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authorSinan Kaya <okaya@codeaurora.org>2016-05-01 00:25:28 -0400
committerVinod Koul <vinod.koul@intel.com>2016-05-14 11:54:45 +0530
commit42d236f8a4479fefb69b20da3962a462e05a112d (patch)
tree9befbee1b156578123536c530376cef38f2beeba /Documentation/ABI
parent570d0176296f0d17c4b5ab206ad4a4bc027b863b (diff)
downloadop-kernel-dev-42d236f8a4479fefb69b20da3962a462e05a112d.zip
op-kernel-dev-42d236f8a4479fefb69b20da3962a462e05a112d.tar.gz
dmaengine: qcom_hidma: add support for object hierarchy
In order to create a relationship model between the channels and the management object, we are adding support for object hierarchy to the drivers. This patch simplifies the userspace application development. We will not have to traverse different firmware paths based on device tree or ACPI based kernels. No matter what flavor of kernel is used, objects will be represented as platform devices. The new layout is as follows: hidmam_10: hidma-mgmt@0x5A000000 { compatible = "qcom,hidma-mgmt-1.0"; ... hidma_10: hidma@0x5a010000 { compatible = "qcom,hidma-1.0"; ... } } The hidma_mgmt_init detects each instance of the hidma-mgmt-1.0 objects in device tree and calls into the channel driver to create platform devices for each child of the management object. Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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+What: /sys/devices/platform/hidma-*/chid
+ /sys/devices/platform/QCOM8061:*/chid
+Date: Dec 2015
+KernelVersion: 4.4
+Contact: "Sinan Kaya <okaya@cudeaurora.org>"
+Description:
+ Contains the ID of the channel within the HIDMA instance.
+ It is used to associate a given HIDMA channel with the
+ priority and weight calls in the management interface.
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