+};
--- a/arch/arm/boot/dts/overlays/overlay_map.dts
+++ b/arch/arm/boot/dts/overlays/overlay_map.dts
@@ -9,6 +9,10 @@
bcm2711;
};
+ disable-emmc2 {
+ bcm2711;
+ };
+
highperi {
bcm2711;
};
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