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authorSascha Hauer <s.hauer@pengutronix.de>2019-06-05 00:06:30 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2019-06-11 09:11:11 +0200
commit796af3473b8222bcd89aa63e9886c355a6baf95d (patch)
treead357b2756bda409b46747faaaf57a0ffd003c9c /dts/Bindings/arm/sunxi
parent649b9ebcf53d697277bcdb01334dbcd563a33aa8 (diff)
downloadbarebox-796af3473b8222bcd89aa63e9886c355a6baf95d.tar.gz
barebox-796af3473b8222bcd89aa63e9886c355a6baf95d.tar.xz
dts: update to v5.2-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/arm/sunxi')
-rw-r--r--dts/Bindings/arm/sunxi/sunxi-mbus.txt36
1 files changed, 36 insertions, 0 deletions
diff --git a/dts/Bindings/arm/sunxi/sunxi-mbus.txt b/dts/Bindings/arm/sunxi/sunxi-mbus.txt
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+Allwinner Memory Bus (MBUS) controller
+
+The MBUS controller drives the MBUS that other devices in the SoC will
+use to perform DMA. It also has a register interface that allows to
+monitor and control the bandwidth and priorities for masters on that
+bus.
+
+Required properties:
+ - compatible: Must be one of:
+ - allwinner,sun5i-a13-mbus
+ - reg: Offset and length of the register set for the controller
+ - clocks: phandle to the clock driving the controller
+ - dma-ranges: See section 2.3.9 of the DeviceTree Specification
+ - #interconnect-cells: Must be one, with the argument being the MBUS
+ port ID
+
+Each device having to perform their DMA through the MBUS must have the
+interconnects and interconnect-names properties set to the MBUS
+controller and with "dma-mem" as the interconnect name.
+
+Example:
+
+mbus: dram-controller@1c01000 {
+ compatible = "allwinner,sun5i-a13-mbus";
+ reg = <0x01c01000 0x1000>;
+ clocks = <&ccu CLK_MBUS>;
+ dma-ranges = <0x00000000 0x40000000 0x20000000>;
+ #interconnect-cells = <1>;
+};
+
+fe0: display-frontend@1e00000 {
+ compatible = "allwinner,sun5i-a13-display-frontend";
+ ...
+ interconnects = <&mbus 19>;
+ interconnect-names = "dma-mem";
+};