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author | Bjorn Andersson <bjorn.andersson@sonymobile.com> | 2015-06-26 14:50:09 -0700 |
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committer | Andy Gross <agross@codeaurora.org> | 2015-10-08 15:47:48 -0500 |
commit | 93aaf76a6cd729ecdbbd764f5640b1d50d372bbb (patch) | |
tree | c7ab2276c1bc4d2e502be9b7f6b6695094948316 /Documentation/devicetree/bindings/soc | |
parent | 6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff) | |
download | linux-93aaf76a6cd729ecdbbd764f5640b1d50d372bbb.tar.bz2 |
soc: qcom: Add device tree binding for SMEM
Add device tree binding documentation for the Qualcom Shared Memory
Manager.
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>
Diffstat (limited to 'Documentation/devicetree/bindings/soc')
-rw-r--r-- | Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt new file mode 100644 index 000000000000..9326cdf6e1b1 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt @@ -0,0 +1,57 @@ +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: <stringlist> + Definition: must be: + "qcom,smem" + +- memory-region: + Usage: required + Value type: <prop-encoded-array> + Definition: handle to memory reservation for main SMEM memory region. + +- qcom,rpm-msg-ram: + Usage: required + Value type: <prop-encoded-array> + Definition: handle to RPM message memory resource + +- hwlocks: + Usage: required + Value type: <prop-encoded-array> + 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>; + }; + }; |