Re: [PATCH v2 3/6] dt-bindings: soc: qcom: Add RSC power domain specifier

From: Maulik Shah
Date: Tue Sep 03 2019 - 04:44:48 EST

On 8/28/2019 4:02 AM, Rob Herring wrote:
On Fri, Aug 23, 2019 at 01:47:00PM +0530, Maulik Shah wrote:
In addition to transmitting resource state requests to the remote
processor, the RSC is responsible for powering off/lowering the
requirements from CPUs subsystem for the associated hardware like
buses, clocks, and regulators when all CPUs and cluster is powered down.

The power domain is configured to a low power state and when all the
CPUs are powered down, the RSC can lower resource state requirements
and power down the rails that power the CPUs.

Add PM domain specifier property for RSC controller.

Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt b/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
index 9b86d1eff219..d0ab6e9b6745 100644
--- a/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
+++ b/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
@@ -83,6 +83,13 @@ Properties:
Value type: <string>
Definition: Name for the RSC. The name would be used in trace logs.
+- #power-domain-cells:
+ Usage: optional
+ Value type: <u32>
+ Definition: Number of cells in power domain specifier. Optional for
+ controllers that may be in 'solver' state where they can
+ be in autonomous mode executing low power modes.
What's the value? It's always 0?

yes. its value is always 0. i will update definition to mention this in next version.

Drivers that want to use the RSC to communicate with RPMH must specify their
bindings as child nodes of the RSC controllers they wish to communicate with.
@@ -112,6 +119,7 @@ TCS-OFFSET: 0xD00
+ #power-domain-cells = <0>;
Example 2:
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation.

QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation