ARM: dts: Add Facebook BMC 128MB flash layout

This is the layout used by Facebook BMC systems. It describes the fixed
flash layout of a 128MB mtd device.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20210805222818.8391-2-rentao.bupt@gmail.com
Signed-off-by: Joel Stanley <joel@jms.id.au>

diff --git a/arch/arm/boot/dts/facebook-bmc-flash-layout-128.dtsi b/arch/arm/boot/dts/facebook-bmc-flash-layout-128.dtsi
new file mode 100644 (file)
index 0000000..7f3652d
--- /dev/null
+++ b/arch/arm/boot/dts/facebook-bmc-flash-layout-128.dtsi
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright (c) 2020 Facebook Inc.
+
+partitions {
+       compatible = "fixed-partitions";
+       #address-cells = <1>;
+       #size-cells = <1>;
+
+       /*
+        * u-boot partition: 896KB.
+        */
+       u-boot@0 {
+               reg = <0x0 0xe0000>;
+               label = "u-boot";
+       };
+
+       /*
+        * u-boot environment variables: 64KB.
+        */
+       u-boot-env@e0000 {
+               reg = <0xe0000 0x10000>;
+               label = "env";
+       };
+
+       /*
+        * image metadata partition (64KB), used by Facebook internal
+        * tools.
+        */
+       image-meta@f0000 {
+               reg = <0xf0000 0x10000>;
+               label = "meta";
+       };
+
+       /*
+        * FIT image: 119 MB.
+        */
+       fit@100000 {
+               reg = <0x100000 0x7700000>;
+               label = "fit";
+       };
+
+       /*
+        * "data0" partition (8MB) is used by Facebook BMC platforms as
+        * persistent data store.
+        */
+       data0@7800000 {
+               reg = <0x7800000 0x800000>;
+               label = "data0";
+       };
+
+       /*
+        * Although the master partition can be created by enabling
+        * MTD_PARTITIONED_MASTER option, below "flash0" partition is
+        * explicitly created to avoid breaking legacy applications.
+        */
+       flash0@0 {
+               reg = <0x0 0x8000000>;
+               label = "flash0";
+       };
+};