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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /Documentation/devicetree/bindings/clock/ti/gate.txt
parentInitial commit. (diff)
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Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+Binding for Texas Instruments gate clock.
+
+Binding status: Unstable - ABI compatibility may be broken in the future
+
+This binding uses the common clock binding[1]. This clock is
+quite much similar to the basic gate-clock [2], however,
+it supports a number of additional features. If no register
+is provided for this clock, the code assumes that a clockdomain
+will be controlled instead and the corresponding hw-ops for
+that is used.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/clock/gpio-gate-clock.txt
+[3] Documentation/devicetree/bindings/clock/ti/clockdomain.txt
+
+Required properties:
+- compatible : shall be one of:
+ "ti,gate-clock" - basic gate clock
+ "ti,wait-gate-clock" - gate clock which waits until clock is active before
+ returning from clk_enable()
+ "ti,dss-gate-clock" - gate clock with DSS specific hardware handling
+ "ti,am35xx-gate-clock" - gate clock with AM35xx specific hardware handling
+ "ti,clkdm-gate-clock" - clockdomain gate clock, which derives its functional
+ clock directly from a clockdomain, see [3] how
+ to map clockdomains properly
+ "ti,hsdiv-gate-clock" - gate clock with OMAP36xx specific hardware handling,
+ required for a hardware errata
+ "ti,composite-gate-clock" - composite gate clock, to be part of composite
+ clock
+ "ti,composite-no-wait-gate-clock" - composite gate clock that does not wait
+ for clock to be active before returning
+ from clk_enable()
+- #clock-cells : from common clock binding; shall be set to 0
+- clocks : link to phandle of parent clock
+- reg : offset for register controlling adjustable gate, not needed for
+ ti,clkdm-gate-clock type
+
+Optional properties:
+- ti,bit-shift : bit shift for programming the clock gate, invalid for
+ ti,clkdm-gate-clock type
+- ti,set-bit-to-disable : inverts default gate programming. Setting the bit
+ gates the clock and clearing the bit ungates the clock.
+
+Examples:
+ mmchs2_fck: mmchs2_fck@48004a00 {
+ #clock-cells = <0>;
+ compatible = "ti,gate-clock";
+ clocks = <&core_96m_fck>;
+ reg = <0x0a00>;
+ ti,bit-shift = <25>;
+ };
+
+ uart4_fck_am35xx: uart4_fck_am35xx {
+ #clock-cells = <0>;
+ compatible = "ti,wait-gate-clock";
+ clocks = <&core_48m_fck>;
+ reg = <0x0a00>;
+ ti,bit-shift = <23>;
+ };
+
+ dss1_alwon_fck_3430es2: dss1_alwon_fck_3430es2@48004e00 {
+ #clock-cells = <0>;
+ compatible = "ti,dss-gate-clock";
+ clocks = <&dpll4_m4x2_ck>;
+ reg = <0x0e00>;
+ ti,bit-shift = <0>;
+ };
+
+ emac_ick: emac_ick@4800259c {
+ #clock-cells = <0>;
+ compatible = "ti,am35xx-gate-clock";
+ clocks = <&ipss_ick>;
+ reg = <0x059c>;
+ ti,bit-shift = <1>;
+ };
+
+ emu_src_ck: emu_src_ck {
+ #clock-cells = <0>;
+ compatible = "ti,clkdm-gate-clock";
+ clocks = <&emu_src_mux_ck>;
+ };
+
+ dpll4_m2x2_ck: dpll4_m2x2_ck@48004d00 {
+ #clock-cells = <0>;
+ compatible = "ti,hsdiv-gate-clock";
+ clocks = <&dpll4_m2x2_mul_ck>;
+ ti,bit-shift = <0x1b>;
+ reg = <0x0d00>;
+ ti,set-bit-to-disable;
+ };
+
+ vlynq_gate_fck: vlynq_gate_fck {
+ #clock-cells = <0>;
+ compatible = "ti,composite-gate-clock";
+ clocks = <&core_ck>;
+ ti,bit-shift = <3>;
+ reg = <0x0200>;
+ };
+
+ sys_clkout2_src_gate: sys_clkout2_src_gate {
+ #clock-cells = <0>;
+ compatible = "ti,composite-no-wait-gate-clock";
+ clocks = <&core_ck>;
+ ti,bit-shift = <15>;
+ reg = <0x0070>;
+ };