[RFC PATCH 4/6] devicetree: bindings: add documentation for voltagedomain
From: Nishanth Menon <nm@ti.com>
Date: 2014-02-18 20:37:04
Also in:
linux-arm-kernel, linux-omap, linux-pm, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Add documentation for voltage domain binding format. Specific voltage domains will have bindings corresponding to them. Signed-off-by: Nishanth Menon <nm@ti.com> --- .../bindings/power/voltdm/voltage_domain.txt | 65 ++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/voltdm/voltage_domain.txt
diff --git a/Documentation/devicetree/bindings/power/voltdm/voltage_domain.txt b/Documentation/devicetree/bindings/power/voltdm/voltage_domain.txt
new file mode 100644
index 0000000..da48a19
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/voltdm/voltage_domain.txt@@ -0,0 +1,65 @@ +Specifying Voltage Domain information for devices +================================================= + +1. Specifying a voltage domain. + +SoCs may have multiple voltage domains under which various clocks operate. + +Mandatory Properties: +- #voltdm-cells - indicates if there are specifiers needed to reference the + voltage domain + +Optional Properties: +- voltage-tolerance: Specify the voltage tolerance in percentage + +2. Voltage domain consumer +consumer nodes can be reference using the below binding: +- <name>-voltdm: phandle to the voltage domain node. + +Examples: + +A. Voltage Domain controlling multiple regulator +voltage_domain_mpu: voltdm@1 { + compatible = "xyz"; + #voltdm-cells = <0>; + vdd-supply = <&vcc>; + vbb-supply = <&abb_mpu>; + ... +}; + +voltage_domain_gpu: voltdm@2 { + compatible = "xyz"; + #voltdm-cells = <0>; + vdd-supply = <&dcdc2>; + vbb-supply = <&abb_gpu>; + ... +}; +... +&cpu0 { + cpu0-voltdm = <&voltage_domain_mpu>; + voltage-tolerance = <1>; +}; + +&gpu { + gpu-voltdm = <&voltage_domain_gpu>; +}; + +B. Indexed voltage domain device + +#define SOC_XYZ_VOLTAGE_DOMAIN_MPU 0 +#define SOC_XYZ_VOLTAGE_DOMAIN_GFX 1 + +voltage_domain_socx: voltdm@1 { + compatible = "abc"; + #voltdm-cells = <1>; + ... +}; +... +&cpu0 { + cpu0-voltdm = <&voltage_domain_socx SOC_XYZ_VOLTAGE_DOMAIN_MPU>; + voltage-tolerance = <1>; +}; + +&gpu { + gpu-voltdm = <&voltage_domain_socx SOC_XYZ_VOLTAGE_DOMAIN_GFX>; +};
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1.7.9.5