| QCOM Secure Channel Manager (SCM) |
| |
| Qualcomm processors include an interface to communicate to the secure firmware. |
| This interface allows for clients to request different types of actions. These |
| can include CPU power up/down, HDCP requests, loading of firmware, and other |
| assorted actions. |
| |
| Required properties: |
| - compatible: must contain one of the following: |
| * "qcom,scm-apq8064" for APQ8064 platforms |
| * "qcom,scm-msm8660" for MSM8660 platforms |
| * "qcom,scm-msm8690" for MSM8690 platforms |
| * "qcom,scm" for later processors (MSM8916, APQ8084, MSM8974, etc) |
| * "android,firmware" for firmware image |
| * "android,vbmeta" for setting system properties for verified boot. |
| - clocks: One to three clocks may be required based on compatible. |
| * Only core clock required for "qcom,scm-apq8064", "qcom,scm-msm8660", and "qcom,scm-msm8960" |
| * Core, iface, and bus clocks required for "qcom,scm" |
| - clock-names: Must contain "core" for the core clock, "iface" for the interface |
| clock and "bus" for the bus clock per the requirements of the compatible. |
| |
| Example for MSM8916: |
| |
| firmware { |
| scm { |
| compatible = "qcom,scm"; |
| clocks = <&gcc GCC_CRYPTO_CLK> , <&gcc GCC_CRYPTO_AXI_CLK>, <&gcc GCC_CRYPTO_AHB_CLK>; |
| clock-names = "core", "bus", "iface"; |
| }; |
| }; |
| |
| Example for SDM845: |
| |
| firmware { |
| android { |
| compatible = "android,firmware"; |
| vbmeta { |
| compatible = "android,vbmeta"; |
| parts = "vbmeta,boot,system,vendor,dtbo"; |
| }; |
| |
| fstab { |
| compatible = "android,fstab"; |
| vendor { |
| compatible = "android,vendor"; |
| dev = "/dev/block/platform/soc/1d84000.ufshc/by-name/vendor"; |
| type = "ext4"; |
| mnt_flags = "ro,barrier=1,discard"; |
| fsmgr_flags = "wait,slotselect,avb"; |
| }; |
| }; |
| }; |
| }; |