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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/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
- #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 = <0x48004a00 0x4>;
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 = <0x48004e00 0x4>;
ti,bit-shift = <0>;
};
emac_ick: emac_ick@4800259c {
#clock-cells = <0>;
compatible = "ti,am35xx-gate-clock";
clocks = <&ipss_ick>;
reg = <0x4800259c 0x4>;
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 = <0x48004d00 0x4>;
ti,set-bit-to-disable;
};
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