tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1QCOM Secure Channel Manager (SCM)
2
3Qualcomm processors include an interface to communicate to the secure firmware.
4This interface allows for clients to request different types of actions. These
5can include CPU power up/down, HDCP requests, loading of firmware, and other
6assorted actions.
7
8Required properties:
9- compatible: must contain one of the following:
10 * "qcom,scm-apq8064"
11 * "qcom,scm-apq8084"
12 * "qcom,scm-msm8660"
13 * "qcom,scm-msm8916"
14 * "qcom,scm-msm8960"
15 * "qcom,scm-msm8974"
16 * "qcom,scm-msm8996"
17 * "qcom,scm-msm8998"
18 * "qcom,scm-ipq4019"
19 * "qcom,scm-sdm845"
20 and:
21 * "qcom,scm"
22- clocks: Specifies clocks needed by the SCM interface, if any:
23 * core clock required for "qcom,scm-apq8064", "qcom,scm-msm8660" and
24 "qcom,scm-msm8960"
25 * core, iface and bus clocks required for "qcom,scm-apq8084",
26 "qcom,scm-msm8916" and "qcom,scm-msm8974"
27- clock-names: Must contain "core" for the core clock, "iface" for the interface
28 clock and "bus" for the bus clock per the requirements of the compatible.
29- qcom,dload-mode: phandle to the TCSR hardware block and offset of the
30 download mode control register (optional)
31
32Example for MSM8916:
33
34 firmware {
35 scm {
36 compatible = "qcom,msm8916", "qcom,scm";
37 clocks = <&gcc GCC_CRYPTO_CLK> ,
38 <&gcc GCC_CRYPTO_AXI_CLK>,
39 <&gcc GCC_CRYPTO_AHB_CLK>;
40 clock-names = "core", "bus", "iface";
41 };
42 };