linux-kernel - Re: [PATCH|RFC] of: let of_match_device() always return best match

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Message-ID: <52526E46.4030205@pengutronix.de>
Date:	Mon, 07 Oct 2013 10:18:14 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	Fabio Estevam <festevam@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	Grant Likely <grant.likely@...aro.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH|RFC] of: let of_match_device() always return best match

On 10/07/2013 10:17 AM, Lothar Waßmann wrote:
> Hi,
> 
> Marc Kleine-Budde writes:
>> On 10/05/2013 07:46 PM, Fabio Estevam wrote:
>>> Hi Marc,
>>>
>>> On Thu, Oct 3, 2013 at 3:51 PM, Marc Kleine-Budde <mkl@...gutronix.de> wrote:
>>>
>>>> For example:
>>>>
>>>> The imx28.dtsi gives this compatible string for its CAN core:
>>>>
>>>>>       compatible = "fsl,imx28-flexcan", "fsl,p1010-flexcan";
>>>>
>>>> The flexcan driver defines:
>>>>
>>>>> static const struct of_device_id flexcan_of_match[] = {
>>>>>       { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
>>>>>       { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
>>>>>       { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
>>>>>       { /* sentinel */ },
>>>>> };
>>>>
>>>> The "p1010" was the first Freescale SoC with the flexcan core. But this SoC has
>>>> a bug, so a workaround has to be enabled in the driver. The mx28 has this bug
>>>> fixed, so we don't need this quite costly workaround.
>>>
>>> What about defining in imx28.dtsi:
>>> compatible = "fsl,imx28-flexcan".
>>
>> It already works with changing only the driver.
>>
> IMO the change proposed by Fabio is much more sensible. If the imx28
> implementation of the CAN controller is not compatible to p1010 (which
> is obviously true) there is no point in having the "fsl,p1010-flexcan"
> in the DT for imx28.

But it is compatible with the "fsl,p1010-flexcan".

Marc

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