linux-kernel - Re: [PATCH v4 09/14] irqchip: Provide platform_device to of_irq_init_cb

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Date:   Tue, 19 Oct 2021 14:52:53 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "moderated list:ARM SUB-ARCHITECTURES" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 09/14] irqchip: Provide platform_device to
 of_irq_init_cb_t

On 10/19/21 2:43 PM, Marc Zyngier wrote:
> On Sat, 09 Oct 2021 03:20:18 +0100,
> Florian Fainelli <f.fainelli@...il.com> wrote:
>>
>> Provide the platform device mapping to the interrupt controller node to
>> the of_irq_init_cb_t callback such that drivers can make use of it.
>>
>> Reviewed-by: Rob Herring <robh@...nel.org>
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>> ---
>>  drivers/irqchip/irqchip.c  | 2 +-
>>  drivers/irqchip/qcom-pdc.c | 3 ++-
>>  drivers/of/irq.c           | 2 +-
>>  include/linux/of_irq.h     | 5 ++++-
>>  4 files changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c
>> index 3570f0a588c4..289784eefd00 100644
>> --- a/drivers/irqchip/irqchip.c
>> +++ b/drivers/irqchip/irqchip.c
>> @@ -55,6 +55,6 @@ int platform_irqchip_probe(struct platform_device *pdev)
>>  	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY))
>>  		return -EPROBE_DEFER;
>>  
>> -	return irq_init_cb(np, par_np);
>> +	return irq_init_cb(np, par_np, pdev);
>>  }
>>  EXPORT_SYMBOL_GPL(platform_irqchip_probe);
>> diff --git a/drivers/irqchip/qcom-pdc.c b/drivers/irqchip/qcom-pdc.c
>> index 173e6520e06e..819a93360b96 100644
>> --- a/drivers/irqchip/qcom-pdc.c
>> +++ b/drivers/irqchip/qcom-pdc.c
>> @@ -359,7 +359,8 @@ static int pdc_setup_pin_mapping(struct device_node *np)
>>  	return 0;
>>  }
>>  
>> -static int qcom_pdc_init(struct device_node *node, struct device_node *parent)
>> +static int qcom_pdc_init(struct device_node *node, struct device_node *parent,
>> +			 struct platform_device *pdev)
>>  {
>>  	struct irq_domain *parent_domain, *pdc_domain, *pdc_gpio_domain;
>>  	int ret;
>> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
>> index 352e14b007e7..18f3f5c00c87 100644
>> --- a/drivers/of/irq.c
>> +++ b/drivers/of/irq.c
>> @@ -538,7 +538,7 @@ void __init of_irq_init(const struct of_device_id *matches)
>>  				 desc->dev,
>>  				 desc->dev, desc->interrupt_parent);
>>  			ret = desc->irq_init_cb(desc->dev,
>> -						desc->interrupt_parent);
>> +						desc->interrupt_parent, NULL);
>>  			if (ret) {
>>  				of_node_clear_flag(desc->dev, OF_POPULATED);
>>  				kfree(desc);
>> diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
>> index aaf219bd0354..89acc8b089f0 100644
>> --- a/include/linux/of_irq.h
>> +++ b/include/linux/of_irq.h
>> @@ -9,7 +9,10 @@
>>  #include <linux/ioport.h>
>>  #include <linux/of.h>
>>  
>> -typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *);
>> +struct platform_device;
>> +
>> +typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *,
>> +				struct platform_device *);
> 
> Having added some type-checking to the IRQCHIP_MATCH() #definery, I
> end-up with warnings such as:
> 
> In file included from ./include/linux/kernel.h:16,
>                  from drivers/irqchip/irq-bcm7038-l1.c:12:
> ./include/linux/minmax.h:20:28: warning: comparison of distinct pointer types lacks a cast
>    20 |  (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
>       |                            ^~
> ./include/linux/irqchip.h:41:2: note: in expansion of macro ‘__typecheck’
>    41 |  __typecheck(typecheck_irq_init_cb, fn) ? fn : fn
>       |  ^~~~~~~~~~~
> ./include/linux/irqchip.h:44:12: note: in expansion of macro ‘typecheck_irq_init_cb’
>    44 |    .data = typecheck_irq_init_cb(fn), },
>       |            ^~~~~~~~~~~~~~~~~~~~~
> drivers/irqchip/irq-bcm7038-l1.c:459:1: note: in expansion of macro ‘IRQCHIP_MATCH’
>   459 | IRQCHIP_MATCH("brcm,bcm7038-l1-intc", bcm7038_l1_of_init)
>       | ^~~~~~~~~~~~~
> 
> Clearly, you didn't update the drivers you just converted to
> IRQCHIP_MATCH(), and only fixed the QC driver.

Yes, I will re-order the patches a little bit and update the drivers as
they are converted.

> 
> FWIW, I'm planning to take something like the hack below into the tree
> to detect this sort of stuff early.

Sounds good, thanks!
-- 
Florian