<![CDATA[铚楃獫绉戞妧]]> http://www.71402172.com/ zh-cn www.emlog.net linux鍐呮牳涓殑GPIO绯荤粺涔嬶紙5锛?#38171;歡pio subsysem鍜宲inctrl subsystem涔嬮棿?#27537;鑰﹀悎 http://www.71402172.com/gpio_subsystem/pinctrl-and-gpio.html 鎸夌悊璇达紝kernel涓璯pio subsystem鍜宲inctrl subsystem?#27537;?#21479;绯诲簲璇ラ潪甯告?#21614;锛?

pinctrl subsystem绠$悊绯荤粺?#27537;?#22669;鏈夌鑴氾紝GPIO鏄繖浜?#32480;?#38004;氱殑鐢?#38315;?#28052;?#28051;?#32029;?#27932;姝pio subsystem?#31794;璇?#37828;痯inctrl subsystem?#27537;client?#32025;涔?#37721;?#37721;?#37707;歜ackend銆乧onsumer锛夛紝鍩?#27996;巔inctrl subsystem鎻愪?#28058;殑?#23003;鑳斤紝澶勭悊GPIO鏈夊叧?#27537;閫昏緫銆?nbsp;

涓嶈繃?#32029;?#30084;闄呮儏鍐靛嵈涓?#37828;繖涔?#32480;鍗曪紝瀹冧滑涔嬮棿鏈夌潃杈?#28051;?#32497;у瘑?#27537;鑰﹀悎?#32025;?#28229;涓?#28229;kernel涓璸inctrl鍜実pio鐩稿叧?#27537;?#30084;鐜板氨鐭ラ亾浜?#38171;?#37510;?#37832;?#37826;囧皢瀵硅繖绉嶈﹀悎杩涜涓涓?#32480;鍗曠殑鍒嗘瀽?#32029;瑙?#38322;?#28051;轰粈涔堣?#32342;?#29297;璁?#29825;?#37510;?

闃?#29831;诲叏鏂?gt;>]]>
Thu, 10 Aug 2017 14:17:49 +0000 wowo http://www.71402172.com/gpio_subsystem/pinctrl-and-gpio.html
linux鍐呮牳涓殑GPIO绯荤粺涔嬶紙4锛?#38171;歱inctrl椹卞姩?#27537;?#24714;瑙?#37724;?#37804;荤粨 http://www.71402172.com/gpio_subsystem/pinctrl-driver-summary.html [1][2][3]浠嬬粛浜唒in controller?#32025;瀵瑰簲?#27537;pin controller subsystem锛?#37510;乬pio controller?#32025;瀵瑰簲?#27537;GPIO subsystem锛?#37832;夊叧?#27537;鍩?#37832;?#22994;傚康?#32029;鍖呮?#29758;in multiplexing銆乸in configuration绛夌瓑銆?#37832;?#37826;囧皢鍩?#27996;庤繖浜?#37826;?#32468;狅紝鍗曠函?#28276;浠巔in controller driver?#27537;瑙?#25652;︼紙灞忚斀鎺塸inctrl core?#27537;?#30084;鐜扮粏鑺?#38171;夛紝?#24714;瑙inctrl subsystem?#27537;璁?#29825;?#37804;濇兂?#32029;?#33503;鎺?#37819;inctrl椹卞姩?#27537;绉?#22942;?#37724;屽疄鐜?#37826;规硶銆?闃?#29831;诲叏鏂?gt;>]]> Tue, 27 Jun 2017 14:30:11 +0000 wowo http://www.71402172.com/gpio_subsystem/pinctrl-driver-summary.html linux鍐呮牳涓殑GPIO绯荤粺涔嬶紙2锛?#38171;歱in control subsystem http://www.71402172.com/gpio_subsystem/pin-control-subsystem.html 鍦╨inux2.6鍐呮牳涓婂伐浣滅殑宓屽叆寮忚蒋浠跺伐绋?#29999;堝湪pin control涓婇兘?#32048;閬囧?#25292;繖?#29297;?#27537;鐘?#37712;?#38171;?

?#32025;1锛夊惎?#23017;涓涓?#37826;扮殑椤?#37929;悗?#32029;?#28214;瑕?#37837;? 鎹?#32429;?#28000;跺钩鍙扮殑璁?#28729;?#26473;涜?#23474;in control鐩稿叧?#27537;?#32042;鐮?#37510;備?#23338;锛?#37734;╞ootloader涓缓绔?#28051;涓?#28598;х殑table?#32029;鎻?#26473;板悇涓?#23534;?#38004;氱殑閰嶇疆鍜岀己鐪?#37912;?#37804;?#37510;?#23005;?#28598;栵紝鐢?#27996;嶴OC?#27537;寮?#38004;?#37828;?#37721;?#28000;?#28598;?#37922;? ?#27537;?#32029;?#27932;姝?#37734;ㄥ悇涓?#37711;?#28003;撶殑driver涓紝涔?#37721;?#38003;戒細瀵?#23534;?#38004;?#26473;涜?#23680;殑閰嶇疆銆傝繖浜涘伐浣滈兘鏄?#23011;旇?#20906;?#20346;?#24878;殑?#20240;浣滐紝?#28214;瑕佹瀬澶х殑鑰愬績鍜岀粏鑷?#25652;?#37510;?

?#32025;2锛?#37721;?#37916;版煇涓猟river涓?#38003;?#23005;?#29999;稿伐浣滐紝?#32245;?#32245;?#23268;?#23268;debug?#24727;鍙?#37916;?#28000;?#28000;呮槸?#27932;涓?#37711;?#28000;栫殑driver鍦?#37714;?#28654;嬪寲?#27537;?#32323;绋?#28051;?#28103;敼浜?#23534;?#38004;氱殑閰嶇疆?#32029;瀵?#38007;?#38007;?#23480;辩殑driver鏃犳硶姝?#29999;稿伐浣?

?#32025;3锛夊嵆渚?#37828;?#28051;籆PU鏄?#28051;?#29297;?#27537;椤?#37929;紝浣?#37828;?#37922;?#27996;?#28598;?#29825;剧殑涓嶅悓?#32029;?#22428;?#28369;涔?#28051;?#38003;?#28003;?#37922;?#28051;涓猭ernel image?#32029;鑰?#37828;?#36423;?#26916;昏淇敼浠?#37934;侊紙?#32342;浜?#28000;?#37934;?#28051;昏鏄痓oard-specific startup code锛?

?#32025;4锛?#28000;?#37934;?#28051;?#37828;潪甯哥殑鏁存?#20362;紝cut-and-pasted浠?#37934;佹弧澶?#26891;烇紝linux涓殑鍐?#28003;欎唬鐮?#28598;?#28598;?

浣? 涓?#28051;涓?#23443;屽叆寮忚蒋浠跺伐绋?#29999;堬紝椤?#37929;?#37707;?#28598;?#27996;嗭紝鎺?#29785;︾殑CPU?#27688;澶?#27996;嗭紝鎽旂殑璺ゅ氨澶?#27996;嗭紝涔嬪悗鑷?#37906;朵細鍘?#37804;?#38000;冿紝?#22428;?#28369;鏄?#37722;?#37721;?#28000;?#29785;?#37712;?#28051;婇潰?#27537;?#26870;棰樺憿锛?#23005;?#28598;栵紝瀵?#27996;?#37737;?#27996;嶢RM core閭?#27996;汼OC?#32029;?#27367;鐒?#29723;ㄩ潰涓婄湅?#25443;鏉ュ悇涓猄OC?#24711;涓?#37929;稿悓?#32029;浣?#37828;?#37734;╬in control涓?#26473;?#37832;夊緢澶氱?#31295;?#23680;殑鍐?#28729;圭殑?#32029;鏄?#37722;?#37721;?#28000;?#37814;?#28729;?#37814;?#37721;?#37713;?#37833;ワ紝杩涜杩?#28051;姝ョ殑鎶借薄?#25023;锛?#37826;扮増鏈?#28051;殑鍐呮牳?#32025;鏈?#37826;?#28000;?.14?#22679;鏈?#37712;呮牳涓轰?#23350;級鎻愬嚭浜唒in control subsystem鏉?#29785;?#37712;宠繖浜涢棶棰?#37510;?

闃?#29831;诲叏鏂?gt;>]]>
Sat, 26 Jul 2014 10:24:15 +0000 linuxer http://www.71402172.com/gpio_subsystem/pin-control-subsystem.html
Linux鍐呮牳涓殑GPIO绯荤粺涔嬶紙3锛?#38171;歱in controller driver浠?#37934;?#37714;嗘瀽 http://www.71402172.com/gpio_subsystem/pin-controller-driver.html 瀵?#27996;?#28051;涓?#23443;屽叆寮忚蒋浠跺伐绋?#29999;堬紝?#22428;?#28369;?#27537;?#33931;浠舵ā鍧楃粡甯?#37724;岀‖浠舵墦浜ら亾?#32029;pin control subsystem涔?#28051;嶄緥澶栵紝瀹?#26937;卞姩?#27537;纭?#28000;?#37721;?#37707;歱in controller?#32025;涓鑸珹RM soc?#27537;datasheet?#32048;鎶妏in controller?#27537;鍐?#28729;规斁鍏PIO controller?#27537;绔?#38010;?#28051;?#38171;夛紝涓昏?#20344;姛鑳藉?#21614;嫭锛?

?#32025;1锛塸in multiplexing銆?#37737;?#27996;嶢RM core?#27537;宓屽叆寮?#28598;勭悊鍣?#28051;鑸細鎻愪緵涓板?#23680;殑?#23003;鑳斤紝渚嬪camera interface銆丩CD interface銆乁SB銆両2C銆丼PI绛夌瓑銆傝櫧鐒?#28598;勭悊鍣?#37832;夊嚑鐧?#28051;猵in?#32029;浣?#37828;繖浜沺in杩?#37828;?#28051;?#28598;?#37714;?#38320;嶏紝?#27932;姝?#37832;?#27996;沺in?#28214;瑕?#28598;?#37922;?#37510;備?#23338;锛?27鍙? GPIO鍙?#28000;?#37707;?#28051;涓櫘閫氱殑GPIO鎺?#37714;禠ED?#32029;涔?#37721;?#28000;?#38320;嶇疆鎴怚2C?#27537;clock淇?#37721;鳳紝涔?#37721;?#28000;?#38320;嶇疆鎴怱PI?#27537;data out淇?#37721;?#37510;傚?#25782;?#35769;紝?#32342;浜涘姛鑳?#28051;?#37721;?#38003;?#37722;屾?#36346;瓨鍦紝?#27932;涓?#32429;?#28000;朵俊鍙?#37721;?#37832;?#28051;涓?#37510;?

?#32025;2锛塸in configuration銆傝繖浜?#38320;嶇疆鍙傛?#26495;?#21614;嫭锛歱ull-up/down鐢?#38339;荤殑璁?#28729;氾紝 tri-state璁?#28729;氾紝drive-strength?#27537;璁?#28729;?#37510;?

鏈? 鏂?#28051;昏鎻?#26473;皃in control subsystem涓殑low level driver?#32029;涔熷氨鏄?#26937;卞姩pin controller?#27537;driver銆?#37711;?#28003;撶殑纭?#28000;?#38315;夌敤?#27537;鏄疭3C2416?#27537;纭?#28000;跺钩鍙?#37510;傛棦鐒?#37828;?#28000;?#37934;?#37714;嗘瀽?#32029;鏈?#37826;?#28051;?#37828;潪甯?#28598;氱殑鎻?#26473;版?#21976;灦鎬х殑鍐?#28729;癸紝?#21479;浜?#37825;?#28051;猵in control subsystem?#33931;浠剁粨鏋勭殑鎻?#26473;?#29831;?#37721;傝僒ODO銆?

闃?#29831;?#37832;?#37826;囬渶瑕乨evice tree?#27537;鐭?#29831;嗭紝?#32531;璁?#26851;?#37711;?#38339;?#29831;?a href="http://www.71402172.com/linux_kenrel/dt-code-analysis.html">device tree浠?#37934;?#37714;嗘瀽銆?

闃?#29831;诲叏鏂?gt;>]]>
Tue, 22 Jul 2014 12:37:33 +0000 linuxer http://www.71402172.com/gpio_subsystem/pin-controller-driver.html
linux鍐呮牳涓殑GPIO绯荤粺涔嬶紙1锛?#38171;氳蒋浠舵?#21976;灦 http://www.71402172.com/gpio_subsystem/io-port-control.html 浣?#28051;?#28051;涓伐浣?#28598;氬?#23544;殑绯荤粺?#20240;绋?#29999;堬紝鍏?#28051;?#27996;?#37707;?#28051;?#28000;?#27996;嬫儏锛?#37737;硅鏂板?#27194;伐鍜岀粰鏂板?#27194;伐鍒?#38320;?#28000;诲姟銆?#28725;?#27996;?#38317;?#27996;?#37714;?#37714;?#28000;庡鏍?#37713;?#37833;ョ殑瀛?#37922;燂紝涓鑸?#37734;?#23534;濮嬬殑鏃跺欐?#37828;?#37714;?#38320;?#28051;浜涢潪 甯?#32480;鍗曠殑浠诲姟?#32029;渚嬪?#20404;PIO driver銆丩ED driver銆傚線?#32218;CPU datasheet?#27537;?#21479;浜嶨PIO鎴?#38000;匢O ports?#27537;绔?#38010;傞兘鏄?#23011;旇緝绠鍗曠殑?#32029;?#28522;甯?#38315;傚悎鍒?#37711;?#29723;岀殑?#20240;绋?#29999;?#37510;傝櫧鐒禛PIO瀛?#32495;荤粺鐩稿叧?#27537;纭?#28000;舵?#26055;緝绠鍗曪紝娌?#37832;?#28598;?#37833;傜殑鍗?#29825;紝涓嶈繃?#32029;瀵?#27996;庤蒋浠?#37814;借薄鑰岃█?#32029;鍏?#37714;?#28766;傛?#27537; ?#33931;浠?#37804;濇兂鏄?#23011;?#28051;?#23443;屽叆寮忚蒋浠跺伐绋?#29999;堥渶瑕?#37818;?#37819;$殑鍐?#28729;?#37510;?

鎴戞?#26449;惧悜浣?#37922;℅PIO绯荤粺?#32342;涓?#37722;嶅瓧鏉?#28000;?#37831;縂PIO driver?#32342;涓?#37722;嶅瓧?#32029;GPIO driver浠?#28000;呭寘鍚?#27996;唒in signal鐘?#37804;?#37818;?#37714;?#37724;?#29831;诲彇?#27537;鍐?#28729;癸紝鑰孏PIO绯荤粺鍖呮嫭浜唒in multiplexing銆乸in configuration銆丟PIO control銆丟PIO interrupt control绛?#37712;?#28729;?#37510;?#37832;?#37826;?#28051;昏鏄?#28000;?.14鍐呮牳浣?#28051;轰?#23338;瓙?#32029;璁?#26473;發inux kernel涓璆PIO绯荤粺?#27537;?#33931;浠舵?#21976;灦銆?

闃?#29831;诲叏鏂?gt;>]]>
Mon, 21 Jul 2014 06:40:58 +0000 linuxer http://www.71402172.com/gpio_subsystem/io-port-control.html
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