linux-kernel - Re: [PATCH v2 09/10] irqchip: ti-sci-inta: Add support for Interrupt Aggregator driver

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Date:   Mon, 22 Oct 2018 13:42:15 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Lokesh Vutla <lokeshvutla@...com>, Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <marc.zyngier@....com>
CC:     Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Tero Kristo <t-kristo@...com>,
        Sekhar Nori <nsekhar@...com>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [PATCH v2 09/10] irqchip: ti-sci-inta: Add support for Interrupt
 Aggregator driver

Lokesh,

On 2018-10-18 18:40, Lokesh Vutla wrote:
> Texas Instruments' K3 generation SoCs has an IP Interrupt Aggregator
> which is an interrupt controller that does the following:
> - Converts events to interrupts that can be understood by
>   an interrupt router.
> - Allows for multiplexing of events to interrupts.
> - Allows for grouping of multiple events to a single interrupt.
> 
> Configuration of the interrupt aggregator registers can only be done by
> a system co-processor and the driver needs to send a message to this
> co processor over TISCI protocol.
> 
> Add support for Interrupt Aggregator driver over TISCI protocol.

Have you compiled this?

...

> diff --git a/drivers/irqchip/irq-ti-sci-inta.c b/drivers/irqchip/irq-ti-sci-inta.c
> new file mode 100644
> index 000000000000..ef0a2e8b782c
> --- /dev/null
> +++ b/drivers/irqchip/irq-ti-sci-inta.c

...

> +/**
> + * ti_sci_inta_register_event() - Register a event to an interrupt aggregator
> + * @dev:	Device pointer to source generating the event
> + * @src_id:	TISCI device ID of the event source
> + * @src_index:	Event source index within the device.
> + * @virq:	Linux Virtual IRQ number
> + * @flags:	Corresponding IRQ flags
> + * @ack_needed:	If explicit clearing of event is required.
> + *
> + * Creates a new irq and attaches to IA domain if virq is not specified
> + * else attaches the event to vint corresponding to virq.
> + * When using TISCI within the client drivers, source indexes are always
> + * generated dynamically and cannot be represented in DT. So client
> + * drivers should call this API instead of platform_get_irq().
> + *
> + * Return virq if all went well else appropriate error value.
> + */
> +int ti_sci_inta_register_event(struct device *dev, u16 src_id, u16 src_index,
> +			       unsigned int virq, u32 flags, bool ack_needed)
> +{

...

> diff --git a/include/linux/irqchip/irq-ti-sci-inta.h b/include/linux/irqchip/irq-ti-sci-inta.h
> new file mode 100644
> index 000000000000..c078234fda3f
> --- /dev/null
> +++ b/include/linux/irqchip/irq-ti-sci-inta.h
> @@ -0,0 +1,35 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Texas Instruments' System Control Interface (TI-SCI) irqchip
> + *
> + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
> + *	Lokesh Vutla <lokeshvutla@...com>
> + */
> +
> +#ifndef __INCLUDE_LINUX_IRQCHIP_TI_SCI_INTA_H
> +#define __INCLUDE_LINUX_IRQCHIP_TI_SCI_INTA_H
> +
> +#if IS_ENABLED(CONFIG_TI_SCI_INTA_IRQCHIP)
> +int ti_sci_inta_register_event(struct device *dev, u16 src_id, u16 src_index,
> +			       unsigned int virq, u32 flags);

You are missing the ack_needed

> +int ti_sci_inta_unregister_event(struct device *dev, u16 src_id, u16 src_index,
> +				 unsigned int virq);
> +
> +#else /* CONFIG_TI_SCI_INTA_IRQCHIP */
> +
> +static inline int ti_sci_inta_register_event(struct device *dev, u16 src_id,
> +					     u16 src_index, unsigned int virq,
> +					     u32 flags)

Here as well.

> +{
> +	return -EINVAL;
> +}
> +
> +static inline int ti_sci_inta_unregister_event(struct device *dev, u16 src_id,
> +					       u16 src_index, unsigned int virq)
> +{
> +	return -EINVAL;
> +}
> +
> +#endif /* CONFIG_TI_SCI_INTA_IRQCHIP */
> +
> +#endif /* __INCLUDE_LINUX_IRQCHIP_TI_SCI_INTA_H */
> 

- Péter

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