iio: adc: aspeed: Fix the calculate error of clock.

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The ADC clock formula is
ast2400/2500:
ADC clock period = PCLK * 2 * (ADC0C[31:17] + 1) * (ADC0C[9:0] + 1)
ast2600:
ADC clock period = PCLK * 2 * (ADC0C[15:0] + 1)
They all have one fixed divided 2 and the legacy driver didn't handle it.
This patch register the fixed factory clock device as the parent of ADC
clock scaler to fix this issue.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20210922081520.30580-8-billy_tsai@aspeedtech.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Billy Tsai 2021-09-22 16:15:16 +08:00 • committed by Jonathan Cameron

parent 1b5ceb55fe

commit 90f9647753

1 changed files with 27 additions and 0 deletions

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drivers/iio/adc/aspeed_adc.c

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