Re: [PATCH v5 3/4] DT/arm,gic-v3-its: add reset-on-suspend property
From: Marc Zyngier <hidden>
Date: 2018-02-07 09:22:06
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linux-pm, lkml
On 07/02/18 01:41, Derek Basehore wrote:
quoted hunk ↗ jump to hunk
This adds documentation for the new reset-on-suspend property. This property enables saving and restoring the ITS for when it loses state in system suspend. Signed-off-by: Derek Basehore <redacted> --- Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt | 3 +++ 1 file changed, 3 insertions(+)diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt index 0a57f2f4167d..a470147d4f14 100644 --- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt +++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt@@ -78,6 +78,9 @@ These nodes must have the following properties: Optional: - socionext,synquacer-pre-its: (u32, u32) tuple describing the untranslated address and size of the pre-ITS window. +- reset-on-suspend: Boolean property. Indicates that the ITS state is + reset on suspend. The state is then saved on suspend and restored on + resume.
By whom? It is important to be clear about the respective responsibilities, as this forms a binding contract between firmware and OS. Mark: Can you have a look at how to formulate this? I'm not sure we have other instances of a non-architected behaviour involving FW participation, aside from PSCI.
The main GIC node must contain the appropriate #address-cells, #size-cells and ranges properties for the reg property of all ITS
Thanks, M. -- Jazz is not dead. It just smells funny...