Re: [PATCH] spi: bcm2835: do not unregister controller in shutdown handler
From: Jason Gunthorpe <jgg@ziepe.ca>
Date: 2021-10-04 17:35:36
Also in:
linux-integrity, linux-spi, lkml, stable
On Mon, Oct 04, 2021 at 06:27:29PM +0100, Mark Brown wrote:
On Mon, Oct 04, 2021 at 02:13:01PM -0300, Jason Gunthorpe wrote:quoted
I'm kind of surprised a scheme like this didn't involve a FW call after Linux is done with the CPUs to quiet all the HW and let it sleep, I've built things that way before at least.That's a *lot* of code to put in firmware if you can't physically power most of the system down.
Maybe? The chip I worked on we just made a list of register/value pairs that covered all the functional blocks and the FW ran down the list. Mind you the chip was designed that poking ABC to reg 123 turned the unit off no matter what. It didn't have a complex interactive shutdown sequence. Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel