linux-kernel - Re: [PATCH v2] MFD: ab8500: pass AB8500 IRQ to debugfs code by resource

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Date:	Fri, 12 Apr 2013 17:03:53 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Anmar Oueja <anmar.oueja@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] MFD: ab8500: pass AB8500 IRQ to debugfs code by
 resource

Code looks good.

Feel free to add my Ack or whathaveyou, after you've fixed-up the typos.

> From: Linus Walleij <linus.walleij@...aro.org>
> 
> The AB8500 debug code which was merged in parallell with the

Typo

> multiplatform work incidentally introduced a new instance using
> the <mach/irqs.h> header which is now deleted, causing this
> build regression:
> 
> drivers/mfd/ab8500-debugfs.c:95:23:
> fatal error: mach/irqs.h: No such file or directory
> compilation terminated.
> make[4]: *** [drivers/mfd/ab8500-debugfs.o] Error 1
> 
> The code most certainly never worked with device tree either
> since that does not rely on this kind of hard-coded interrupt
> numbers.
> 
> Fix the problem at the root by passing it as a named resource
> from the ab8500-core driver. Use an untyped resource to
> stop the MFD core from remapping this IRQ relative to the
> AB8500 irqdomain.
> 
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> ChangeLog v1->v2:
> - Pass an untyped resource to avoid problems due to IRQ
>   remapping.
> 
> Sam this would have to go into the v3.10-targetted stuff...
> Either immediately before you send it upstream or as a fixup.
> ---
>  drivers/mfd/ab8500-core.c    | 15 +++++++++++++++
>  drivers/mfd/ab8500-debugfs.c | 16 ++++++++++++----
>  2 files changed, 27 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
> index 8e8a016..65cd46b 100644
> --- a/drivers/mfd/ab8500-core.c
> +++ b/drivers/mfd/ab8500-core.c
> @@ -868,6 +868,15 @@ static struct resource ab8500_chargalg_resources[] = {};
>  #ifdef CONFIG_DEBUG_FS
>  static struct resource ab8500_debug_resources[] = {
>  	{
> +		.name	= "IRQ_AB8500",
> +		/*
> +		 * Number will be filled in. NOTE: this is deliberately
> +		 * not flagged as an IRQ in ordet to avoid remapping using

typo

> +		 * the irqdomain in the MFD core, so that this IRQ passes
> +		 * unremapped to the debug code.
> +		 */
> +	},
> +	{
>  		.name	= "IRQ_FIRST",
>  		.start	= AB8500_INT_MAIN_EXT_CH_NOT_OK,
>  		.end	= AB8500_INT_MAIN_EXT_CH_NOT_OK,
> @@ -1712,6 +1721,12 @@ static int ab8500_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> +#if CONFIG_DEBUG_FS
> +	/* Pass to debugfs */
> +	ab8500_debug_resources[0].start = ab8500->irq;
> +	ab8500_debug_resources[0].end = ab8500->irq;
> +#endif
> +
>  	if (is_ab9540(ab8500))
>  		ret = mfd_add_devices(ab8500->dev, 0, ab9540_devs,
>  				ARRAY_SIZE(ab9540_devs), NULL,
> diff --git a/drivers/mfd/ab8500-debugfs.c b/drivers/mfd/ab8500-debugfs.c
> index b88bbbc..37b7ce4 100644
> --- a/drivers/mfd/ab8500-debugfs.c
> +++ b/drivers/mfd/ab8500-debugfs.c
> @@ -91,12 +91,10 @@
>  #include <linux/ctype.h>
>  #endif
>  
> -/* TODO: this file should not reference IRQ_DB8500_AB8500! */
> -#include <mach/irqs.h>
> -
>  static u32 debug_bank;
>  static u32 debug_address;
>  
> +static int irq_ab8500;
>  static int irq_first;
>  static int irq_last;
>  static u32 *irq_count;
> @@ -1589,7 +1587,7 @@ void ab8500_debug_register_interrupt(int line)
>  {
>  	if (line < num_interrupt_lines) {
>  		num_interrupts[line]++;
> -		if (suspend_test_wake_cause_interrupt_is_mine(IRQ_DB8500_AB8500))
> +		if (suspend_test_wake_cause_interrupt_is_mine(irq_ab8500))
>  			num_wake_interrupts[line]++;
>  	}
>  }
> @@ -2941,6 +2939,7 @@ static int ab8500_debug_probe(struct platform_device *plf)
>  	struct dentry *file;
>  	int ret = -ENOMEM;
>  	struct ab8500 *ab8500;
> +	struct resource *res;
>  	debug_bank = AB8500_MISC;
>  	debug_address = AB8500_REV_REG & 0x00FF;
>  
> @@ -2959,6 +2958,15 @@ static int ab8500_debug_probe(struct platform_device *plf)
>  	if (!event_name)
>  		goto out_freedev_attr;
>  
> +	res = platform_get_resource_byname(plf, 0, "IRQ_AB8500");
> +	if (!res) {
> +		dev_err(&plf->dev, "AB8500 irq not found, err %d\n",
> +			irq_first);
> +		ret = -ENXIO;
> +		goto out_freeevent_name;
> +	}
> +	irq_ab8500 = res->start;
> +
>  	irq_first = platform_get_irq_byname(plf, "IRQ_FIRST");
>  	if (irq_first < 0) {
>  		dev_err(&plf->dev, "First irq not found, err %d\n",

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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