linux-kernel - [PATCH v5 17/22] dt-bindings: media: Document bindings for the Sunxi-Cedrus VPU driver

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Message-Id: <20180710080114.31469-18-paul.kocialkowski@bootlin.com>
Date:   Tue, 10 Jul 2018 10:01:09 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Marco Franchi <marco.franchi@....com>,
        Icenowy Zheng <icenowy@...c.io>,
        Hans Verkuil <hverkuil@...all.nl>,
        Keiichi Watanabe <keiichiw@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Smitha T Murthy <smitha.t@...sung.com>,
        Tom Saeger <tom.saeger@...cle.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacob Chen <jacob-chen@...wrt.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Benoit Parrot <bparrot@...com>,
        Todor Tomov <todor.tomov@...aro.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Pawel Osciak <posciak@...omium.org>,
        Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        linux-sunxi@...glegroups.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Randy Li <ayaka@...lik.info>
Subject: [PATCH v5 17/22] dt-bindings: media: Document bindings for the Sunxi-Cedrus VPU driver

This adds a device-tree binding document that specifies the properties
used by the Sunxi-Cedurs VPU driver, as well as examples.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 .../bindings/media/sunxi-cedrus.txt           | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/sunxi-cedrus.txt

diff --git a/Documentation/devicetree/bindings/media/sunxi-cedrus.txt b/Documentation/devicetree/bindings/media/sunxi-cedrus.txt
new file mode 100644
index 000000000000..a089a0c1ff05
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/sunxi-cedrus.txt
@@ -0,0 +1,54 @@
+Device-tree bindings for the VPU found in Allwinner SoCs, referred to as the
+Video Engine (VE) in Allwinner literature.
+
+The VPU can only access the first 256 MiB of DRAM, that are DMA-mapped starting
+from the DRAM base. This requires specific memory allocation and handling.
+
+Required properties:
+- compatible		: must be one of the following compatibles:
+			- "allwinner,sun4i-a10-video-engine"
+			- "allwinner,sun5i-a13-video-engine"
+			- "allwinner,sun7i-a20-video-engine"
+			- "allwinner,sun8i-a33-video-engine"
+			- "allwinner,sun8i-h3-video-engine"
+- reg			: register base and length of VE;
+- clocks		: list of clock specifiers, corresponding to entries in
+			  the clock-names property;
+- clock-names		: should contain "ahb", "mod" and "ram" entries;
+- resets		: phandle for reset;
+- interrupts		: VE interrupt number;
+- allwinner,sram	: SRAM region to use with the VE.
+
+Optional properties:
+- memory-region		: CMA pool to use for buffers allocation instead of the
+			  default CMA pool.
+
+Example:
+
+reserved-memory {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	ranges;
+
+	/* Address must be kept in the lower 256 MiBs of DRAM for VE. */
+	cma_pool: cma@...00000 {
+		compatible = "shared-dma-pool";
+		size = <0x6000000>;
+		alloc-ranges = <0x4a000000 0x6000000>;
+		reusable;
+		linux,cma-default;
+	};
+};
+
+video-codec@...e000 {
+	compatible = "allwinner,sun7i-a20-video-engine";
+	reg = <0x01c0e000 0x1000>;
+
+	clocks = <&ccu CLK_AHB_VE>, <&ccu CLK_VE>,
+		 <&ccu CLK_DRAM_VE>;
+	clock-names = "ahb", "mod", "ram";
+
+	resets = <&ccu RST_VE>;
+	interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;
+	allwinner,sram = <&ve_sram 1>;
+};
-- 
2.17.1