linux-kernel - [PATCH v9 1/3] dt-bindings: add document of Rockchip power domain

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Message-Id: <1415336010-31663-2-git-send-email-caesar.wang@rock-chips.com>
Date:	Fri,  7 Nov 2014 12:53:28 +0800
From:	Caesar Wang <caesar.wang@...k-chips.com>
To:	linus.walleij@...aro.org, linux-arm-kernel@...ts.infradead.org,
	Heiko Stuebner <heiko@...ech.de>,
	Russell King <linux@....linux.org.uk>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-doc@...r.kernel.org, dianders@...omium.org,
	linux-rockchip@...ts.infradead.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	fzf@...k-chips.com, cf@...k-chips.com, caesar.wang@...k-chips.com,
	Jack Dai <jack.dai@...k-chips.com>,
	"jinkun.hong" <jinkun.hong@...k-chips.com>
Subject: [PATCH v9 1/3] dt-bindings: add document of Rockchip power domain

This add the necessary binding documentation for the power domain
found on Rockchip Socs.

Signed-off-by: Jack Dai <jack.dai@...k-chips.com>
Signed-off-by: jinkun.hong <jinkun.hong@...k-chips.com>
Signed-off-by: Caesar Wang <caesar.wang@...k-chips.com>

---

Changes in v9:
    - add document decription

Changes in v8:
    - document go back to v2

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3:
    - DT structure has changed

Changes in v2:
    - move clocks to "optional"

 .../bindings/arm/rockchip/power_domain.txt         | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/rockchip/power_domain.txt

diff --git a/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt b/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt
new file mode 100644
index 0000000..3e74e6d
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/rockchip/power_domain.txt
@@ -0,0 +1,48 @@
+* Rockchip Power Domains
+
+Rockchip processors include support for multiple power domains which can be
+powered up/down by software based on different application scenes to save power.
+
+Required properties for power domain controller:
+- compatible: should be one of the following.
+    * rockchip,rk3288-power-controller - for rk3288 type power domain.
+- #power-domain-cells: Number of cells in a power-domain specifier.
+		       should be 1.
+- rockchip,pmu: phandle referencing a syscon providing the pmu registers
+- #address-cells: should be 1.
+- #size-cells: should be 0.
+
+Required properties for power domain sub nodes:
+- reg: index of the power domain, should use macros in:
+    *  include/dt-bindings/power-domain/rk3288.h - for rk3288 type power domain.
+- clocks (optional): phandles to clocks which need to be enabled while power domain
+          switches state.
+
+Example:
+
+	power: power-controller {
+	       compatible = "rockchip,rk3288-power-controller";
+	       #power-domain-cells = <1>;
+	       rockchip,pmu = <&pmu>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+	       pd_gpu {
+	               reg = <RK3288_PD_GPU>;
+	               clocks = <&cru ACLK_GPU>;
+	       };
+	};
+
+Node of a device using power domains must have a power-domains property,
+containing a phandle to the power device node and an index specifying which
+power domain to use.
+The index should use macros in:
+   * include/dt-bindings/power-domain/rk3288.h - for rk3288 type power domain.
+
+Example of the node using power domain:
+
+	node {
+		/* ... */
+		power-domains = <&power RK3288_PD_GPU>;
+		/* ... */
+	};
-- 
1.9.1


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