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| author | Philipp Zabel <p.zabel@pengutronix.de> | 2014-03-06 10:58:44 +0100 |
|---|---|---|
| committer | Nitin Garg <nitin.garg@freescale.com> | 2015-01-15 21:16:29 -0600 |
| commit | f087730befcedd3ae9ca2e7d65352aaec406ba74 (patch) | |
| tree | 83c6b51d3177fb5505b7ecc0593a1f25ff0964f4 /Documentation | |
| parent | ef2c90dea437f8955b7dc089ff1579c2aa06a6b7 (diff) | |
Documentation: Add device tree bindings for Freescale i.MX GPC
The i.MX6 contains a power controller that controls power gating and
sequencing for the SoC's power domains.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
[shawn.guo: http://thread.gmane.org/gmane.linux.drivers.devicetree/64973]
[shawn.guo: update property name to be 'power-domains']
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/power/fsl,imx-gpc.txt | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt b/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt new file mode 100644 index 000000000000..8ff7bce0f596 --- /dev/null +++ b/Documentation/devicetree/bindings/power/fsl,imx-gpc.txt @@ -0,0 +1,54 @@ +Freescale i.MX General Power Controller +======================================= + +The i.MX6Q General Power Control (GPC) block contains DVFS load tracking +counters and Power Gating Control (PGC) for the CPU and PU (GPU/VPU) power +domains. + +Required properties: +- compatible: Should be "fsl,imx6q-gpc" or "fsl,imx6sl-gpc" +- reg: should be register base and length as documented in the + datasheet +- interrupts: Should contain GPC interrupt request 1 +- pu-supply: Link to the LDO regulator powering the PU power domain +- clocks: Clock phandles to devices in the PU power domain that need + to be enabled during domain power-up for reset propagation. +- #power-domain-cells: Should be 1, see below: + +The gpc node is a power-controller as documented by the generic power domain +bindings in Documentation/devicetree/bindings/power/power_domain.txt. + +Example: + + gpc: gpc@020dc000 { + compatible = "fsl,imx6q-gpc"; + reg = <0x020dc000 0x4000>; + interrupts = <0 89 0x04 0 90 0x04>; + pu-supply = <®_pu>; + clocks = <&clks 122>, <&clks 74>, <&clks 121>, + <&clks 26>, <&clks 143>, <&clks 168>; + #power-domain-cells = <1>; + }; + + +Specifying power domain for IP modules +====================================== + +IP cores belonging to a power domain should contain a 'power-domains' property +that is a phandle pointing to the gpc device node and a DOMAIN_INDEX specifying +the power domain the device belongs to. + +Example of a device that is part of the PU power domain: + + vpu: vpu@02040000 { + reg = <0x02040000 0x3c000>; + /* ... */ + power-domains = <&gpc 1>; + /* ... */ + }; + +The following DOMAIN_INDEX values are valid for i.MX6Q: +ARM_DOMAIN 0 +PU_DOMAIN 1 +The following additional DOMAIN_INDEX value is valid for i.MX6SL: +DISPLAY_DOMAIN 2 |