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

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Date:	Mon, 4 Jul 2011 00:48:44 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] add missing intialisation of bgc->dir

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.

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.

g.

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