linux-kernel - Re: [PATCH 2/2] drivers: irqchip: irq-ti-sci-intr: Allow parsing interrupt-types per-line

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Message-ID: <6342109c-7345-4895-8eba-e5efca0606f5@ti.com>
Date: Mon, 19 Jan 2026 22:35:13 +0530
From: Aniket Limaye <a-limaye@...com>
To: Thomas Gleixner <tglx@...nel.org>, Vignesh Raghavendra <vigneshr@...com>,
	<u-kumar1@...com>, Nishanth Menon <nm@...com>, Tero Kristo
	<kristo@...nel.org>, Santosh Shilimkar <ssantosh@...nel.org>, Rob Herring
	<robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>
CC: <j-mcarthur@...com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2] drivers: irqchip: irq-ti-sci-intr: Allow parsing
 interrupt-types per-line



On 18/01/26 15:19, Thomas Gleixner wrote:
> On Fri, Jan 16 2026 at 18:38, Aniket Limaye wrote:
> 
> The subject line prefix is made up. Please follow the documented
> conventions:
> 
> https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#patch-submission-notes
> 
>> Some INTR router instances act as simple passthroughs that preserve the
>> source interrupt type unchanged at the output line, rather than converting
>> all interrupts to a fixed type.
>>
>> When interrupt sources are not homogeneous with respect to trigger type,
>> the driver needs to read each source's interrupt type from DT and pass it
>> unchanged to its interrupt parent
>>
>> Previously, the interrupt type for all output lines was set globally using
>> the "ti,intr-trigger-type" property (values 1 or 4).
> 
> What means 'previously'?
> 
> You want to describe the current state and not something which might be
> in the past after applying the change.
> 

Sure, makes sense... will update this in v2.

>> Add support for "ti,intr-trigger-type" = 15 (IRQ_TYPE_DEFAULT) to indicate
>> passthrough mode:
>> - When set to 15: Parse interrupt type per-line from DT
>> - When set to 1 or 4: Use global setting (maintains backward compatibility)
> 
>> @@ -156,11 +168,27 @@ static int ti_sci_intr_alloc_parent_irq(struct irq_domain *domain,
>>   		fwspec.param_count = 3;
>>   		fwspec.param[0] = 0;	/* SPI */
>>   		fwspec.param[1] = p_hwirq - 32; /* SPI offset */
>> -		fwspec.param[2] = intr->type;
>> +		fwspec.param[2] = hwirq_type;
>>   	} else {
>>   		/* Parent is Interrupt Router */
>> -		fwspec.param_count = 1;
>> -		fwspec.param[0] = p_hwirq;
>> +		u32 parent_trigger_type;
>> +
>> +		err = of_property_read_u32(parent_node,
>> +					  "ti,intr-trigger-type",
>> +					  &parent_trigger_type);
> 
> You have 100 characters and if you need a line break align the second
> line argument with the first line argument and not with the bracket.
> See documentation.
> 
>> +		if (err)
>> +			goto err_irqs;
>> +
>> +		if (parent_trigger_type != IRQ_TYPE_DEFAULT) {
>> +			/* Parent has global trigger type */
>> +			fwspec.param_count = 1;
>> +			fwspec.param[0] = p_hwirq;
>> +		} else {
>> +			/* Parent supports per-line trigger types */
>> +			fwspec.param_count = 2;
>> +			fwspec.param[0] = p_hwirq;
>> +			fwspec.param[1] = hwirq_type;
>> +		}
>>   	}
>>   
>>   	err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
>> @@ -197,14 +225,14 @@ static int ti_sci_intr_irq_domain_alloc(struct irq_domain *domain,
>>   {
>>   	struct irq_fwspec *fwspec = data;
>>   	unsigned long hwirq;
>> -	unsigned int flags;
>> +	unsigned int hwirq_type;
> 
> https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#variable-declarations
> 
>>   	int err, out_irq;
>>   
>> -	err = ti_sci_intr_irq_domain_translate(domain, fwspec, &hwirq, &flags);
>> +	err = ti_sci_intr_irq_domain_translate(domain, fwspec, &hwirq, &hwirq_type);
>>   	if (err)
>>   		return err;
>>   
>> -	out_irq = ti_sci_intr_alloc_parent_irq(domain, virq, hwirq);
>> +	out_irq = ti_sci_intr_alloc_parent_irq(domain, virq, hwirq, hwirq_type);
>>   	if (out_irq < 0)
>>   		return out_irq;
> 
> Thanks,
> 
>          tglx


Thanks for reviewing the patch.

Will send a v2 addressing all of your feedback and will note all 
recommendations for future patches too.

Regards,
Aniket