Re: [PATCH 2/4] iio: adc: at91-sama5d2: initialize hardware after clock is started

[Jonathan Cameron]

On Mon, 1 Mar 2021 16:32:54 +0200
Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> wrote:

> The hw_init hardware init call must happen after the clock is prepared and
> enabled. Otherwise, writing to the registers might lead to a block or
> external abort.

Fix for existing parts or something only needed for the new devices?
If it's a fix we should be looking to back port it so please
provide me with a fixes tag.

If it's a fix but not super urgent then let me know and we can
take it with the rest of this series (and hence keep things simple)

Thanks,

Jonathan

> 
> Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
> ---
>  drivers/iio/adc/at91-sama5d2_adc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index a7826f097b95..63325f037f09 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -1832,12 +1832,12 @@ static int at91_adc_probe(struct platform_device *pdev)
>  		goto vref_disable;
>  	}
>  
> -	at91_adc_hw_init(indio_dev);
> -
>  	ret = clk_prepare_enable(st->per_clk);
>  	if (ret)
>  		goto vref_disable;
>  
> +	at91_adc_hw_init(indio_dev);
> +
>  	platform_set_drvdata(pdev, indio_dev);
>  
>  	ret = at91_adc_buffer_and_trigger_init(&pdev->dev, indio_dev);