linux-kernel - Re: [PATCH V2 1/3] dma: add Qualcomm Technologies HIDMA management driver

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Date:	Mon, 2 Nov 2015 11:26:46 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	Sinan Kaya <okaya@...eaurora.org>, Rob Herring <robh+dt@...nel.org>
Cc:	dmaengine@...r.kernel.org,
	Christopher Covington <cov@...eaurora.org>,
	"jcm@...hat.com" <jcm@...hat.com>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/3] dma: add Qualcomm Technologies HIDMA management
 driver

On 11/02/2015 10:20 AM, Sinan Kaya wrote:
>>
> Is there a good example I can look or a wiki about the device-tree
> naming conventions?
>
> I'm more of an ACPI person than DTS.

I think Rob is talking about something like this:

	compatible="qcom,hidma-mgmt-1.0", "qcom,hidma-mgmt"

This specifies that this is the v1.0 of the HIDMA management engine (or, 
the management engine for the 1.0 HIDMA device).  That way, if in the 
future there's a v1.1, you can do this:

	compatible="qcom,hidma-mgmt-1.1", "qcom,hidma-mgmt"

The driver will probe only on ""qcom,hidma-mgmt", but in the probe 
function, it can query the version number and act accordingly.

Alternatively, the driver can probe on both:

static const struct of_device_id hidma_match[] = {
	{ .compatible = "qcom,hidma-mgmt-1.0", &v10_struct},
	{ .compatible = "qcom,hidma-mgmt-1.1", &v11_struct},
	{},
};
MODULE_DEVICE_TABLE(of, hidma_match);

And then the probe function will automatically get a pointer to either 
v10_struct or v11_struct.
	
-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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