[nrfconnect] Optimized external flash power consumption.

[markaj-nordic]

Problem

• QSPI consumes ~1.8 mA in active mode
• this is default mode for nRF53, even if the external flash is not used (no DFU ongoing)
• such high power consumption is a no-go for SED

Change overview

Force the QSPI into sleep mode and wake it up only on demand, i.e. right before the DFU

Testing

• tested on nrf53 and lock-app example, i.e. measured the power consumption before/during/after DFU in SED configuration

[github-actions]

PR #16219: Size comparison from b18b03a to 2da0cf4

Increases (8 builds for nrfconnect)

platform	target	config	section	b18b03a	2da0cf4	change	% change
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	bss	146644	146648	4	0.0
	lighting-app	nrf52840dk_nrf52840	(read/write)	1140875	1140939	64	0.0
			bss	143056	143060	4	0.0
			text	795956	796008	52	0.0
		nrf52840dk_nrf52840+rpc	(read/write)	1088655	1088703	48	0.0
			bss	139140	139144	4	0.0
			text	759824	759876	52	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	1046878	1046926	48	0.0
			bss	140120	140124	4	0.0
			text	709644	709696	52	0.0
	lock-app	nrf52840dk_nrf52840	(read/write)	1041167	1041231	64	0.0
			bss	133004	133008	4	0.0
			text	713728	713784	56	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	947426	947474	48	0.0
			bss	130100	130104	4	0.0
			text	627572	627628	56	0.0
	pump-app	nrf52840dk_nrf52840	(read/write)	1059203	1059251	48	0.0
			bss	132916	132920	4	0.0
			text	729836	729892	56	0.0
	pump-controller-app	nrf52840dk_nrf52840	(read/write)	1042455	1042503	48	0.0
			bss	132664	132668	4	0.0
			text	716764	716820	56	0.0

Decreases (1 build for nrfconnect)

platform	target	config	section	b18b03a	2da0cf4	change	% change
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1154011	1153931	-80	-0.0
			text	786976	786896	-80	-0.0

Full report (35 builds for cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	b18b03a	2da0cf4	change	% change
cyw30739	light	cyw930739m2evb_01	(read/write)	602578	602578	0	0.0
			.app_xip_area	509756	509756	0	0.0
			.bss	75576	75576	0	0.0
			.data	596	596	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	560430	560430	0	0.0
			.app_xip_area	469136	469136	0	0.0
			.bss	74080	74080	0	0.0
			.data	560	560	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor-no-progress-logging	cyw930739m2evb_01	(read/write)	570498	570498	0	0.0
			.app_xip_area	469556	469556	0	0.0
			.bss	83384	83384	0	0.0
			.data	520	520	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	919652	919652	0	0.0
			(read/write)	128672	128672	0	0.0
			.bss	126664	126664	0	0.0
			.data	2008	2008	0	0.0
			.text	919644	919644	0	0.0
		BRD4161A+rpc	(read only)	948440	948440	0	0.0
			(read/write)	144632	144632	0	0.0
			.bss	142440	142440	0	0.0
			.data	2188	2188	0	0.0
			.text	948432	948432	0	0.0
	window-app	BRD4161A	(read only)	850392	850392	0	0.0
			(read/write)	126632	126632	0	0.0
			.bss	124768	124768	0	0.0
			.data	1864	1864	0	0.0
			.text	850384	850384	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	961388	961388	0	0.0
			(read/write)	1394938	1394938	0	0.0
			.dram0.bss	64056	64056	0	0.0
			.dram0.data	14188	14188	0	0.0
			.flash.rodata	197776	197776	0	0.0
			.flash.text	961388	961388	0	0.0
			.iram0.text	62016	62016	0	0.0
		m5stack	(read only)	1017011	1017011	0	0.0
			(read/write)	462148	462148	0	0.0
			.dram0.bss	69576	69576	0	0.0
			.dram0.data	34016	34016	0	0.0
			.flash.rodata	226720	226720	0	0.0
			.flash.text	1011627	1011627	0	0.0
			.iram0.text	123107	123107	0	0.0
k32w	light	k32w061+release	(read/write)	699340	699340	0	0.0
			.bss	77560	77560	0	0.0
			.data	1888	1888	0	0.0
			.text	614092	614092	0	0.0
	lock	k32w061+release	(read/write)	699644	699644	0	0.0
			.bss	77552	77552	0	0.0
			.data	1908	1908	0	0.0
			.text	614384	614384	0	0.0
linux	all-clusters-app	debug	(read only)	2465225	2465225	0	0.0
			(read/write)	146352	146352	0	0.0
			.bss	60640	60640	0	0.0
			.data	1264	1264	0	0.0
			.data.rel.ro	78728	78728	0	0.0
			.dynamic	592	592	0	0.0
			.got	4168	4168	0	0.0
			.init	27	27	0	0.0
			.init_array	936	936	0	0.0
			.rodata	210693	210693	0	0.0
			.text	2091298	2091298	0	0.0
	bridge-app	debug+rpc	(read only)	1749757	1749757	0	0.0
			(read/write)	92912	92912	0	0.0
			.bss	47752	47752	0	0.0
			.data	1952	1952	0	0.0
			.data.rel.ro	38128	38128	0	0.0
			.dynamic	592	592	0	0.0
			.got	3920	3920	0	0.0
			.init	27	27	0	0.0
			.init_array	544	544	0	0.0
			.rodata	143308	143308	0	0.0
			.text	1490901	1490901	0	0.0
	chip-tool	debug	(read only)	10095037	10095037	0	0.0
			(read/write)	357680	357680	0	0.0
			.bss	25696	25696	0	0.0
			.data	1072	1072	0	0.0
			.data.rel.ro	324864	324864	0	0.0
			.dynamic	608	608	0	0.0
			.got	4776	4776	0	0.0
			.init	27	27	0	0.0
			.init_array	616	616	0	0.0
			.rodata	514997	514997	0	0.0
			.text	8798789	8798789	0	0.0
	chip-tool-ipv6only	arm64	(read only)	9728092	9728092	0	0.0
			(read/write)	475425	475425	0	0.0
			.bss	44017	44017	0	0.0
			.data	1128	1128	0	0.0
			.data.rel.ro	371232	371232	0	0.0
			.dynamic	560	560	0	0.0
			.got	55256	55256	0	0.0
			.init	24	24	0	0.0
			.init_array	192	192	0	0.0
			.rodata	492196	492196	0	0.0
			.text	8186052	8186052	0	0.0
	door-lock-app	debug	(read only)	1984385	1984385	0	0.0
			(read/write)	119776	119776	0	0.0
			.bss	50944	50944	0	0.0
			.data	992	992	0	0.0
			.data.rel.ro	62456	62456	0	0.0
			.dynamic	592	592	0	0.0
			.got	4104	4104	0	0.0
			.init	27	27	0	0.0
			.init_array	664	664	0	0.0
			.rodata	178396	178396	0	0.0
			.text	1657090	1657090	0	0.0
	lighting-app	debug+rpc	(read only)	2115961	2115961	0	0.0
			(read/write)	125160	125160	0	0.0
			.bss	51776	51776	0	0.0
			.data	1472	1472	0	0.0
			.data.rel.ro	66408	66408	0	0.0
			.dynamic	608	608	0	0.0
			.got	4136	4136	0	0.0
			.init	27	27	0	0.0
			.init_array	736	736	0	0.0
			.rodata	170940	170940	0	0.0
			.text	1789106	1789106	0	0.0
	ota-provider-app	debug	(read only)	1918537	1918537	0	0.0
			(read/write)	115536	115536	0	0.0
			.bss	50816	50816	0	0.0
			.data	1288	1288	0	0.0
			.data.rel.ro	57816	57816	0	0.0
			.dynamic	608	608	0	0.0
			.got	4360	4360	0	0.0
			.init	27	27	0	0.0
			.init_array	616	616	0	0.0
			.rodata	164267	164267	0	0.0
			.text	1603266	1603266	0	0.0
	ota-requestor-app	debug	(read only)	1949249	1949249	0	0.0
			(read/write)	118568	118568	0	0.0
			.bss	51840	51840	0	0.0
			.data	1416	1416	0	0.0
			.data.rel.ro	59880	59880	0	0.0
			.dynamic	592	592	0	0.0
			.got	4152	4152	0	0.0
			.init	27	27	0	0.0
			.init_array	640	640	0	0.0
			.rodata	160452	160452	0	0.0
			.text	1637570	1637570	0	0.0
	shell	debug	(read only)	2411385	2411385	0	0.0
			(read/write)	150184	150184	0	0.0
			.bss	70600	70600	0	0.0
			.data	784	784	0	0.0
			.data.rel.ro	73088	73088	0	0.0
			.dynamic	592	592	0	0.0
			.got	4152	4152	0	0.0
			.init	27	27	0	0.0
			.init_array	920	920	0	0.0
			.rodata	207474	207474	0	0.0
			.text	2047762	2047762	0	0.0
	thermostat-no-ble	arm64	(read only)	2207236	2207236	0	0.0
			(read/write)	149377	149377	0	0.0
			.bss	65649	65649	0	0.0
			.data	1024	1024	0	0.0
			.data.rel.ro	75368	75368	0	0.0
			.dynamic	560	560	0	0.0
			.got	4352	4352	0	0.0
			.init	24	24	0	0.0
			.init_array	360	360	0	0.0
			.rodata	136756	136756	0	0.0
			.text	1851168	1851168	0	0.0
	tv-app	debug	(read only)	2656097	2656097	0	0.0
			(read/write)	250776	250776	0	0.0
			.bss	167840	167840	0	0.0
			.data	3104	3104	0	0.0
			.data.rel.ro	73800	73800	0	0.0
			.dynamic	592	592	0	0.0
			.got	4536	4536	0	0.0
			.init	27	27	0	0.0
			.init_array	880	880	0	0.0
			.rodata	204213	204213	0	0.0
			.text	2277826	2277826	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2352756	2352756	0	0.0
			.bss	186652	186652	0	0.0
			.data	5752	5752	0	0.0
			.text	1315356	1315356	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1154011	1153931	-80	-0.0
			bss	146644	146648	4	0.0
			rodata	145276	145276	0	0.0
			text	786976	786896	-80	-0.0
	lighting-app	nrf52840dk_nrf52840	(read/write)	1140875	1140939	64	0.0
			bss	143056	143060	4	0.0
			rodata	123028	123028	0	0.0
			text	795956	796008	52	0.0
		nrf52840dk_nrf52840+rpc	(read/write)	1088655	1088703	48	0.0
			bss	139140	139144	4	0.0
			rodata	110616	110616	0	0.0
			text	759824	759876	52	0.0
		nrf52840dongle_nrf52840	(read/write)	1153735	1153735	0	0.0
			bss	144072	144072	0	0.0
			rodata	121924	121924	0	0.0
			text	797988	797988	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	1046878	1046926	48	0.0
			bss	140120	140124	4	0.0
			rodata	115180	115180	0	0.0
			text	709644	709696	52	0.0
	lock-app	nrf52840dk_nrf52840	(read/write)	1041167	1041231	64	0.0
			bss	133004	133008	4	0.0
			rodata	115696	115696	0	0.0
			text	713728	713784	56	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	947426	947474	48	0.0
			bss	130100	130104	4	0.0
			rodata	107896	107896	0	0.0
			text	627572	627628	56	0.0
	pump-app	nrf52840dk_nrf52840	(read/write)	1059203	1059251	48	0.0
			bss	132916	132920	4	0.0
			rodata	117636	117636	0	0.0
			text	729836	729892	56	0.0
	pump-controller-app	nrf52840dk_nrf52840	(read/write)	1042455	1042503	48	0.0
			bss	132664	132668	4	0.0
			rodata	114216	114216	0	0.0
			text	716764	716820	56	0.0
p6	all-clusters-app	default	(read/write)	2492152	2492152	0	0.0
			.bss	120080	120080	0	0.0
			.data	2632	2632	0	0.0
			.text	1450416	1450416	0	0.0
	light-app	default	(read/write)	2396000	2396000	0	0.0
			.bss	113544	113544	0	0.0
			.data	2488	2488	0	0.0
			.text	1354264	1354264	0	0.0
	lock-app	default	(read/write)	2359544	2359544	0	0.0
			.bss	113288	113288	0	0.0
			.data	2448	2448	0	0.0
			.text	1317808	1317808	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	893770	893770	0	0.0
			bss	87432	87432	0	0.0
			noinit	37160	37160	0	0.0
			text	631868	631868	0	0.0

[kkasperczyk-no]

@andy31415 can we fast-track this PR?