210 lines
6.9 KiB
Plaintext
210 lines
6.9 KiB
Plaintext
Samsung S5P/EXYNOS SoC Camera Subsystem (FIMC)
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----------------------------------------------
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The S5P/Exynos SoC Camera subsystem comprises of multiple sub-devices
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represented by separate device tree nodes. Currently this includes: FIMC (in
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the S5P SoCs series known as CAMIF), MIPI CSIS, FIMC-LITE and FIMC-IS (ISP).
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The sub-subdevices are defined as child nodes of the common 'camera' node which
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also includes common properties of the whole subsystem not really specific to
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any single sub-device, like common camera port pins or the CAMCLK clock outputs
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for external image sensors attached to an SoC.
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Common 'camera' node
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--------------------
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Required properties:
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- compatible: must be "samsung,fimc", "simple-bus"
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- clocks: list of clock specifiers, corresponding to entries in
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the clock-names property;
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- clock-names : must contain "sclk_cam0", "sclk_cam1", "pxl_async0",
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"pxl_async1" entries, matching entries in the clocks property.
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- #clock-cells: from the common clock bindings (../clock/clock-bindings.txt),
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must be 1. A clock provider is associated with the 'camera' node and it should
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be referenced by external sensors that use clocks provided by the SoC on
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CAM_*_CLKOUT pins. The clock specifier cell stores an index of a clock.
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The indices are 0, 1 for CAM_A_CLKOUT, CAM_B_CLKOUT clocks respectively.
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- clock-output-names: from the common clock bindings, should contain names of
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clocks registered by the camera subsystem corresponding to CAM_A_CLKOUT,
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CAM_B_CLKOUT output clocks respectively.
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The pinctrl bindings defined in ../pinctrl/pinctrl-bindings.txt must be used
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to define a required pinctrl state named "default" and optional pinctrl states:
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"idle", "active-a", active-b". These optional states can be used to switch the
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camera port pinmux at runtime. The "idle" state should configure both the camera
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ports A and B into high impedance state, especially the CAMCLK clock output
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should be inactive. For the "active-a" state the camera port A must be activated
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and the port B deactivated and for the state "active-b" it should be the other
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way around.
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The 'camera' node must include at least one 'fimc' child node.
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'fimc' device nodes
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-------------------
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Required properties:
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- compatible: "samsung,s5pv210-fimc" for S5PV210, "samsung,exynos4210-fimc"
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for Exynos4210 and "samsung,exynos4212-fimc" for Exynos4x12 SoCs;
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- reg: physical base address and length of the registers set for the device;
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- interrupts: should contain FIMC interrupt;
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- clocks: list of clock specifiers, must contain an entry for each required
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entry in clock-names;
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- clock-names: must contain "fimc", "sclk_fimc" entries.
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- samsung,pix-limits: an array of maximum supported image sizes in pixels, for
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details refer to Table 2-1 in the S5PV210 SoC User Manual; The meaning of
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each cell is as follows:
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0 - scaler input horizontal size,
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1 - input horizontal size for the scaler bypassed,
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2 - REAL_WIDTH without input rotation,
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3 - REAL_HEIGHT with input rotation,
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- samsung,sysreg: a phandle to the SYSREG node.
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Each FIMC device should have an alias in the aliases node, in the form of
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fimc<n>, where <n> is an integer specifying the IP block instance.
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Optional properties:
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- clock-frequency: maximum FIMC local clock (LCLK) frequency;
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- samsung,min-pix-sizes: an array specyfing minimum image size in pixels at
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the FIMC input and output DMA, in the first and second cell respectively.
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Default value when this property is not present is <16 16>;
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- samsung,min-pix-alignment: minimum supported image height alignment (first
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cell) and the horizontal image offset (second cell). The values are in pixels
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and default to <2 1> when this property is not present;
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- samsung,mainscaler-ext: a boolean property indicating whether the FIMC IP
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supports extended image size and has CIEXTEN register;
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- samsung,rotators: a bitmask specifying whether this IP has the input and
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the output rotator. Bits 4 and 0 correspond to input and output rotator
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respectively. If a rotator is present its corresponding bit should be set.
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Default value when this property is not specified is 0x11.
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- samsung,cam-if: a bolean property indicating whether the IP block includes
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the camera input interface.
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- samsung,isp-wb: this property must be present if the IP block has the ISP
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writeback input.
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- samsung,lcd-wb: this property must be present if the IP block has the LCD
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writeback input.
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'parallel-ports' node
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---------------------
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This node should contain child 'port' nodes specifying active parallel video
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input ports. It includes camera A and camera B inputs. 'reg' property in the
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port nodes specifies data input - 0, 1 indicates input A, B respectively.
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Optional properties
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- samsung,camclk-out (deprecated) : specifies clock output for remote sensor,
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0 - CAM_A_CLKOUT, 1 - CAM_B_CLKOUT;
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Image sensor nodes
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------------------
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The sensor device nodes should be added to their control bus controller (e.g.
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I2C0) nodes and linked to a port node in the csis or the parallel-ports node,
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using the common video interfaces bindings, defined in video-interfaces.txt.
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Example:
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aliases {
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fimc0 = &fimc_0;
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};
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/* Parallel bus IF sensor */
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i2c_0: i2c@13860000 {
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s5k6aa: sensor@3c {
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compatible = "samsung,s5k6aafx";
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reg = <0x3c>;
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vddio-supply = <...>;
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clock-frequency = <24000000>;
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clocks = <&camera 1>;
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clock-names = "mclk";
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port {
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s5k6aa_ep: endpoint {
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remote-endpoint = <&fimc0_ep>;
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bus-width = <8>;
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hsync-active = <0>;
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vsync-active = <1>;
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pclk-sample = <1>;
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};
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};
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};
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/* MIPI CSI-2 bus IF sensor */
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s5c73m3: sensor@1a {
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compatible = "samsung,s5c73m3";
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reg = <0x1a>;
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vddio-supply = <...>;
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clock-frequency = <24000000>;
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clocks = <&camera 0>;
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clock-names = "mclk";
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port {
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s5c73m3_1: endpoint {
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data-lanes = <1 2 3 4>;
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remote-endpoint = <&csis0_ep>;
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};
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};
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};
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};
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camera {
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compatible = "samsung,fimc", "simple-bus";
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clocks = <&clock 132>, <&clock 133>, <&clock 351>,
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<&clock 352>;
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clock-names = "sclk_cam0", "sclk_cam1", "pxl_async0",
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"pxl_async1";
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#clock-cells = <1>;
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clock-output-names = "cam_a_clkout", "cam_b_clkout";
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pinctrl-names = "default";
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pinctrl-0 = <&cam_port_a_clk_active>;
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#address-cells = <1>;
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#size-cells = <1>;
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/* parallel camera ports */
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parallel-ports {
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/* camera A input */
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port@0 {
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reg = <0>;
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fimc0_ep: endpoint {
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remote-endpoint = <&s5k6aa_ep>;
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bus-width = <8>;
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hsync-active = <0>;
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vsync-active = <1>;
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pclk-sample = <1>;
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};
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};
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};
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fimc_0: fimc@11800000 {
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compatible = "samsung,exynos4210-fimc";
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reg = <0x11800000 0x1000>;
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interrupts = <0 85 0>;
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};
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csis_0: csis@11880000 {
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compatible = "samsung,exynos4210-csis";
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reg = <0x11880000 0x1000>;
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interrupts = <0 78 0>;
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/* camera C input */
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port@3 {
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reg = <3>;
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csis0_ep: endpoint {
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remote-endpoint = <&s5c73m3_ep>;
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data-lanes = <1 2 3 4>;
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samsung,csis-hs-settle = <12>;
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};
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};
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};
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};
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The MIPI-CSIS device binding is defined in samsung-mipi-csis.txt.
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