linux-kernel - RE: [PATCH 1/1] irqchip: stm32-exti: add domain translate function

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Date:   Fri, 11 Jan 2019 17:34:32 +0000
From:   Loic PALLARDY <loic.pallardy@...com>
To:     Marc Zyngier <marc.zyngier@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 1/1] irqchip: stm32-exti: add domain translate function

Hi Marc,
Thanks for the review

> -----Original Message-----
> From: Marc Zyngier <marc.zyngier@....com>
> Sent: vendredi 11 janvier 2019 16:52
> To: Loic PALLARDY <loic.pallardy@...com>; tglx@...utronix.de;
> jason@...edaemon.net; mcoquelin.stm32@...il.com; Alexandre TORGUE
> <alexandre.torgue@...com>
> Cc: linux-kernel@...r.kernel.org; linux-stm32@...md-
> mailman.stormreply.com; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH 1/1] irqchip: stm32-exti: add domain translate function
> 
> On 11/01/2019 13:58, Loic Pallardy wrote:
> > Domain translate function is needed to recover irq
> > configuration parameters from DT node
> >
> > Signed-off-by: Loic Pallardy <loic.pallardy@...com>
> 
> Surely this fixes something, right? Can you please add a Fixes: tag?
Yes I will add tag of patch introducing hierarchical domain

> 
> > ---
> >  drivers/irqchip/irq-stm32-exti.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-
> exti.c
> > index 6edfd4bfa169..717879028cc4 100644
> > --- a/drivers/irqchip/irq-stm32-exti.c
> > +++ b/drivers/irqchip/irq-stm32-exti.c
> > @@ -819,9 +819,27 @@ static int __init stm32_exti_init(const struct
> stm32_exti_drv_data *drv_data,
> >  	return ret;
> >  }
> >
> > +static int stm32_exti_h_translate(struct irq_domain *d,
> > +				  struct irq_fwspec *fwspec,
> > +				  unsigned long *out_hwirq,
> > +				  unsigned int *out_type)
> > +{
> > +	if (is_of_node(fwspec->fwnode)) {
> 
> Is there any case where this wouldn't be true? i.e. an stm32 ACPI system?

You're right, no ACPI so check useless

> 
> > +		if (fwspec->param_count != 2)
> > +			return -EINVAL;
> > +
> > +		*out_hwirq = fwspec->param[0];
> > +		*out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
> > +		return 0;
> > +	}
> > +
> > +	return -EINVAL;
> > +}
> 
> Because otherwise, this is exactly what irq_domain_xlate_twocell() does.

Thanks for pointing me this helper. Indeed no need to duplicate code
I'll send a v2 

Regards,
Loic
> 
> > +
> >  static const struct irq_domain_ops stm32_exti_h_domain_ops = {
> >  	.alloc	= stm32_exti_h_domain_alloc,
> >  	.free	= irq_domain_free_irqs_common,
> > +	.translate = stm32_exti_h_translate,
> >  };
> >
> >  static int
> >
> 
> Thanks,
> 
> 	M.
> --
> Jazz is not dead. It just smells funny...