Clocks used by another OS/CPU (was: Re: [RFC PATCH] clk: renesas: cpg-mssr: Add interface for critical core clocks)
From: Peter De Schrijver <hidden>
Date: 2017-07-04 07:31:37
Also in:
linux-clk, linux-devicetree, linux-pm, linux-renesas-soc
On Mon, Jul 03, 2017 at 10:17:22AM +0100, Sudeep Holla wrote:
On 01/07/17 19:14, Uwe Kleine-K?nig wrote:quoted
Hello, On Sat, Jul 01, 2017 at 07:02:48AM +0200, Dirk Behme wrote:[...]quoted
quoted
The other problem is security related. If, at all, you have to do it the other way around, then: Make Linux a consumer of the other CPU's (trusted/trustzone/whatever secured) OS clock driver.Yes, that's better and is getting common on newer platforms. They have separate M-class(or even low A-class e.g. A5/A7) processors to handle all the system management. The new ARM SCMI specification[0][1] is designed to standardize the interface. It covers the clocks in clock protocol.
Yes, however this doesn't exist on older SoCs which still have multiple CPU's Peter.