From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lina Iyer Subject: [PATCH 02/14] dt/bindings: update binding for PM domain idle states Date: Wed, 22 Jun 2016 13:36:37 -0600 Message-ID: <1466624209-27432-3-git-send-email-lina.iyer@linaro.org> References: <1466624209-27432-1-git-send-email-lina.iyer@linaro.org> Return-path: In-Reply-To: <1466624209-27432-1-git-send-email-lina.iyer-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, khilman-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org, k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, andy.gross-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org, ahaslam-rdvid1DuHRBWk0Htik3J/w@public.gmane.org, mtitinger-rdvid1DuHRBWk0Htik3J/w@public.gmane.org, Axel Haslam , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Marc Titinger , Lina Iyer List-Id: devicetree@vger.kernel.org From: Axel Haslam Update DT bindings to describe idle states of PM domains. Cc: Signed-off-by: Marc Titinger Signed-off-by: Lina Iyer [Lina: Added state properties, removed state names, wakeup-latency, added of_pm_genpd_init() API, pruned commit text] Signed-off-by: Ulf Hansson [Ulf: Moved around code to make it compile properly, rebased on top of multiple state support] --- .../devicetree/bindings/power/power_domain.txt | 70 ++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt index 025b5e7..41e8dda 100644 --- a/Documentation/devicetree/bindings/power/power_domain.txt +++ b/Documentation/devicetree/bindings/power/power_domain.txt @@ -29,6 +29,43 @@ Optional properties: specified by this binding. More details about power domain specifier are available in the next section. +- power-states : A phandle of an idle-state that shall be soaked into a + generic domain power state. + +==Power state== + +A PM domain power state describes an idle state of a domain and must be +have the following properties - + + - entry-latency-us + Usage: Not required if wakeup-latency-us is provided. + Value type: + Definition: u32 value representing worst case latency in + microseconds required to enter the idle state. + The exit-latency-us duration may be guaranteed + only after entry-latency-us has passed. + + - exit-latency-us + Usage: Not required if wakeup-latency-us is provided. + Value type: + Definition: u32 value representing worst case latency + in microseconds required to exit the idle state. + + - residency-us: + Usage: Optional + Value type: + Definition: A u32 value representing the time for which a + domain must be idle in the state to reap power saving benefits + of entering the state. + + - state-param: + Usage: Optional + Value type: + Definition: A u32 value as defined by the state. May be used + by the driver to hold state related u32 data. In the case of + PSCI, an extended state-id for the domain may be encoded in + this value. + Example: power: power-controller@12340000 { @@ -55,6 +92,39 @@ Example 2: #power-domain-cells = <1>; }; +Example 3: + + pm-domains { + a57_pd: a57_pd@ { + /* will have a57 platform ARM_PD_METHOD_OF_DECLARE*/ + compatible = "arm,pd","arm,cortex-a57"; + #power-domain-cells = <0>; + power-states = <&CLUSTER_SLEEP_0>; + }; + + a53_pd: a53_pd@ { + /* will have a a53 platform ARM_PD_METHOD_OF_DECLARE*/ + compatible = "arm,pd","arm,cortex-a53"; + #power-domain-cells = <0>; + power-states = <&CLUSTER_SLEEP_0>, <&CLUSTER_SLEEP_1>; + }; + + CLUSTER_SLEEP_0: power-state@0 { + entry-latency-us = <1000>; + exit-latency-us = <2000>; + residency-us = <10000>; + state-param = <0x1000010>; + }; + + CLUSTER_SLEEP_1: power-state@1 { + entry-latency-us = <5000>; + exit-latency-us = <5000>; + residency-us = <100000>; + state-param = <0x1000020>; + }; + }; + + The nodes above define two power controllers: 'parent' and 'child'. Domains created by the 'child' power controller are subdomains of '0' power domain provided by the 'parent' power controller. -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html