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From f62b05e593e28e7ed00d25318bd301bb5470de63 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 31 Oct 2018 14:59:06 +0000
Subject: [PATCH] dt-bindings: Document BCM283x CSI2/CCP2 receiver
Document the DT bindings for the CSI2/CCP2 receiver peripheral
(known as Unicam) on BCM283x SoCs.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Acked-by: Rob Herring <robh@kernel.org>
---
.../bindings/media/bcm2835-unicam.txt | 85 +++++++++++++++++++
1 file changed, 85 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/bcm2835-unicam.txt
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/bcm2835-unicam.txt
@@ -0,0 +1,85 @@
+Broadcom BCM283x Camera Interface (Unicam)
+------------------------------------------
+
+The Unicam block on BCM283x SoCs is the receiver for either
+CSI-2 or CCP2 data from image sensors or similar devices.
+
+The main platform using this SoC is the Raspberry Pi family of boards.
+On the Pi the VideoCore firmware can also control this hardware block,
+and driving it from two different processors will cause issues.
+To avoid this, the firmware checks the device tree configuration
+during boot. If it finds device tree nodes called csi0 or csi1 then
+it will stop the firmware accessing the block, and it can then
+safely be used via the device tree binding.
+
+Required properties:
+===================
+- compatible : must be "brcm,bcm2835-unicam".
+- reg : physical base address and length of the register sets for the
+ device.
+- interrupts : should contain the IRQ line for this Unicam instance.
+- clocks : list of clock specifiers, corresponding to entries in
+ clock-names property.
+- clock-names : must contain an "lp" entry, matching entries in the
+ clocks property.
+
+Unicam supports a single port node. It should contain one 'port' child node
+with child 'endpoint' node. Please refer to the bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Within the endpoint node the "remote-endpoint" and "data-lanes" properties
+are mandatory.
+Data lane reordering is not supported so the data lanes must be in order,
+starting at 1. The number of data lanes should represent the number of
+usable lanes for the hardware block. That may be limited by either the SoC or
+how the platform presents the interface, and the lower value must be used.
+
+Lane reordering is not supported on the clock lane either, so the optional
+property "clock-lane" will implicitly be <0>.
+Similarly lane inversion is not supported, therefore "lane-polarities" will
+implicitly be <0 0 0 0 0>.
+Neither of these values will be checked.
+
+Example:
+ csi1: csi1@7e801000 {
+ compatible = "brcm,bcm2835-unicam";
+ reg = <0x7e801000 0x800>,
+ <0x7e802004 0x4>;
+ interrupts = <2 7>;
+ clocks = <&clocks BCM2835_CLOCK_CAM1>;
+ clock-names = "lp";
+
+ port {
+ csi1_ep: endpoint {
+ remote-endpoint = <&tc358743_0>;
+ data-lanes = <1 2>;
+ };
+ };
+ };
+
+ i2c0: i2c@7e205000 {
+ tc358743: csi-hdmi-bridge@0f {
+ compatible = "toshiba,tc358743";
+ reg = <0x0f>;
+
+ clocks = <&tc358743_clk>;
+ clock-names = "refclk";
+
+ tc358743_clk: bridge-clk {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <27000000>;
+ };
+
+ port {
+ tc358743_0: endpoint {
+ remote-endpoint = <&csi1_ep>;
+ clock-lanes = <0>;
+ data-lanes = <1 2>;
+ clock-noncontinuous;
+ link-frequencies =
+ /bits/ 64 <297000000>;
+ };
+ };
+ };
+ };
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