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    Subject[PATCH v4 1/6] genirq: introduce irq_domain_translate_onecell
    Date
    Add a new function irq_domain_translate_onecell() that is to be used as
    the translate function in struct irq_domain_ops.

    Signed-off-by: Yash Shah <yash.shah@sifive.com>
    ---
    include/linux/irqdomain.h | 5 +++++
    kernel/irq/irqdomain.c | 17 +++++++++++++++++
    2 files changed, 22 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..cf57d87d 100644
    --- a/kernel/irq/irqdomain.c
    +++ b/kernel/irq/irqdomain.c
    @@ -987,6 +987,23 @@ 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
    + */
    +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
    *
    --
    2.7.4
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