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

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Date:	Mon, 02 Jun 2014 08:25:16 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Mark Rutland <mark.rutland@....com>
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 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"

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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