kernel error messages during startup (with HKS off)

I'm using a v5.11 based kernel in "next" to work on this.

• HKS all "on": (for the upcoming rebase) we easily get down to the following error messages that are left:

[    0.046059] debugfs: Directory 'dummy-syscon@30340000' with parent 'regmap' already present!
[    0.927927] debugfs: Directory 'dummy-reset-controller@30390000' with parent 'regmap' already present!
[    0.962538] spi_imx 30820000.spi: bitbang start failed with -517
[    3.662065] clk: failed to reparent audio_pll1 to audio_pll1_out: -22
[    3.937627] wm8962 2-001a: ASoC: error at soc_component_read_no_lock on wm8962.2-001a: -16
[    3.946823] wm8962 2-001a: ASoC: error at soc_component_read_no_lock on wm8962.2-001a: -16
[    5.305254] sd 0:0:0:0: [sda] No Caching mode page found
[    5.314240] sd 0:0:0:0: [sda] Assuming drive cache: write through

the debugfs errors have to be fixed at the caller sites (syscon and reset-controller) upstream. the last 2 sd "errors" are long-standing scsi message that probably shouldn't be printed to error. For the remaining 4 I'm not sure yet, but let's keep track of them here.

• HKS all "off": adds these messages:

[    3.874228] st_lsm6dsx_i2c 1-006a: failed to read whoami register
[    3.894339] s5k3l6xx: i2c_read: error during transfer (-6)
[    3.899928] s5k3l6xx 3-002d: model mismatch: 0x80 != 0x30
[    3.908741] s5k3l6xx 3-002d: model mismatch: 0x0 != 0xC6
[    3.914526] s5k3l6xx 3-002d: revision mismatch: 0x0 != 0xB0
[    4.390661] hi846 2-0020: i2c read error: -6
[    4.395076] hi846 2-0020: failed to find sensor: -5

because the IMU and cameras are not powered, but the drivers probe. Suggestions on how to fix this are welcome.