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

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Date:	Mon, 4 Jul 2011 17:51:15 +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 Mon, Jul 04, 2011 at 11:37:57AM +0200, Lothar Waßmann wrote:
> > 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.
> 
> It appears that you asked it to send a cover letter, which you usually
> don't want when sending a single patch.  The patch description should
> be part of the git commit itself.
>
Yes, I noticed that already.

> > > 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.
> 
> What device are you using this for.  Are you using the basic gpio
> platform_driver, or do you have a driver using the library part of the
> basic gpio code?
> 
I'm using it via drivers/gpio/gpio-mxc.


Lothar Waßmann
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