linux-kernel - Re: [PATCH 1/4 v2] gpio/tc3589x: convert to use the simple irqdomain

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Message-Id: <20121121150052.9A5323E0A47@localhost>
Date:	Wed, 21 Nov 2012 15:00:52 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 1/4 v2] gpio/tc3589x: convert to use the simple irqdomain

On Fri, 19 Oct 2012 12:53:45 +0200, Linus Walleij <linus.walleij@...aro.org> wrote:
> The special checks for whether we have a base IRQ offset or not
> is surplus if we use the simple IRQ domain. The IRQ offset
> zero will be interpreted as a linear domain case.
> 
> Plus this makes sure we allocate descriptors where need be, or
> warn if they are preallocated with SPARSE_IRQ.
> 
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Applied, thanks.

g.

> ---
> ChangeLog v1->v2: add a comment that explains what is going on,
>   it fooled me so it could fool somebody else too.
> ---
>  drivers/gpio/gpio-tc3589x.c | 20 +++++++++-----------
>  1 file changed, 9 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c
> index 1e48317..8c8447c 100644
> --- a/drivers/gpio/gpio-tc3589x.c
> +++ b/drivers/gpio/gpio-tc3589x.c
> @@ -292,17 +292,15 @@ static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio,
>  {
>  	int base = tc3589x_gpio->irq_base;
>  
> -	if (base) {
> -		tc3589x_gpio->domain = irq_domain_add_legacy(
> -			NULL, tc3589x_gpio->chip.ngpio, base,
> -			0, &tc3589x_irq_ops, tc3589x_gpio);
> -	}
> -	else {
> -		tc3589x_gpio->domain = irq_domain_add_linear(
> -			np, tc3589x_gpio->chip.ngpio,
> -			&tc3589x_irq_ops, tc3589x_gpio);
> -	}
> -
> +	/*
> +	 * If this results in a linear domain, irq_create_mapping() will
> +	 * take care of allocating IRQ descriptors at runtime. When a base
> +	 * is provided, the IRQ descriptors will be allocated when the
> +	 * domain is instantiated.
> +	 */
> +	tc3589x_gpio->domain = irq_domain_add_simple(np,
> +			tc3589x_gpio->chip.ngpio, base, &tc3589x_irq_ops,
> +			tc3589x_gpio);
>  	if (!tc3589x_gpio->domain) {
>  		dev_err(tc3589x_gpio->dev, "Failed to create irqdomain\n");
>  		return -ENOSYS;
> -- 
> 1.7.11.7
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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