linux-kernel - Re: [PATCH 0/1] Compact interface for Device-Tree

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Message-ID: <7637604.7PK9W8ePf3@vostro.rjw.lan>
Date:	Fri, 31 Oct 2014 23:53:28 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Rob Herring <robherring2@...il.com>
Cc:	Gilad Avidov <gavidov@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sagar Dharia <sdharia@...eaurora.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 0/1] Compact interface for Device-Tree

On Saturday, November 01, 2014 05:13:45 AM Rob Herring wrote:
> On Fri, Oct 31, 2014 at 6:59 AM, Gilad Avidov <gavidov@...eaurora.org> wrote:
> >
> > Device-Tree compact API
> > ------------------------
> >
> > Common code seen in driver’s probe reads device tree values and handling
> > erroneous return codes from all those of_property_read_xxx()  APIs. This
> > common code is factored out by the of_property_map module which allows
> > driver’s probe to replace that (often lengthy) code with a concise table:
> >
> > struct of_prop_map map[] = {
> >     {"i2c",            &dev->id,        OF_REQ,  OF_ID,  -1},
> >     {"qcom,clk-freq-out",    &dev->clk_freq_out,    OF_REQ,  OF_U32,  0},
> >     {"qcom,clk-freq-in",    &dev->clk_freq_in,    OF_REQ,  OF_U32,  0},
> >     {"qcom,disable-dma",    &dev->disable_dma,    OF_OPT,  OF_BOOL, 0},
> >     {"qcom,master-id",    &dev->mstr_id,        OF_SGST, OF_U32,  0},
> >     {NULL,            NULL,            0,       0,       0},
> > };
> >
> > Then call populate to read the values into the device’s variables:
> >
> > ret = of_prop_populate(dev, dev->of_node, map);
> 
> Interesting idea. The main concern I have with this is there has been
> on-going discussions about how to generalize property handling across
> DT and ACPI to make drivers more agnostic, so I'm copying a few folks
> involved in that. That may be a bit orthogonal to what this is doing,
> but we may want some coordination here.

Agreed.

We actually have a patchset adding a unified device property API in linux-next (http://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/log/?h=device-properties)
and I'd prefer to see the "compactization" to happen at that level, if possible,
rather that for of_ only.

Rafael

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