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bindings: Add device-tree bindings for hwkm driver

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Add device-tree bindings documentation to describe the
properties of hardware key manager driver.

Change-Id: I15a6fe7e24ca11ade89e4c99ff5d92daedabb65f
This commit is contained in:
Gaurav Kashyap
2020-02-20 11:25:42 -08:00
parent 638c5be7d0
commit fd94f1100f
1 changed files with 28 additions and 0 deletions
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bindings/firmware/qcom/hwkm.txt Normal file
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HWKM (Hardware Key Manager)
The HWKM driver is a platform device driver that helps
communicating with both the master and slave blocks of the
hardware key manager to issue commands to perform key operations
mainly required for storage encryption.
Required properties:
- compatible : Should be "qcom,hwkm".
- reg: Register set for both master and slaves.
- reg-names : Identifiers for parsing master and slave regs.
- clocks : clocks needed for operating master and the slave.
- clock-names : name identifiers corresponding to the clocks.
- qcom,enable-hwkm-clk: to ensure clocks can be handled by HLOS.
- qcom,op-freq-hz: Max frequency of the listed clocks.
Example:
qcom_hwkm: hwkm@10c0000 {
compatible = "qcom,hwkm";
reg = <0x10c0000 0x9000>, <0x1d90000 0x9000>;
reg-names = "km_master", "ice_slave";
qcom,enable-hwkm-clk;
clock-names = "km_clk_src";
clocks = <&clock_rpmh RPMH_HWKM_CLK>;
qcom,op-freq-hz = <75000000>;
};