linux-kernel - Re: [PATCH v2 1/2] watchdog: Add Cadence WDT driver

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Date:	Thu, 29 May 2014 14:19:40 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Michal Simek <monstr@...str.eu>
Cc:	Harini Katakam <harinik@...inx.com>,
	"wim@...ana.be" <wim@...ana.be>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"michals@...inx.com" <michals@...inx.com>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] watchdog: Add Cadence WDT driver

On Thu, May 29, 2014 at 10:43:05AM +0100, Michal Simek wrote:
> Hi Mark,
> 
> >> +static struct of_device_id cdns_wdt_of_match[] = {
> >> +       { .compatible = "xlnx,zynq-wdt-r1p2", },
> >> +       { .compatible = "cdns,wdt-r1p2", },
> > 
> > If these can currently be handled identically, why not just have
> > "cdns,wdt-r1p2" in the driver and in your dts have:
> > 
> > compatible = "xlnx,zynq-wdt-r1p2", "cdns,wdt-r1p2";
> > 
> > If we need to distinguish the two for some reason later we can always
> > add the "xlnx,zynq-wdt-r1p2" string to the driver.
> 
> I would prefer to have 2 compatible strings just because
> of that we don't know what is different compare to origin cadence
> version. We have done the same for spi-cadence.c that's why
> it shouldn't be any problem to keep it as is.
> Having zynq compatible property here and using it give us option
> that if another SoC vendor come with new configuration or clean
> cadence one we can simple handle it without changing compatible
> property for us.

Sure, we can have two documented strings. But as I mention for the
moment the driver only needs to support the one string so long as a
given dts has both. Then we can later distinguish the zynq variant (or
any other) as necessary.

Cheers,
Mark.
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