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Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0176-dt-bindings-Document-BCM283x-CSI2-CCP2-receiver.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0176-dt-bindings-Document-BCM283x-CSI2-CCP2-receiver.patch | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0176-dt-bindings-Document-BCM283x-CSI2-CCP2-receiver.patch b/target/linux/bcm27xx/patches-4.19/950-0176-dt-bindings-Document-BCM283x-CSI2-CCP2-receiver.patch new file mode 100644 index 0000000000..77fdd348d9 --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0176-dt-bindings-Document-BCM283x-CSI2-CCP2-receiver.patch @@ -0,0 +1,103 @@ +From 8299df54f2016290eed7a2bece3885aad36d13e2 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>; ++ }; ++ }; ++ }; ++ }; |