[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20221022211318.32009-1-zajec5@gmail.com>
Date: Sat, 22 Oct 2022 23:13:17 +0200
From: Rafał Miłecki <zajec5@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Mikhail Zhilkin <csharper2005@...il.com>,
Christian Marangi <ansuelsmth@...il.com>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
Chaitanya Kulkarni <kch@...dia.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
Jens Axboe <axboe@...nel.dk>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH V3 1/2] dt-bindings: mtd: partitions: support marking rootfs partition
From: Rafał Miłecki <rafal@...ecki.pl>
Linux needs to know what to use as root device. On embedded devices with
flash the only common way to specify that is cmdline & root= parameter.
That solution works with U-Boot which is Linux & cmdline aware but isn't
available with all market bootloaders. Also that method is fragile:
1. Requires specific probing order on multi-flash devices
2. Uses hardcoded partitions indexes
A lot of devices use different partitioning methods. It may be
"fixed-partitions" or some dynamic partitioning (e.g. based on parts
table). For such cases allow "linux,rootfs" property to mark correct
flash partition.
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
V2: Use "linux,rootfs" as more accurate. Thanks Rob.
---
.../devicetree/bindings/mtd/partitions/fixed-partitions.yaml | 1 +
.../devicetree/bindings/mtd/partitions/partition.yaml | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
index ad3ccd250802..d66a6e3bcb56 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
@@ -84,6 +84,7 @@ examples:
partition@0 {
label = "filesystem";
reg = <0x00000000 0x1 0x00000000>;
+ linux,rootfs;
};
};
diff --git a/Documentation/devicetree/bindings/mtd/partitions/partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
index f1a02d840b12..a25cd23a34c0 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
@@ -52,6 +52,10 @@ properties:
immune to paired-pages corruptions
type: boolean
+ linux,rootfs:
+ description: Marks partition that contains root filesystem to mount and boot
+ user space from
+
if:
not:
required: [ reg ]
--
2.34.1
Powered by blists - more mailing lists