linux-kernel - Re: [PATCH v2 1/5] genirq: introduce irq_domain_translate

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Date:   Wed, 20 Nov 2019 10:38:59 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Yash Shah <yash.shah@...ive.com>
Cc:     <linus.walleij@...aro.org>, <bgolaszewski@...libre.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>, <palmer@...belt.com>,
        "Paul Walmsley ( Sifive)" <paul.walmsley@...ive.com>,
        <aou@...s.berkeley.edu>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <bmeng.cn@...il.com>,
        <atish.patra@....com>, Sagar Kadam <sagar.kadam@...ive.com>,
        <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Sachin Ghadi <sachin.ghadi@...ive.com>
Subject: Re: [PATCH v2 1/5] genirq: introduce irq_domain_translate_onecell

On 2019-11-20 06:59, Yash Shah wrote:
> Add a new function irq_domain_translate_onecell() that is to be used 
> as
> the translate function in struct irq_domain_ops for the v2 IRQ API.
>
> Signed-off-by: Yash Shah <yash.shah@...ive.com>
> ---
>  include/linux/irqdomain.h |  5 +++++
>  kernel/irq/irqdomain.c    | 20 ++++++++++++++++++++
>  2 files changed, 25 insertions(+)
>
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index 583e7ab..cad9eb8 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -426,6 +426,11 @@ int irq_domain_translate_twocell(struct 
> irq_domain *d,
>  				 unsigned long *out_hwirq,
>  				 unsigned int *out_type);
>
> +int irq_domain_translate_onecell(struct irq_domain *d,
> +				 struct irq_fwspec *fwspec,
> +				 unsigned long *out_hwirq,
> +				 unsigned int *out_type);
> +
>  /* IPI functions */
>  int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask 
> *dest);
>  int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 132672b..6972a48 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -987,6 +987,26 @@ const struct irq_domain_ops 
> irq_domain_simple_ops = {
>  EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
>
>  /**
> + * irq_domain_translate_onecell() - Generic translate for direct one 
> cell
> + * bindings
> + *
> + * Device Tree IRQ specifier translation function which works with 
> one cell

nit: the whole point of the 'new' translate function is that they are
firmware-agnostic. Just drop the DT reference here.

> + * bindings where the cell values map directly to the hwirq number.
> + */
> +int irq_domain_translate_onecell(struct irq_domain *d,
> +				 struct irq_fwspec *fwspec,
> +				 unsigned long *out_hwirq,
> +				 unsigned int *out_type)
> +{
> +	if (WARN_ON(fwspec->param_count < 1))
> +		return -EINVAL;
> +	*out_hwirq = fwspec->param[0];
> +	*out_type = IRQ_TYPE_NONE;
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
> +
> +/**
>   * irq_domain_translate_twocell() - Generic translate for direct two 
> cell
>   * bindings
>   *

Can you please also update (potentially in a separate patch) the 
potential
users of this? I mentioned the nvic driver last time...

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...