Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1423919

[PATCH v2 2/3] Documentation: add DT bindings for ARM SCPI power domains

From Sudeep Holla <sudeep.holla@arm.com>
Newsgroups linux.kernel
Subject [PATCH v2 2/3] Documentation: add DT bindings for ARM SCPI power domains
Date 2016-06-16 12:40 +0200
Message-ID <rKCSm-7c3-31@gated-at.bofh.it> (permalink)
References <rKCSm-7c3-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

The System Control Processor (SCP) provides peripheral devices with
power domains that can be enabled and disabled viathe System Control
and Power Interface (SCPI) Message Protocol. Add bindings to allow
probing of these device power domians.

Cc: Rob Herring <robh+dt@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 Documentation/devicetree/bindings/arm/arm,scpi.txt | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/arm,scpi.txt b/Documentation/devicetree/bindings/arm/arm,scpi.txt
index 313dabdc14f9..faa4b44572e3 100644
--- a/Documentation/devicetree/bindings/arm/arm,scpi.txt
+++ b/Documentation/devicetree/bindings/arm/arm,scpi.txt
@@ -87,10 +87,33 @@ SCPI provides an API to access the various sensors on the SoC.
 			 implementation for the IDs to use. For Juno
 			 R0 and Juno R1 refer to [3].

+Power domain bindings for the power domains based on SCPI Message Protocol
+------------------------------------------------------------
+
+This binding uses the generic power domain binding[4].
+
+PM domain providers
+===================
+
+Required properties:
+ - #power-domain-cells : Should be 1. Contains the device or the power
+			 domain ID value used by SCPI commands.
+ - num-domains: Total number of power domains provided by SCPI. This is
+		needed as the SCPI message protocol lacks a mechanism to
+		query this information at runtime.
+
+PM domain consumers
+===================
+
+Required properties:
+ - power-domains : A phandle and PM domain specifier as defined by bindings of
+                   the power controller specified by phandle.
+
 [0] http://infocenter.arm.com/help/topic/com.arm.doc.dui0922b/index.html
 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
 [2] Documentation/devicetree/bindings/thermal/thermal.txt
 [3] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0922b/apas03s22.html
+[4] Documentation/devicetree/bindings/power/power_domain.txt

 Example:

@@ -144,6 +167,12 @@ scpi_protocol: scpi@2e000000 {
 		compatible = "arm,scpi-sensors";
 		#thermal-sensor-cells = <1>;
 	};
+
+	scpi_devpd: scpi-power-domains {
+		compatible = "arm,scpi-power-domains";
+		num-domains = <2>;
+		#power-domain-cells = <1>;
+	};
 };

 cpu@0 {
@@ -156,6 +185,7 @@ hdlcd@7ff60000 {
 	...
 	reg = <0 0x7ff60000 0 0x1000>;
 	clocks = <&scpi_clk 4>;
+	power-domains = <&scpi_devpd 1>;
 };

 thermal-zones {
@@ -186,3 +216,7 @@ The thermal-sensors property in the soc_thermal node uses the
 temperature sensor provided by SCP firmware to setup a thermal
 zone. The ID "3" is the sensor identifier for the temperature sensor
 as used by the firmware.
+
+The num-domains property in scpi-power-domains domain specifies that
+SCPI provides 2 power domains. The hdlcd node uses the power domain with
+domain ID 1.
--
2.7.4

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
  [PATCH v2 3/3] firmware: scpi: add device power domain support using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-16 19:50 +0200
      Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 20:00 +0200
        Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-17 10:20 +0200
          Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 10:40 +0200
          Re: [PATCH v2 3/3] firmware: scpi: add device power domain support using genpd Kevin Hilman <khilman@baylibre.com> - 2016-06-20 20:00 +0200
            Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-20 20:00 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 11:00 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 11:00 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support  using genpd Sudeep Holla <sudeep.holla@arm.com> - 2016-06-20 21:30 +0200
    Re: [PATCH v2 3/3] firmware: scpi: add device power domain support using genpd Kevin Hilman <khilman@baylibre.com> - 2016-06-21 00:00 +0200
  [PATCH v2 2/3] Documentation: add DT bindings for ARM SCPI power domains Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
  [PATCH v2 1/3] firmware: arm_scpi: add support for device power state management Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 12:40 +0200
    Re: [PATCH v2 1/3] firmware: arm_scpi: add support for device power  state management "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-16 20:10 +0200
      Re: [PATCH v2 1/3] firmware: arm_scpi: add support for device power  state management Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 10:50 +0200
  Re: [PATCH v2 0/3] firmware: scpi: add device power domain support "Jon Medhurst (Tixy)" <tixy@linaro.org> - 2016-06-16 15:20 +0200
    Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-16 15:30 +0200
      Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Ulf Hansson <ulf.hansson@linaro.org> - 2016-06-17 11:00 +0200
  Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Mathieu Poirier <mathieu.poirier@linaro.org> - 2016-06-17 17:30 +0200
    Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-17 17:40 +0200
  Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Kevin Hilman <khilman@baylibre.com> - 2016-06-20 20:00 +0200
    Re: [PATCH v2 0/3] firmware: scpi: add device power domain support Sudeep Holla <sudeep.holla@arm.com> - 2016-06-20 20:10 +0200

csiph-web