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Date: Tue, 8 Sep 2015 14:18:20 +0800
From: Caesar Wang <wxt@...k-chips.com>
To: khilman@...aro.org, heiko@...ech.de
Cc: devicetree@...r.kernel.org, ulf.hansson@...aro.org,
linux@....linux.org.uk, arnd@...db.de,
ijc+devicetree@...lion.org.uk, linus.walleij@...aro.org,
dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org,
dianders@...omium.org, linux-rockchip@...ts.infradead.org,
robh+dt@...nel.org, tomasz.figa@...il.com, mturquette@...libre.com,
linux-arm-kernel@...ts.infradead.org,
Caesar Wang <wxt@...k-chips.com>,
"jinkun.hong" <jinkun.hong@...k-chips.com>
Subject: [PATCH v18 1/4] dt-bindings: add document of Rockchip power domains
This add the necessary binding documentation for the power domains
found on Rockchip SoCs.
Signed-off-by: jinkun.hong <jinkun.hong@...k-chips.com>
Signed-off-by: Caesar Wang <wxt@...k-chips.com>
---
Changes in v18:
- remove the notes of domains from dt-binding.
Changes in v17:
- add the decription in detail for RK3288 SoCs.
Changes in v16:
- remove the pmu node.
Changes in v15: None
Changes in v14: None
Changes in v13: None
Changes in v12: None
Changes in v11: None
Changes in v10: None
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/soc/rockchip/power_domain.txt | 46 ++++++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/rockchip/power_domain.txt
diff --git a/Documentation/devicetree/bindings/soc/rockchip/power_domain.txt b/Documentation/devicetree/bindings/soc/rockchip/power_domain.txt
new file mode 100644
index 0000000..4be3418
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/rockchip/power_domain.txt
@@ -0,0 +1,46 @@
+* 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 SoCs.
+- #power-domain-cells: Number of cells in a power-domain specifier.
+ Should be 1 for multiple PM domains.
+- #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>;
+ #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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