linux-kernel - Re: Grafting old platform drivers onto a new DT kernel

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Message-ID: <yw1xpozj5ezj.fsf@unicorn.mansr.com>
Date:	Mon, 09 Nov 2015 16:12:16 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Mason <slash.tmp@...e.fr>
Cc:	Javier Martinez Canillas <javier@...hile0.org>,
	Andrew Lunn <andrew@...n.ch>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux ARM <linux-arm-kernel@...ts.infradead.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: Grafting old platform drivers onto a new DT kernel

Mason <slash.tmp@...e.fr> writes:

> On 09/11/2015 16:40, Måns Rullgård wrote:
>
>> The simplest solution for you is probably to add a quick and dirty DT
>> binding to the old driver.  If it doesn't use any driver-specific
>> platform data struct, you only need to set .of_match_table in the
>> struct platform_driver.  If there is a platform data struct, you'll also
>> need to write some code to populate it from DT properties.  It shouldn't
>> take more than a few minutes per driver in most cases.
>
> I'll try that approach, although I fear that "a few minutes per driver"
> is an optimistic assessment.

If the driver only needs an MMIO region and an IRQ, it is literally five
lines of code.

-- 
Måns Rullgård
mans@...sr.com
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