Re: [PATCH v4 5/5] clk: rockchip: rk3588: add GATE_GRF clocks for I2S MCLK output to IO

[Daniele Briguglio]

Hi Diederik,

> md.l 0xfd58c318
> fd58c318: 00000600

Thanks. Bit 0 is clear there, so the I2S0 gate is open at the U-Boot
prompt, after BL31 and before Linux. That matches the symptom: the
firmware on your T6 leaves it open, and the kernel closes it once nothing
references it.

Given that, I think Heiko's suggestion makes sense here. Marking the four
gates CLK_IGNORE_UNUSED keeps the kernel from disabling what the firmware
already left open, and boards that reference _TO_IO still drive it through
the consumer.

Could you test that change if you get a chance? Just set the flag on the
I2S0/1/2/3 _TO_IO gates in clk-rk3588.c and check your analog audio comes
back. The series is already merged, so I'll send the fix as a separate
follow-up patch, this evening if Heiko is fine with the approach.

Best regards,
Daniele