59 lines
2.0 KiB
Plaintext
59 lines
2.0 KiB
Plaintext
NXP Display Mix sft-rstn Reset Controller
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=========================================
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This binding describes a reset controller device that is used to reset
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or de-reset all the submodules(such as, LCDIF, MIPI DSI, MIPI CSI, ISI
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and etc) included by the Display Mix subsystem on IMX8MM and IMX8MN
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platforms. Only assert and deassert functions are required for submodule
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reset or de-reset.
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Please also refer to reset.txt in this directory for common reset
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controller binding usage.
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Required properties:
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- compatible: Should be "fsl,imx8mm-dispmix-sft-rstn" or
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"fsl,imx8mn-dispmix-sft-rstn".
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- reg: should be register base and length as documented in the datasheet.
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- clocks: phandle and clock specifier to disp apb clock for register access.
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- clock-names: should be "disp-apb".
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- power-domains: phandle to dispmix power domain.
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- reset-cells: 1, see below.
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example:
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dispmix_sft_rstn: dispmix-sft-rstn@32e28000 {
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compatible = "fsl,imx8mm-dispmix-sft-rstn";
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reg = <0x0 0x32e28000 0x0 0x4>;
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clocks = <&clk IMX8MM_CLK_DISP_APB_ROOT>;
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clock-names = "disp-apb";
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active_low;
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power-domains = <&dispmix_pd>;
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#reset-cells = <1>;
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};
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Specifying sft-rstn control of devices
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======================================
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Device nodes in Display Mix should specify the reset channel required in
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their "resets" property, containing a phandle to the sft-rstn device node
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and an index to specify which channel to use, as described in
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Documentation/devicetree/bindings/reset/reset.txt.
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example:
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lcdif_resets: lcdif-resets {
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#address-cells = <1>;
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#size-cells = <0>;
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#reset-cells = <0>;
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lcdif-soft-resetn {
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compatible = "lcdif,soft-resetn";
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resets = <&dispmix_sft_rstn IMX8MN_LCDIF_APB_CLK_RESET>,
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<&dispmix_sft_rstn IMX8MN_LCDIF_PIXEL_CLK_RESET>;
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};
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};
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Macro definitions for the supported reset channels can be found in:
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include/dt-bindings/reset/imx8mm-dispmix.h and
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include/dt-bindings/reset/imx8mn-dispmix.h.
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