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dmaengine: qcom_hidma: add support for object hierarchy

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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 <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
This commit is contained in:
Sinan Kaya 2016-05-01 00:25:28 -04:00 • committed by Vinod Koul
commit 42d236f8a4
3 changed files with 156 additions and 5 deletions
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9
Documentation/ABI/testing/sysfs-platform-hidma Normal file
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@ -0,0 +1,9 @@
What: /sys/devices/platform/hidma-*/chid
/sys/devices/platform/QCOM8061:*/chid
Date: Dec 2015
KernelVersion: 4.4
Contact: "Sinan Kaya <[email protected]>"
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.