threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
59 lines
1.8 KiB
Plaintext
59 lines
1.8 KiB
Plaintext
Texas Instruments TI-SCI Generic Power Domain
|
|
---------------------------------------------
|
|
|
|
Some TI SoCs contain a system controller (like the PMMC, etc...) that is
|
|
responsible for controlling the state of the IPs that are present.
|
|
Communication between the host processor running an OS and the system
|
|
controller happens through a protocol known as TI-SCI [1].
|
|
|
|
[1] Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
|
|
|
|
PM Domain Node
|
|
==============
|
|
The PM domain node represents the global PM domain managed by the PMMC, which
|
|
in this case is the implementation as documented by the generic PM domain
|
|
bindings in Documentation/devicetree/bindings/power/power_domain.txt. Because
|
|
this relies on the TI SCI protocol to communicate with the PMMC it must be a
|
|
child of the pmmc node.
|
|
|
|
Required Properties:
|
|
--------------------
|
|
- compatible: should be "ti,sci-pm-domain"
|
|
- #power-domain-cells: Must be 1 so that an id can be provided in each
|
|
device node.
|
|
|
|
Example (K2G):
|
|
-------------
|
|
pmmc: pmmc {
|
|
compatible = "ti,k2g-sci";
|
|
...
|
|
|
|
k2g_pds: power-controller {
|
|
compatible = "ti,sci-pm-domain";
|
|
#power-domain-cells = <1>;
|
|
};
|
|
};
|
|
|
|
PM Domain Consumers
|
|
===================
|
|
Hardware blocks belonging to a PM domain should contain a "power-domains"
|
|
property that is a phandle pointing to the corresponding PM domain node
|
|
along with an index representing the device id to be passed to the PMMC
|
|
for device control.
|
|
|
|
Required Properties:
|
|
--------------------
|
|
- power-domains: phandle pointing to the corresponding PM domain node
|
|
and an ID representing the device.
|
|
|
|
See http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data for the list
|
|
of valid identifiers for k2g.
|
|
|
|
Example (K2G):
|
|
--------------------
|
|
uart0: serial@02530c00 {
|
|
compatible = "ns16550a";
|
|
...
|
|
power-domains = <&k2g_pds 0x002c>;
|
|
};
|