Kernel-4.18.0-80.el8_qcom,sme

Qualcomm Shared Memory Manager binding

This binding describes the Qualcomm Shared Memory Manager, used to share data
between various subsystems and OSes in Qualcomm platforms.

• compatible:
  Usage: required
  Value type:
  Definition: must be:

        "qcom,smem"
  

• memory-region:
  Usage: required
  Value type:
  Definition: handle to memory reservation for main SMEM memory region.

• qcom,rpm-msg-ram:
  Usage: required
  Value type:
  Definition: handle to RPM message memory resource

• hwlocks:
  Usage: required
  Value type:
  Definition: reference to a hwspinlock used to protect allocations from

        the shared memory
  

= EXAMPLE
The following example shows the SMEM setup for MSM8974, with a main SMEM region
at 0xfa00000 and the RPM message ram at 0xfc428000:

reserved-memory {
    #address-cells = <1>;
    #size-cells = <1>;
    ranges;

    smem_region: smem@fa00000 {
        reg = <0xfa00000 0x200000>;
        no-map;
    };
};

smem@fa00000 {
    compatible = "qcom,smem";

    memory-region = <&smem_region>;
    qcom,rpm-msg-ram = <&rpm_msg_ram>;

    hwlocks = <&tcsr_mutex 3>;
};

soc {
    rpm_msg_ram: memory@fc428000 {
        compatible = "qcom,rpm-msg-ram";
        reg = <0xfc428000 0x4000>;
    };
};