linux-kernel - Re: [RFC PATCH] mfd: arizona: Update device tree regulator bindings

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Message-ID: <20130929180906.GX3635@opensource.wolfsonmicro.com>
Date:	Sun, 29 Sep 2013 19:09:06 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	devicetree@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mfd: arizona: Update device tree regulator bindings

On Sun, Sep 29, 2013 at 06:52:36PM +0100, Mark Brown wrote:
> On Sun, Sep 29, 2013 at 03:11:37PM +0100, Charles Keepax wrote:
> 
> > There is currently only one other MFD driver (tps65910) which defines
> > the GPIOs on the main MFD node as we do in the Arizona driver and it
> > uses the 'hack' that I suggested in my first email of copying the
> > of_node.
> 
> > tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node;
> 
> Look where it's copying it to - this isn't the hack you were suggesting
> before.  What you were suggesting before was setting the of_node of the
> child struct device which is a managed thing that the driver core knows
> about, the device is the owner of the of_node hanging off it.  You would
> end up with the same of_node referenced from two struct devices which
> isn't clever.  The above is putting a pointer into the gpio_chip which
> is just telling gpiolib that it should use this of_node when it needs
> one, gpiolib won't try and lifecycle manage the of_node.

Ah, of course, I see now.


Thanks,
Charles

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