linux-kernel - Re: [PATCH] add missing intialisation of bgc->dir

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Date:	Mon, 4 Jul 2011 11:37:57 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] add missing intialisation of bgc->dir

Hi,

Grant Likely writes:
> On Fri, Jul 01, 2011 at 02:08:51PM +0200, Lothar Waßmann wrote:
> > ---
> >  drivers/gpio/basic_mmio_gpio.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c
> > index 8152e9f..e69a453 100644
> > --- a/drivers/gpio/basic_mmio_gpio.c
> > +++ b/drivers/gpio/basic_mmio_gpio.c
> > @@ -399,6 +399,7 @@ int __devinit bgpio_init(struct bgpio_chip *bgc,
> >  		return ret;
> >  
> >  	bgc->data = bgc->read_reg(bgc->reg_dat);
> > +	bgc->dir = bgc->read_reg(bgc->reg_dir);
> 
> Hi Lothar.
> 
> You'll need to double check your email setup.  The patch got emailed
> separately from the description.
> 
git-send-email did that.

> I don't know if this is a valid thing to do or not.  Not every GPIO
> controller supports reading back the initial state from the direction
> register.  I suspect it is better to leave initialization of the
> direction to the gpio controller driver itself.
> 
That would mean, that external software would have to have access to
the bgpio internal data structures which is a Bad Thing(TM) IMO. Or we
need a function that allows to explicitly initialize the internal
shadow registers.



Lothar Waßmann
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