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" for APQ8064 platforms
11 * "qcom,scm-msm8660" for MSM8660 platforms
12 * "qcom,scm-msm8690" for MSM8690 platforms
13 * "qcom,scm-msm8996" for MSM8996 platforms
14 * "qcom,scm" for later processors (MSM8916, APQ8084, MSM8974, etc)
15- clocks: One to three clocks may be required based on compatible.
16 * No clock required for "qcom,scm-msm8996"
17 * Only core clock required for "qcom,scm-apq8064", "qcom,scm-msm8660", and "qcom,scm-msm8960"
18 * Core, iface, and bus clocks required for "qcom,scm"
19- clock-names: Must contain "core" for the core clock, "iface" for the interface
20 clock and "bus" for the bus clock per the requirements of the compatible.
21
22Example for MSM8916:
23
24 firmware {
25 scm {
26 compatible = "qcom,scm";
27 clocks = <&gcc GCC_CRYPTO_CLK> , <&gcc GCC_CRYPTO_AXI_CLK>, <&gcc GCC_CRYPTO_AHB_CLK>;
28 clock-names = "core", "bus", "iface";
29 };
30 };