linux-kernel - Re: [PATCH V3 2/4] dma: add Qualcomm Technologies HIDMA management driver

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Message-ID: <20151109182514.GA10896@rob-hp-laptop>
Date:	Mon, 9 Nov 2015 12:25:14 -0600
From:	Rob Herring <robh@...nel.org>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	Timur Tabi <timur@...eaurora.org>, dmaengine@...r.kernel.org,
	cov@...eaurora.org, jcm@...hat.com, agross@...eaurora.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 2/4] dma: add Qualcomm Technologies HIDMA management
 driver

On Sun, Nov 08, 2015 at 09:17:20PM -0500, Sinan Kaya wrote:
> On 11/8/2015 12:08 AM, Timur Tabi wrote:
> 
> On 11/8/2015 12:08 AM, Timur Tabi wrote:
> >Sinan Kaya wrote:
> >>+    val = val & ~(MAX_BUS_REQ_LEN_MASK << MAX_BUS_WR_REQ_BIT_POS);
> >>+    val = val | (mgmtdev->max_write_request << MAX_BUS_WR_REQ_BIT_POS);
> >>+    val = val & ~(MAX_BUS_REQ_LEN_MASK);
> >>+    val = val | (mgmtdev->max_read_request);
> >
> >val &= ~MAX_BUS_REQ_LEN_MASK << MAX_BUS_WR_REQ_BIT_POS;
> >val |= mgmtdev->max_write_request << MAX_BUS_WR_REQ_BIT_POS;
> >val &= ~MAX_BUS_REQ_LEN_MASK;
> >val |= mgmtdev->max_read_request;
> >
> >>+static const struct of_device_id hidma_mgmt_match[] = {
> >>+    { .compatible = "qcom,hidma-mgmt", },
> >>+    { .compatible = "qcom,hidma-mgmt-1.0", },
> >>+    { .compatible = "qcom,hidma-mgmt-1.1", },
> >>+    {},
> >>+};
> >
> >I thought Rob said that he did NOT want to use version numbers in
> >compatible strings.  And what's the difference between these three
> >versions anyway?
> >
> 
> This was already discussed here.
> 
> https://lkml.org/lkml/2015/11/2/689
> 
> The agreement was to use

The suggestion...
 
> compatible = "qcom,hidma-mgmt-1.1", "qcom,hidma-mgmt-1.0",
> "qcom,hidma-mgmt";

I don't really want to see 3 generic-ish strings.
 
> I'll be adding code for v1.1 specifically in the future.

Please drop "qcom,hidma-mgmt" altogether. It is already meaningless. 
Then add the 1.1 compatible when you add the code for it. Hopefully you 
all can decide on part number(s) by then.

Rob
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