3370e10495
Some systems require multiple flash chips to be concatenated and read as
a single mtd device. The ar71xx target provides custom code to create
such mtdconcat devices. When porting devices to ath79, however, there is
no way to create such devices from within the device tree.
This commit adds a driver for creating virtual mtd-concat devices to the
ath79 target. Nodes must have a compatible = "virtual,mtd-concat" line,
and define a list of devices to concat in the 'devices' property,
for example:
flash {
compatible = "virtual,mtd-concat";
devices = <&flash0 &flash1>;
};
The driver is added to the very end of the mtd Makefile to increase the
likelyhood of all child devices already being loaded at the time of
probing, preventing unnecessary deferred probes which might in turn
cause other problems (like failure to load MAC addresses from art because
the partitions are not loaded yet).
Signed-off-by: Bernhard Frauendienst <openwrt@nospam.obeliks.de>
58 lines
1.3 KiB
Diff
58 lines
1.3 KiB
Diff
From 5734c6669fba7ddb5ef491ccff7159d15dba0b59 Mon Sep 17 00:00:00 2001
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From: Bernhard Frauendienst <kernel@nospam.obeliks.de>
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Date: Wed, 5 Sep 2018 01:32:51 +0200
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Subject: [PATCH 496/497] dt-bindings: add bindings for mtd-concat devices
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Document virtual mtd-concat device bindings.
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Signed-off-by: Bernhard Frauendienst <kernel@nospam.obeliks.de>
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---
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.../devicetree/bindings/mtd/mtd-concat.txt | 36 +++++++++++++++++++
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1 file changed, 36 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/mtd/mtd-concat.txt
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diff --git a/Documentation/devicetree/bindings/mtd/mtd-concat.txt b/Documentation/devicetree/bindings/mtd/mtd-concat.txt
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new file mode 100644
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index 000000000000..2daf3157b163
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/mtd/mtd-concat.txt
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@@ -0,0 +1,36 @@
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+Virtual MTD concat device
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+
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+Requires properties:
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+- devices: list of phandles to mtd nodes that should be concatenated
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+
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+Example:
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+
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+&spi {
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+ flash0: flash@0 {
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+ ...
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+ };
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+ flash1: flash@1 {
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+ ...
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+ };
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+};
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+
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+flash {
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+ compatible = "mtd-concat";
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+
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+ devices = <&flash0 &flash1>;
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+
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+ partitions {
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+ compatible = "fixed-partitions";
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+
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+ partition@0 {
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+ label = "boot";
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+ reg = <0x0000000 0x0040000>;
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+ read-only;
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+ };
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+
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+ partition@40000 {
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+ label = "firmware";
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+ reg = <0x0040000 0x1fc0000>;
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+ };
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+ }
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+}
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--
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2.18.0
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