Works ----- # cat /sys/class/i2c-dev/i2c-2/name 7000d000.i2c ... i2c@7000d000 { clock-frequency = <100000>; status = "okay"; rt5640: rt5640@1c { compatible = "realtek,rt5640"; reg = <0x1c>; interrupt-parent = <&gpio>; interrupts = ; realtek,dmic1-data-pin = <1>; realtek,dmic2-data-pin = <0>; realtek,in1-differential; }; ... # cat /proc/asound/card0/pcm0p/sub0/hw_params access: MMAP_INTERLEAVED format: S16_LE subformat: STD channels: 2 rate: 48000 (48000/1) period_size: 1024 buffer_size: 8192 # trace-cmd record -e regmap:* # trace-cmd report CPU 0 is empty CPU 1 is empty cpus=4 mpv-308 [002] 171.268104: regmap_cache_only: 70080000.ahub flag=0 mpv-308 [002] 171.268116: regmap_cache_only: 70080000.ahub flag=0 mpv-308 [002] 171.268131: regmap_cache_only: 70080400.i2s flag=0 mpv-308 [002] 171.272549: regmap_reg_read_cache: 2-001c reg=64 val=0 mpv-308 [002] 171.272556: regmap_reg_read_cache: 2-001c reg=80 val=0 mpv-308 [002] 171.272564: regmap_reg_read_cache: 2-001c reg=70 val=8000 mpv-308 [002] 171.272567: regmap_reg_read_cache: 2-001c reg=70 val=8000 mpv-308 [002] 171.272569: regmap_reg_read_cache: 2-001c reg=73 val=1114 mpv-308 [002] 171.272572: regmap_reg_write: 2-001c reg=73 val=114 mpv-308 [002] 171.272581: regmap_hw_write_start: 2-001c reg=73 count=1 mpv-308 [002] 171.273332: regmap_hw_write_done: 2-001c reg=73 count=1 mpv-308 [002] 171.273379: regmap_reg_read_cache: 70080400.i2s reg=0 val=400 mpv-308 [002] 171.273382: regmap_reg_write: 70080400.i2s reg=0 val=403 mpv-308 [002] 171.273395: regmap_reg_write: 70080400.i2s reg=4 val=1f mpv-308 [002] 171.273398: regmap_reg_write: 70080400.i2s reg=14 val=1013304 mpv-308 [002] 171.273401: regmap_reg_write: 70080400.i2s reg=8 val=10001 kworker/u8:2-145 [003] 171.273992: regmap_reg_read_cache: 2-001c reg=63 val=0 kworker/u8:2-145 [003] 171.273999: regmap_reg_write: 2-001c reg=63 val=a810 kworker/u8:2-145 [003] 171.274006: regmap_hw_write_start: 2-001c reg=63 count=1 kworker/u8:2-145 [003] 171.274478: regmap_hw_write_done: 2-001c reg=63 count=1 kworker/u8:2-145 [003] 171.286067: regmap_reg_read_cache: 2-001c reg=63 val=a810 kworker/u8:2-145 [003] 171.286076: regmap_reg_write: 2-001c reg=63 val=e818 kworker/u8:2-145 [003] 171.286083: regmap_hw_write_start: 2-001c reg=63 count=1 kworker/u8:2-145 [003] 171.286568: regmap_hw_write_done: 2-001c reg=63 count=1 kworker/u8:2-145 [003] 171.286575: regmap_reg_read_cache: 2-001c reg=fa val=3f01 kworker/u8:2-145 [003] 171.286577: regmap_reg_read_cache: 2-001c reg=93 val=3030 mpv-308 [002] 171.286643: regmap_reg_read_cache: 2-001c reg=61 val=0 mpv-308 [002] 171.286647: regmap_reg_write: 2-001c reg=61 val=9800 mpv-308 [002] 171.286650: regmap_hw_write_start: 2-001c reg=61 count=1 mpv-308 [002] 171.287345: regmap_hw_write_done: 2-001c reg=61 count=1 mpv-308 [002] 171.287379: regmap_reg_read_cache: 2-001c reg=63 val=e818 mpv-308 [002] 171.287381: regmap_reg_write: 2-001c reg=63 val=e8d8 mpv-308 [002] 171.287384: regmap_hw_write_start: 2-001c reg=63 count=1 mpv-308 [002] 171.287845: regmap_hw_write_done: 2-001c reg=63 count=1 mpv-308 [002] 171.287875: regmap_hw_read_start: 2-001c reg=6a count=1 mpv-308 [002] 171.289021: regmap_hw_read_done: 2-001c reg=6a count=1 mpv-308 [002] 171.289025: regmap_reg_read: 2-001c reg=6a val=23 mpv-308 [002] 171.289027: regmap_reg_write: 2-001c reg=6a val=24 mpv-308 [002] 171.289029: regmap_hw_write_start: 2-001c reg=6a count=1 mpv-308 [002] 171.289561: regmap_hw_write_done: 2-001c reg=6a count=1 mpv-308 [002] 171.289565: regmap_hw_read_start: 2-001c reg=6c count=1 mpv-308 [002] 171.290174: regmap_hw_read_done: 2-001c reg=6c count=1 mpv-308 [002] 171.290177: regmap_reg_read: 2-001c reg=124 val=420 mpv-308 [002] 171.290180: regmap_reg_write: 2-001c reg=124 val=220 mpv-308 [002] 171.290185: regmap_hw_read_start: 2-001c reg=6a count=1 mpv-308 [002] 171.290800: regmap_hw_read_done: 2-001c reg=6a count=1 mpv-308 [002] 171.290804: regmap_reg_read: 2-001c reg=6a val=24 mpv-308 [002] 171.290807: regmap_hw_write_start: 2-001c reg=6c count=1 mpv-308 [002] 171.291300: regmap_hw_write_done: 2-001c reg=6c count=1 mpv-308 [002] 171.291333: regmap_reg_read_cache: 2-001c reg=8f val=1100 mpv-308 [002] 171.291335: regmap_reg_write: 2-001c reg=8f val=3100 mpv-308 [002] 171.291339: regmap_hw_write_start: 2-001c reg=8f count=1 mpv-308 [002] 171.291802: regmap_hw_write_done: 2-001c reg=8f count=1 mpv-308 [002] 171.291830: regmap_reg_read_cache: 2-001c reg=8e val=4 mpv-308 [002] 171.291833: regmap_reg_write: 2-001c reg=8e val=9 mpv-308 [002] 171.291838: regmap_hw_write_start: 2-001c reg=8e count=1 mpv-308 [002] 171.292433: regmap_hw_write_done: 2-001c reg=8e count=1 mpv-308 [002] 171.292461: regmap_reg_write: 2-001c reg=177 val=9f00 mpv-308 [002] 171.292466: regmap_hw_read_start: 2-001c reg=6a count=1 mpv-308 [002] 171.293274: regmap_hw_read_done: 2-001c reg=6a count=1 mpv-308 [002] 171.293278: regmap_reg_read: 2-001c reg=6a val=24 mpv-308 [002] 171.293281: regmap_reg_write: 2-001c reg=6a val=77 mpv-308 [002] 171.293284: regmap_hw_write_start: 2-001c reg=6a count=1 mpv-308 [002] 171.293894: regmap_hw_write_done: 2-001c reg=6a count=1 mpv-308 [002] 171.293897: regmap_hw_write_start: 2-001c reg=6c count=1 mpv-308 [002] 171.294484: regmap_hw_write_done: 2-001c reg=6c count=1 mpv-308 [002] 171.294510: regmap_reg_read_cache: 2-001c reg=63 val=e8d8 mpv-308 [002] 171.294513: regmap_reg_write: 2-001c reg=63 val=a8d0 mpv-308 [002] 171.294516: regmap_hw_write_start: 2-001c reg=63 count=1 mpv-308 [002] 171.294976: regmap_hw_write_done: 2-001c reg=63 count=1 mpv-308 [002] 171.295001: regmap_reg_read_cache: 2-001c reg=63 val=a8d0 mpv-308 [002] 171.295004: regmap_reg_write: 2-001c reg=63 val=a8f0 mpv-308 [002] 171.295006: regmap_hw_write_start: 2-001c reg=63 count=1 mpv-308 [002] 171.295680: regmap_hw_write_done: 2-001c reg=63 count=1 mpv-308 [002] 171.306100: regmap_reg_read_cache: 2-001c reg=63 val=a8f0 mpv-308 [002] 171.306108: regmap_reg_write: 2-001c reg=63 val=e8f8 mpv-308 [002] 171.306114: regmap_hw_write_start: 2-001c reg=63 count=1 mpv-308 [002] 171.306885: regmap_hw_write_done: 2-001c reg=63 count=1 mpv-308 [002] 171.306954: regmap_reg_read_cache: 2-001c reg=8f val=3100 mpv-308 [002] 171.306957: regmap_reg_write: 2-001c reg=8f val=1140 mpv-308 [002] 171.306961: regmap_hw_write_start: 2-001c reg=8f count=1 mpv-308 [002] 171.307532: regmap_hw_write_done: 2-001c reg=8f count=1 mpv-308 [002] 171.307559: regmap_reg_read_cache: 2-001c reg=91 val=c00 mpv-308 [002] 171.307561: regmap_reg_write: 2-001c reg=91 val=e00 mpv-308 [002] 171.307564: regmap_hw_write_start: 2-001c reg=91 count=1 mpv-308 [002] 171.308068: regmap_hw_write_done: 2-001c reg=91 count=1 mpv-308 [002] 171.308093: regmap_reg_read_cache: 2-001c reg=90 val=646 mpv-308 [002] 171.308096: regmap_reg_write: 2-001c reg=90 val=737 mpv-308 [002] 171.308099: regmap_hw_write_start: 2-001c reg=90 count=1 mpv-308 [002] 171.308573: regmap_hw_write_done: 2-001c reg=90 count=1 mpv-308 [002] 171.308600: regmap_reg_write: 2-001c reg=137 val=1c00 mpv-308 [002] 171.308607: regmap_hw_read_start: 2-001c reg=6a count=1 mpv-308 [002] 171.309204: regmap_hw_read_done: 2-001c reg=6a count=1 mpv-308 [002] 171.309212: regmap_reg_read: 2-001c reg=6a val=77 mpv-308 [002] 171.309215: regmap_reg_write: 2-001c reg=6a val=37 mpv-308 [002] 171.309217: regmap_hw_write_start: 2-001c reg=6a count=1 mpv-308 [002] 171.309994: regmap_hw_write_done: 2-001c reg=6a count=1 mpv-308 [002] 171.309999: regmap_hw_write_start: 2-001c reg=6c count=1 mpv-308 [002] 171.310714: regmap_hw_write_done: 2-001c reg=6c count=1 mpv-308 [002] 171.310747: regmap_reg_read_cache: 2-001c reg=8e val=9 mpv-308 [002] 171.310750: regmap_reg_write: 2-001c reg=8e val=5 mpv-308 [002] 171.310755: regmap_hw_write_start: 2-001c reg=8e count=1 mpv-308 [002] 171.311331: regmap_hw_write_done: 2-001c reg=8e count=1 mpv-308 [002] 171.311361: regmap_hw_read_start: 2-001c reg=6a count=1 mpv-308 [002] 171.312384: regmap_hw_read_done: 2-001c reg=6a count=1 mpv-308 [002] 171.312388: regmap_reg_read: 2-001c reg=6a val=37 mpv-308 [002] 171.312391: regmap_reg_write: 2-001c reg=6a val=24 mpv-308 [002] 171.312394: regmap_hw_write_start: 2-001c reg=6a count=1 mpv-308 [002] 171.312891: regmap_hw_write_done: 2-001c reg=6a count=1 mpv-308 [002] 171.312897: regmap_hw_read_start: 2-001c reg=6c count=1 mpv-308 [002] 171.313657: regmap_hw_read_done: 2-001c reg=6c count=1 mpv-308 [002] 171.313661: regmap_reg_read: 2-001c reg=124 val=220 mpv-308 [002] 171.313664: regmap_reg_write: 2-001c reg=124 val=420 mpv-308 [002] 171.313667: regmap_hw_read_start: 2-001c reg=6a count=1 mpv-308 [002] 171.314977: regmap_hw_read_done: 2-001c reg=6a count=1 mpv-308 [002] 171.314984: regmap_reg_read: 2-001c reg=6a val=24 mpv-308 [002] 171.314990: regmap_hw_write_start: 2-001c reg=6c count=1 mpv-308 [002] 171.315479: regmap_hw_write_done: 2-001c reg=6c count=1 mpv-308 [002] 171.315519: regmap_reg_read_cache: 2-001c reg=2 val=cbcb mpv-308 [002] 171.315522: regmap_reg_write: 2-001c reg=2 val=4b4b mpv-308 [002] 171.315525: regmap_hw_write_start: 2-001c reg=2 count=1 mpv-308 [002] 171.316002: regmap_hw_write_done: 2-001c reg=2 count=1 mpv/ao-318 [003] 171.744407: regmap_reg_read_cache: 70080000.ahub reg=0 val=70777 mpv/ao-318 [003] 171.744424: regmap_reg_write: 70080000.ahub reg=0 val=80070777 mpv/ao-318 [003] 171.744433: regmap_reg_read_cache: 70080400.i2s reg=0 val=403 mpv/ao-318 [003] 171.744435: regmap_reg_write: 70080400.i2s reg=0 val=80000403 mpv-308 [002] 173.755178: regmap_reg_read_cache: 70080000.ahub reg=0 val=80070777 mpv-308 [002] 173.755188: regmap_reg_write: 70080000.ahub reg=0 val=70777 mpv-308 [002] 173.755196: regmap_reg_read_cache: 70080400.i2s reg=0 val=80000403 mpv-308 [002] 173.755198: regmap_reg_write: 70080400.i2s reg=0 val=403