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dt-bindings: soc: Add a new binding for the BCM2835 PM node. (v4)

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This binding supersedes the bcm2835-pm-wdt binding which only covered
enough to provide a watchdog, but the HW block is actually mostly
about power domains.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Rob Herring <robh@kernel.org> (v3)
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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Eric Anholt 2018-12-12 15:51:46 -08:00 committed by Stefan Wahren
parent b80ec7c0ef
commit fbeab182b1
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Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-pm.txt Normal file
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BCM2835 PM (Power domains, watchdog)
The PM block controls power domains and some reset lines, and includes
a watchdog timer. This binding supersedes the brcm,bcm2835-pm-wdt
binding which covered some of PM's register range and functionality.
Required properties:
- compatible: Should be "brcm,bcm2835-pm"
- reg: Specifies base physical address and size of the two
register ranges ("PM" and "ASYNC_BRIDGE" in that
order)
- clocks: a) v3d: The V3D clock from CPRMAN
b) peri_image: The PERI_IMAGE clock from CPRMAN
c) h264: The H264 clock from CPRMAN
d) isp: The ISP clock from CPRMAN
- #reset-cells: Should be 1. This property follows the reset controller
bindings[1].
- #power-domain-cells: Should be 1. This property follows the power domain
bindings[2].
Optional properties:
- timeout-sec: Contains the watchdog timeout in seconds
- system-power-controller: Whether the watchdog is controlling the
system power. This node follows the power controller bindings[3].
[1] Documentation/devicetree/bindings/reset/reset.txt
[2] Documentation/devicetree/bindings/power/power_domain.txt
[3] Documentation/devicetree/bindings/power/power-controller.txt
Example:
pm {
compatible = "brcm,bcm2835-pm", "brcm,bcm2835-pm-wdt";
#power-domain-cells = <1>;
#reset-cells = <1>;
reg = <0x7e100000 0x114>,
<0x7e00a000 0x24>;
clocks = <&clocks BCM2835_CLOCK_V3D>,
<&clocks BCM2835_CLOCK_PERI_IMAGE>,
<&clocks BCM2835_CLOCK_H264>,
<&clocks BCM2835_CLOCK_ISP>;
clock-names = "v3d", "peri_image", "h264", "isp";
system-power-controller;
};