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

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Message-ID: <a0938c62-2b96-447b-b8fb-a9b936b6ba00@BY2FFO11FD049.protection.gbl>
Date:	Mon, 2 Jun 2014 15:28:49 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	Mark Rutland <mark.rutland@....com>,
	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>,
	"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 06/02/2014 03:17 PM, Mark Rutland wrote:
> On Mon, Jun 02, 2014 at 07:25:16AM +0100, Michal Simek wrote:
>> On 05/29/2014 03:19 PM, Mark Rutland wrote:
>>> 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.
>>
>> ok then. Let's use just "xlnx,zynq-wdt-r1p2" compatible string here
>> and remove "cdns,wdt-r1p2"
> 
> That if anything seems backwards -- the driver should jsut take the most
> general string for now: "cdns,wdt-r1p2", while the dtb will have both:
> 
> compatible = "xlnx,zynq-wdt-r1p2", "cdns,wdt-r1p2";
> 
> The driver can later disintguish "xlnx,zynq-wdt-r1p2" specially if
> necessary.

ah. Ok I see your point now. No problem to do it in this way.

Thanks,
Michal



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