linux-kernel - Re: [PATCHv2 6/7] basic_mmio_gpio: support different input/output registers

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Date:	Fri, 8 Apr 2011 18:46:28 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Jamie Iles <jamie@...ieiles.com>
Cc:	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	tglx@...utronix.de, grant.likely@...retlab.ca, arnd@...db.de,
	nico@...xnic.net
Subject: Re: [PATCHv2 6/7] basic_mmio_gpio: support different input/output
 registers

On Fri, Apr 08, 2011 at 03:16:50PM +0100, Jamie Iles wrote:
> Some controllers have separate input and output registers.  For these
> controllers, allow a register named "in" to be used for reading the
> value of a GPIO pin.
> 
> Signed-off-by: Jamie Iles <jamie@...ieiles.com>
> Acked-by: Anton Vorontsov <cbouatmailru@...il.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> ---
>  drivers/gpio/basic_mmio_gpio.c |   31 +++++++++++++++++++++++++++++--
>  1 files changed, 29 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c
> index 9be1867..ed4b0c6 100644
> --- a/drivers/gpio/basic_mmio_gpio.c
> +++ b/drivers/gpio/basic_mmio_gpio.c
> @@ -70,6 +70,7 @@ struct bgpio_chip {
>  	void __iomem *reg_dat;
>  	void __iomem *reg_set;
>  	void __iomem *reg_clr;
> +	void __iomem *reg_in;

Btw, I wonder if it makes sense (and more logical) for separate output/
input registers case to use "reg_dat" for 'input' and 'reg_set' for
output?

I.e. no need for 'reg_in', but instead modify some logic in
bgpio_setup_io(), and implement bgpio_set_set:

	if (res_dat && res_set && !res_clr) {
		bgc->gc.get = bgpio_get_dat;
		bgc->gc.set = bgpio_set_set;
	} else {
		bgc->gc.get = bgpio_get_dat;
		bgc->gc.set = bgpio_set_dat;
	}

Thanks,

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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