€•í'Œsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ)/translations/zh_CN/arch/arm/sunxi/clocks”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/zh_TW/arch/arm/sunxi/clocks”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/it_IT/arch/arm/sunxi/clocks”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/ja_JP/arch/arm/sunxi/clocks”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/ko_KR/arch/arm/sunxi/clocks”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ)/translations/sp_SP/arch/arm/sunxi/clocks”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒ7Frequently asked questions about the sunxi clock system”h]”hŒ7Frequently asked questions about the sunxi clock system”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒC/var/lib/git/docbuild/linux/Documentation/arch/arm/sunxi/clocks.rst”h KubhŒ paragraph”“”)”}”(hŒ˜This document contains useful bits of information that people tend to ask about the sunxi clock system, as well as accompanying ASCII art when adequate.”h]”hŒ˜This document contains useful bits of information that people tend to ask about the sunxi clock system, as well as accompanying ASCII art when adequate.”…””}”(hh¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒNQ: Why is the main 24MHz oscillator gateable? Wouldn't that break the system? ”h]”(hŒterm”“”)”}”(hŒEQ: Why is the main 24MHz oscillator gateable? Wouldn't that break the”h]”hŒGQ: Why is the main 24MHz oscillator gateable? Wouldn’t that break the”…””}”(hhÔhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÒhŸh¶h K hhÎubhŒ definition”“”)”}”(hhh]”h¸)”}”(hŒsystem?”h]”hŒsystem?”…””}”(hhçhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K hhäubah}”(h]”h ]”h"]”h$]”h&]”uh1hâhhÎubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÌhŸh¶h K hhÉubhÍ)”}”(hXA: The 24MHz oscillator allows gating to save power. Indeed, if gated carelessly the system would stop functioning, but with the right steps, one can gate it and keep the system running. Consider this simplified suspend example: While the system is operational, you would see something like:: 24MHz 32kHz | PLL1 \ \_ CPU Mux | [CPU] When you are about to suspend, you switch the CPU Mux to the 32kHz oscillator:: 24Mhz 32kHz | | PLL1 | / CPU Mux _/ | [CPU] Finally you can gate the main oscillator:: 32kHz | | / CPU Mux _/ | [CPU] ”h]”(hÓ)”}”(hŒEA: The 24MHz oscillator allows gating to save power. Indeed, if gated”h]”hŒEA: The 24MHz oscillator allows gating to save power. Indeed, if gated”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÒhŸh¶h K-hjubhã)”}”(hhh]”(h¸)”}”(hŒžcarelessly the system would stop functioning, but with the right steps, one can gate it and keep the system running. Consider this simplified suspend example:”h]”hŒžcarelessly the system would stop functioning, but with the right steps, one can gate it and keep the system running. Consider this simplified suspend example:”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K hjubh¸)”}”(hŒ?While the system is operational, you would see something like::”h]”hŒ>While the system is operational, you would see something like:”…””}”(hj$hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhjubhŒ literal_block”“”)”}”(hŒ?24MHz 32kHz | PLL1 \ \_ CPU Mux | [CPU]”h]”hŒ?24MHz 32kHz | PLL1 \ \_ CPU Mux | [CPU]”…””}”hj4sbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1j2hŸh¶h Khjubh¸)”}”(hŒOWhen you are about to suspend, you switch the CPU Mux to the 32kHz oscillator::”h]”hŒNWhen you are about to suspend, you switch the CPU Mux to the 32kHz oscillator:”…””}”(hjDhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khjubj3)”}”(hX" 24Mhz 32kHz | | PLL1 | / CPU Mux _/ | [CPU] Finally you can gate the main oscillator:: 32kHz | | / CPU Mux _/ | [CPU]”h]”hX" 24Mhz 32kHz | | PLL1 | / CPU Mux _/ | [CPU] Finally you can gate the main oscillator:: 32kHz | | / CPU Mux _/ | [CPU]”…””}”hjRsbah}”(h]”h ]”h"]”h$]”h&]”jBjCuh1j2hŸh¶h Khjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hâhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÌhŸh¶h K-hhÉhžhubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÇhh£hžhhŸh¶h Nubh¸)”}”(hŒ0Q: Were can I learn more about the sunxi clocks?”h]”hŒ0Q: Were can I learn more about the sunxi clocks?”…””}”(hjrhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K/hh£hžhubhÈ)”}”(hhh]”hÍ)”}”(hXSA: The linux-sunxi wiki contains a page documenting the clock registers, you can find it at http://linux-sunxi.org/A10/CCM The authoritative source for information at this time is the ccmu driver released by Allwinner, you can find it at https://github.com/linux-sunxi/linux-sunxi/tree/sunxi-3.0/arch/arm/mach-sun4i/clock/ccmu”h]”(hÓ)”}”(hŒHA: The linux-sunxi wiki contains a page documenting the clock registers,”h]”hŒHA: The linux-sunxi wiki contains a page documenting the clock registers,”…””}”(hj‡hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÒhŸh¶h K8hjƒubhã)”}”(hhh]”(h¸)”}”(hŒyou can find it at”h]”hŒyou can find it at”…””}”(hj˜hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K2hj•ubhŒ block_quote”“”)”}”(hŒhttp://linux-sunxi.org/A10/CCM ”h]”h¸)”}”(hŒhttp://linux-sunxi.org/A10/CCM”h]”hŒ reference”“”)”}”(hj®h]”hŒhttp://linux-sunxi.org/A10/CCM”…””}”(hj²hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”j®uh1j°hj¬ubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K4hj¨ubah}”(h]”h ]”h"]”h$]”h&]”uh1j¦hŸh¶h K4hj•ubh¸)”}”(hŒrThe authoritative source for information at this time is the ccmu driver released by Allwinner, you can find it at”h]”hŒrThe authoritative source for information at this time is the ccmu driver released by Allwinner, you can find it at”…””}”(hjÌhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K6hj•ubj§)”}”(hŒXhttps://github.com/linux-sunxi/linux-sunxi/tree/sunxi-3.0/arch/arm/mach-sun4i/clock/ccmu”h]”h¸)”}”(hjÜh]”j±)”}”(hjÜh]”hŒXhttps://github.com/linux-sunxi/linux-sunxi/tree/sunxi-3.0/arch/arm/mach-sun4i/clock/ccmu”…””}”(hjáhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”jÜuh1j°hjÞubah}”(h]”h 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