linux-kernel - Re: [PATCH] gpio: dwapb: Rework support for 1 interrupt per port A GPIO

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Date:   Wed, 23 May 2018 11:12:20 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Phil Edworthy <phil.edworthy@...esas.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Hoan Tran <hotran@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Michel Pollet <michel.pollet@...renesas.com>,
        linux-gpio@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: dwapb: Rework support for 1 interrupt per port A
 GPIO

On Wed, May 23, 2018 at 09:52:44AM +0100, Phil Edworthy wrote:
> Treat DT and ACPI the same as much as possible. Note that we can't use
> platform_get_irq() to get the DT interrupts as they are in the port
> sub-node and hence do not have an associated platform device.
> 
> This also fixes a problem introduced with error checking when calling
> platform_get_irq().

What is the problem? In general I think fixes should be in separate
patches.

> 
> Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
> ---
>  drivers/gpio/gpio-dwapb.c | 53 ++++++++++++++++++++---------------------------
>  1 file changed, 22 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index 7dcd06b..15b4154 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -444,7 +444,7 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
>  		int i;
>  
>  		for (i = 0; i < pp->ngpio; i++) {
> -			if (pp->irq[i])
> +			if (pp->irq[i] >= 0)
>  				irq_set_chained_handler_and_data(pp->irq[i],
>  						dwapb_irq_handler, gpio);
>  		}
> @@ -562,7 +562,7 @@ dwapb_gpio_get_pdata(struct device *dev)
>  	struct dwapb_platform_data *pdata;
>  	struct dwapb_port_property *pp;
>  	int nports;
> -	int i;
> +	int i, j;
>  
>  	nports = device_get_child_node_count(dev);
>  	if (nports == 0)
> @@ -580,6 +580,8 @@ dwapb_gpio_get_pdata(struct device *dev)
>  
>  	i = 0;
>  	device_for_each_child_node(dev, fwnode)  {
> +		struct device_node *np = NULL;
> +
>  		pp = &pdata->properties[i++];
>  		pp->fwnode = fwnode;
>  
> @@ -599,46 +601,35 @@ dwapb_gpio_get_pdata(struct device *dev)
>  			pp->ngpio = 32;
>  		}
>  
> +		pp->irq_shared	= false;
> +		pp->gpio_base	= -1;
> +
>  		/*
>  		 * Only port A can provide interrupts in all configurations of
>  		 * the IP.
>  		 */
> -		if (dev->of_node && pp->idx == 0 &&
> -			fwnode_property_read_bool(fwnode,
> -						  "interrupt-controller")) {
> -			struct device_node *np = to_of_node(fwnode);
> -			unsigned int j;
> -
> -			/*
> -			 * The IP has configuration options to allow a single
> -			 * combined interrupt or one per gpio. If one per gpio,
> -			 * some might not be used.
> -			 */
> -			for (j = 0; j < pp->ngpio; j++) {
> -				int irq = of_irq_get(np, j);
> -				if (irq < 0)
> -					continue;
> -
> -				pp->irq[j] = irq;
> -				pp->has_irq = true;
> -			}
> +		if (pp->idx != 0)
> +			continue;
>  
> -			if (!pp->has_irq)
> -				dev_warn(dev, "no irq for port%d\n", pp->idx);
> +		if (dev->of_node && fwnode_property_read_bool(fwnode,
> +						  "interrupt-controller")) {
> +			np = to_of_node(fwnode);
>  		}
>  
> -		if (has_acpi_companion(dev) && pp->idx == 0) {
> -			unsigned int j;
> +		for (j = 0; j < pp->ngpio; j++) {
> +			pp->irq[j] = -ENXIO;
>  
> -			for (j = 0; j < pp->ngpio; j++) {
> +			if (np)
> +				pp->irq[j] = of_irq_get(np, j);
> +			else if (has_acpi_companion(dev))
>  				pp->irq[j] = platform_get_irq(to_platform_device(dev), j);
> -				if (pp->irq[j])
> -					pp->has_irq = true;
> -			}
> +
> +			if (pp->irq[j] >= 0)
> +				pp->has_irq = true;
>  		}
>  
> -		pp->irq_shared	= false;
> -		pp->gpio_base	= -1;
> +		if (!pp->has_irq)
> +			dev_warn(dev, "no irq for port%d\n", pp->idx);
>  	}
>  
>  	return pdata;
> -- 
> 2.7.4
>