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Device tree clock binding document for EMMA Mobile EV2 SMU, And Common clock framework based implementation of it. Following nodes are defined to describe clock tree. - renesas,emev2-smu - renesas,emev2-smu-clkdiv - renesas,emev2-smu-gclk These bindings are designed manually based on 19UH0037EJ1000_SMU : System Management Unit User's Manual So far, reparent is not implemented, and is fixed to index #0. Clock tree description is not included, and should be provided by device-tree. Signed-off-by: Takashi Yoshii <takasi-y@ops.dti.ne.jp> Acked-by: Magnus Damm <damm@opensource.se> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
99 lines
2.6 KiB
Plaintext
99 lines
2.6 KiB
Plaintext
Device tree Clock bindings for Renesas EMMA Mobile EV2
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This binding uses the common clock binding.
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* SMU
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System Management Unit described in user's manual R19UH0037EJ1000_SMU.
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This is not a clock provider, but clocks under SMU depend on it.
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Required properties:
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- compatible: Should be "renesas,emev2-smu"
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- reg: Address and Size of SMU registers
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* SMU_CLKDIV
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Function block with an input mux and a divider, which corresponds to
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"Serial clock generator" in fig."Clock System Overview" of the manual,
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and "xxx frequency division setting register" (XXXCLKDIV) registers.
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This makes internal (neither input nor output) clock that is provided
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to input of xxxGCLK block.
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Required properties:
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- compatible: Should be "renesas,emev2-smu-clkdiv"
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- reg: Byte offset from SMU base and Bit position in the register
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- clocks: Parent clocks. Input clocks as described in clock-bindings.txt
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- #clock-cells: Should be <0>
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* SMU_GCLK
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Clock gating node shown as "Clock stop processing block" in the
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fig."Clock System Overview" of the manual.
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Registers are "xxx clock gate control register" (XXXGCLKCTRL).
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Required properties:
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- compatible: Should be "renesas,emev2-smu-gclk"
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- reg: Byte offset from SMU base and Bit position in the register
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- clocks: Input clock as described in clock-bindings.txt
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- #clock-cells: Should be <0>
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Example of provider:
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usia_u0_sclkdiv: usia_u0_sclkdiv {
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compatible = "renesas,emev2-smu-clkdiv";
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reg = <0x610 0>;
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clocks = <&pll3_fo>, <&pll4_fo>, <&pll1_fo>, <&osc1_fo>;
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#clock-cells = <0>;
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};
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usia_u0_sclk: usia_u0_sclk {
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compatible = "renesas,emev2-smu-gclk";
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reg = <0x4a0 1>;
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clocks = <&usia_u0_sclkdiv>;
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#clock-cells = <0>;
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};
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Example of consumer:
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uart@e1020000 {
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compatible = "renesas,em-uart";
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reg = <0xe1020000 0x38>;
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interrupts = <0 8 0>;
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clocks = <&usia_u0_sclk>;
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clock-names = "sclk";
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};
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Example of clock-tree description:
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This describes a clock path in the clock tree
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c32ki -> pll3_fo -> usia_u0_sclkdiv -> usia_u0_sclk
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smu@e0110000 {
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compatible = "renesas,emev2-smu";
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reg = <0xe0110000 0x10000>;
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#address-cells = <2>;
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#size-cells = <0>;
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c32ki: c32ki {
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compatible = "fixed-clock";
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clock-frequency = <32768>;
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#clock-cells = <0>;
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};
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pll3_fo: pll3_fo {
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compatible = "fixed-factor-clock";
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clocks = <&c32ki>;
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clock-div = <1>;
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clock-mult = <7000>;
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#clock-cells = <0>;
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};
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usia_u0_sclkdiv: usia_u0_sclkdiv {
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compatible = "renesas,emev2-smu-clkdiv";
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reg = <0x610 0>;
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clocks = <&pll3_fo>;
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#clock-cells = <0>;
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};
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usia_u0_sclk: usia_u0_sclk {
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compatible = "renesas,emev2-smu-gclk";
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reg = <0x4a0 1>;
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clocks = <&usia_u0_sclkdiv>;
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#clock-cells = <0>;
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};
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};
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