# Re: \[PATCH\] spi: bcm2835: Implement shutdown callback

- From: Florian Fainelli \<f.fainelli@gmail.com\>
- Date: 2020-05-29 17:48:17 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2020/05/5983679
- Thread: https://ratatoskr.run/linux-spi/2020/05/5982340/t.md

```text
On 5/29/20 10:47 AM, Lukas Wunner wrote:
> On Thu, May 28, 2020 at 12:06:05PM -0700, Florian Fainelli wrote:
>> Make sure we clear the FIFOs, stop the block, disable the clock and
>> release the DMA channel.
> 
> To what end?  Why is this change necessary?  Sorry but this seems like
> an awfully terse commit message.

To ensure clocks are disabled and to save power in low power modes used
on 7211 for instance.
-- 
Florian

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