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ARM: dts: msm: Add snapshot of memshare dt documentation

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The patch is a snapshot of memshare driver dt documentation
taken from msm-4.19 commit
<ea70d133e2> (Merge "ARM: dts: msm: limit gear to 3
for Lahaina").

Change-Id: Ia4030191f5d270d905ee78104ad8f5b78dfa6108
This commit is contained in:
Manoj Prabhu B 2020-02-18 16:27:31 +05:30
commit 7c7a845b4d
1 changed files with 65 additions and 0 deletions
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65
bindings/arm/msm/heap-sharing.txt Normal file
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* Memory Share Driver (MEMSHARE)
The Memshare driver implements a Kernel QMI service on the
LA-APSS, which is responsible for providing contiguous physical
memory to MPSS for use cases when the modem requires additional
memory (e.g. GPS).
Required properties for Memshare
-Root Node-
- compatible: Must be "qcom,memshare"
Required properties for child nodes:
- compatible: Must be "qcom,memshare-peripheral"
- qcom,peripheral-size: Indicates the size (in bytes) required for that child.
- qcom,client-id: Indicates the client id of the child node.
- label: Indicates the peripheral information for the node. Should be one of
the following:
- modem /* Represent Modem Peripheral */
- adsp /* Represent ADSP Peripheral */
- wcnss /* Represent WCNSS Peripheral */
Optional properties for child nodes:
- qcom,allocate-boot-time: Indicates whether clients needs boot time memory allocation.
- qcom,allocate-on-request: Indicates memory allocation happens only upon client request
Note: qcom,allocate-boot-time and qcom,allocate-on-request are mutually exclusive rite now.
- qcom,guard-band: Indicates addition of a guard band memory allocation in addition to the client's memory region.
Example 1:
qcom,memshare {
compatible = "qcom,memshare";
qcom,client_1 {
compatible = "qcom,memshare-peripheral";
qcom,peripheral-size = <0x200000>;
qcom,client-id = <0>;
qcom,allocate-boot-time;
label = "modem";
};
};
Example 2:
qcom,memshare {
compatible = "qcom,memshare";
qcom,client_3 {
compatible = "qcom,memshare-peripheral";
qcom,peripheral-size = <0x500000>;
qcom,client-id = <1>;
qcom,allocate-on-request;
qcom,guard-band;
label = "modem";
};
};