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Commit af059d88 authored by Manoj Prabhu B's avatar Manoj Prabhu B
Browse files

memshare: Add snapshot of memshare dt documentation 



The patch is a snapshot of memshare driver dt documentation
taken from msm-4.14 commit <460b918c8d6d9>
(Merge "net: aquantia: support for 32-bit ARM target").

Change-Id: I52c85cedd981b085c4c4d970c7631727a501c9de
Signed-off-by: default avatarManoj Prabhu B <bmanoj@codeaurora.org>
parent 4b3fae08

Documentation/devicetree/bindings/arm/msm/heap-sharing.txt

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+65 −0
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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";

	};

};
 
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