linux-kernel - Re: [PATCH] gpio: omap: Fix interrupt names

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Date:	Thu, 21 Aug 2014 09:37:04 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Nishanth Menon <nm@...com>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Kevin Hilman <khilman@...prootsystems.com>
CC:	<linux-omap@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: omap: Fix interrupt names

On Thursday 21 August 2014 09:19 AM, Nishanth Menon wrote:
> When viewing the /proc/interrupts, there is no information about which
> GPIO bank a specific gpio interrupt is hooked on to. This is more than a
> bit irritating as such information can esily be provided back to the
> user and at times, can be crucial for debug.
> 
> So, instead of displaying something like:
> 31:	0	0  GPIO   0  palmas
> 32:	0	0  GPIO  27  mmc0
> 
> Display the following with appropriate device name:
> 31:	0	0  4ae10000.gpio   0  palmas
> 32:	0	0  4805d000.gpio  27  mmc0
> 
> This requires that we create irq_chip instance specific for each GPIO
> bank which is trivial to achieve.
> 
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
> based on v3.17-rc1
Looks good..
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>

>  drivers/gpio/gpio-omap.c |   31 +++++++++++++++++--------------
>  1 file changed, 17 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index 1749321..aee25fa 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -857,16 +857,6 @@ static void omap_gpio_unmask_irq(struct irq_data *d)
>  	spin_unlock_irqrestore(&bank->lock, flags);
>  }
>  
> -static struct irq_chip gpio_irq_chip = {
> -	.name		= "GPIO",
> -	.irq_shutdown	= omap_gpio_irq_shutdown,
> -	.irq_ack	= omap_gpio_ack_irq,
> -	.irq_mask	= omap_gpio_mask_irq,
> -	.irq_unmask	= omap_gpio_unmask_irq,
> -	.irq_set_type	= omap_gpio_irq_type,
> -	.irq_set_wake	= omap_gpio_wake_enable,
> -};
> -
>  /*---------------------------------------------------------------------*/
>  
>  static int omap_mpuio_suspend_noirq(struct device *dev)
> @@ -1088,7 +1078,7 @@ omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
>  			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
>  }
>  
> -static int omap_gpio_chip_init(struct gpio_bank *bank)
> +static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
>  {
>  	int j;
>  	static int gpio;
> @@ -1137,7 +1127,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank)
>  	}
>  #endif
>  
> -	ret = gpiochip_irqchip_add(&bank->chip, &gpio_irq_chip,
> +	ret = gpiochip_irqchip_add(&bank->chip, irqc,
>  				   irq_base, omap_gpio_irq_handler,
>  				   IRQ_TYPE_NONE);
>  
> @@ -1147,7 +1137,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank)
>  		return -ENODEV;
>  	}
>  
> -	gpiochip_set_chained_irqchip(&bank->chip, &gpio_irq_chip,
> +	gpiochip_set_chained_irqchip(&bank->chip, irqc,
>  				     bank->irq, omap_gpio_irq_handler);
>  
>  	for (j = 0; j < bank->width; j++) {
> @@ -1172,6 +1162,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
>  	const struct omap_gpio_platform_data *pdata;
>  	struct resource *res;
>  	struct gpio_bank *bank;
> +	struct irq_chip *irqc;
>  	int ret;
>  
>  	match = of_match_device(of_match_ptr(omap_gpio_match), dev);
> @@ -1186,6 +1177,18 @@ static int omap_gpio_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  	}
>  
> +	irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
> +	if (!irqc)
> +		return -ENOMEM;
> +
> +	irqc->irq_shutdown = omap_gpio_irq_shutdown,
> +	irqc->irq_ack = omap_gpio_ack_irq,
> +	irqc->irq_mask = omap_gpio_mask_irq,
> +	irqc->irq_unmask = omap_gpio_unmask_irq,
> +	irqc->irq_set_type = omap_gpio_irq_type,
> +	irqc->irq_set_wake = omap_gpio_wake_enable,
> +	irqc->name = dev_name(&pdev->dev);
> +
>  	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>  	if (unlikely(!res)) {
>  		dev_err(dev, "Invalid IRQ resource\n");
> @@ -1241,7 +1244,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
>  
>  	omap_gpio_mod_init(bank);
>  
> -	ret = omap_gpio_chip_init(bank);
> +	ret = omap_gpio_chip_init(bank, irqc);
>  	if (ret)
>  		return ret;
>  
> 

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