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From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Mark Rutland <mark.rutland@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Chen-Yu Tsai <wens@csie.org>,
	Maxime Ripard <maxime.ripard@bootlin.com>
Cc: devicetree@vger.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Arnd Bergmann <arnd@arndb.de>,
	dri-devel@lists.freedesktop.org,
	Georgi Djakov <georgi.djakov@linaro.org>,
	Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	Yong Deng <yong.deng@magewell.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Dave Martin <dave.martin@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 2/7] dt-bindings: bus: Add binding for the Allwinner MBUS controller
Date: Mon, 11 Feb 2019 16:02:50 +0100	[thread overview]
Message-ID: <43f965dae8b0ba8dffd3af478c2836c17feaa18b.1549897336.git-series.maxime.ripard@bootlin.com> (raw)
In-Reply-To: <cover.f2e5fbb4d21384168973fa32377a33d627768146.1549897336.git-series.maxime.ripard@bootlin.com>

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.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
 Documentation/devicetree/bindings/arm/sunxi/sunxi-mbus.txt | 36 +++++++-
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/sunxi/sunxi-mbus.txt

diff --git a/Documentation/devicetree/bindings/arm/sunxi/sunxi-mbus.txt b/Documentation/devicetree/bindings/arm/sunxi/sunxi-mbus.txt
new file mode 100644
index 000000000000..e72b7ac9e359
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/sunxi/sunxi-mbus.txt
@@ -0,0 +1,36 @@
+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 booting-without-of.txt
+ - #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" 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";
+};
-- 
git-series 0.9.1

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  parent reply	other threads:[~2019-02-11 15:03 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-11 15:02 [PATCH v3 0/7] sunxi: Add DT representation for the MBUS controller Maxime Ripard
2019-02-11 15:02 ` [PATCH v3 1/7] dt-bindings: interconnect: Add a dma interconnect name Maxime Ripard
2019-03-01 17:48   ` Georgi Djakov
2019-03-05 15:53     ` Maxime Ripard
2019-03-05 16:14       ` Robin Murphy
2019-03-07 15:15         ` Georgi Djakov
2019-03-07 15:47           ` Maxime Ripard
2019-03-07 16:09             ` Chen-Yu Tsai
2019-03-11 10:11               ` Maxime Ripard
2019-03-11 14:11                 ` Chen-Yu Tsai
2019-03-13 11:48                 ` Georgi Djakov
2019-02-11 15:02 ` Maxime Ripard [this message]
2019-02-12 18:53   ` [PATCH v3 2/7] dt-bindings: bus: Add binding for the Allwinner MBUS controller Robin Murphy
2019-02-11 15:02 ` [PATCH v3 3/7] of: address: Add parent pointer to the __of_translate_address args Maxime Ripard
2019-02-12 18:02   ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 4/7] of: address: Add support for the parent DMA bus Maxime Ripard
2019-02-12 18:15   ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 5/7] drm/sun4i: Rely on dma interconnect for our RAM offset Maxime Ripard
2019-02-12 18:46   ` Robin Murphy
2019-02-13 15:41     ` Maxime Ripard
2019-02-13 16:40       ` Robin Murphy
2019-02-19 10:55         ` Maxime Ripard
2019-03-05 16:11           ` Robin Murphy
2019-02-11 15:02 ` [PATCH v3 6/7] clk: sunxi-ng: sun5i: Export the MBUS clock Maxime Ripard
2019-02-11 15:02 ` [PATCH v3 7/7] ARM: dts: sun5i: Add the MBUS controller Maxime Ripard

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