linux-kernel - [PATCH 1/5] dt-bindings: media: Add Allwinner A10 CSI binding

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Date:   Tue, 13 Nov 2018 09:24:13 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, Andrzej Hajda <a.hajda@...sung.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: [PATCH 1/5] dt-bindings: media: Add Allwinner A10 CSI binding

The Allwinner A10 CMOS Sensor Interface is a camera capture interface also
used in later (A10s, A13, A20, R8 and GR8) SoCs.

On some SoCs, like the A10, there's multiple instances of that controller,
with one instance supporting more channels and having an ISP.

Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
---
 Documentation/devicetree/bindings/media/sun4i-csi.txt | 71 ++++++++++++-
 1 file changed, 71 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/sun4i-csi.txt

diff --git a/Documentation/devicetree/bindings/media/sun4i-csi.txt b/Documentation/devicetree/bindings/media/sun4i-csi.txt
new file mode 100644
index 000000000000..3d96bcbef9d9
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/sun4i-csi.txt
@@ -0,0 +1,71 @@
+Allwinner A10 CMOS Sensor Interface
+-------------------------------------
+
+The Allwinner A10 SoC features two camera capture interfaces, one
+featuring an ISP and the other without. Later SoCs built upon that
+design and used similar SoCs.
+
+Required properties:
+  - compatible: value must be one of:
+    * allwinner,sun4i-a10-csi
+    * allwinner,sun5i-a13-csi, allwinner,sun4i-a10-csi
+    * allwinner,sun7i-a20-csi, allwinner,sun4i-a10-csi
+  - reg: base address and size of the memory-mapped region.
+  - interrupts: interrupt associated to this IP
+  - clocks: phandles to the clocks feeding the CSI
+    * ahb: the CSI interface clock
+    * mod: the CSI module clock
+    * ram: the CSI DRAM clock
+  - clock-names: the clock names mentioned above
+  - resets: phandles to the reset line driving the CSI
+
+Optional properties:
+  - allwinner,csi-channels: Number of channels available in the CSI
+                            controller. If not present, the default
+                            will be 1.
+  - allwinner,has-isp: Whether the CSI controller has an ISP
+                       associated to it or not
+
+If allwinner,has-isp is set, an additional "isp" clock is needed,
+being a phandle to the clock driving the ISP.
+
+The CSI node should contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt. The
+endpoint's bus type must be parallel or BT656.
+
+Endpoint node properties for CSI
+---------------------------------
+
+- remote-endpoint	: (required) a phandle to the bus receiver's endpoint
+			   node
+- bus-width:		: (required) must be 8
+- pclk-sample		: (optional) (default: sample on falling edge)
+- hsync-active		: (only required for parallel)
+- vsync-active		: (only required for parallel)
+
+Example:
+
+csi0: csi@...9000 {
+	compatible = "allwinner,sun7i-a20-csi",
+		     "allwinner,sun4i-a10-csi";
+	reg = <0x01c09000 0x1000>;
+	interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
+	clocks = <&ccu CLK_AHB_CSI0>, <&ccu CLK_CSI0>,
+		 <&ccu CLK_CSI_SCLK>, <&ccu CLK_DRAM_CSI0>;
+	clock-names = "ahb", "mod", "isp", "ram";
+	resets = <&ccu RST_CSI0>;
+	allwinner,csi-channels = <4>;
+	allwinner,has-isp;
+	
+	port {
+		csi_from_ov5640: endpoint {
+                        remote-endpoint = <&ov5640_to_csi>;
+                        bus-width = <8>;
+                        data-shift = <2>;
+                        hsync-active = <1>; /* Active high */
+                        vsync-active = <0>; /* Active low */
+                        pclk-sample = <1>;  /* Rising */
+                };
+	};
+};
-- 
git-series 0.9.1