linux-kernel - Re: [PATCH v3 2/9] irqdomain: add bus token DOMAIN_BUS

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Message-ID: <0c4ae5f1-9589-2262-325a-34cba324fbfa@arm.com>
Date:   Mon, 11 Mar 2019 10:07:14 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Lina Iyer <ilina@...eaurora.org>, swboyd@...omium.org,
        evgreen@...omium.org
Cc:     linux-kernel@...r.kernel.org, rplsssn@...eaurora.org,
        linux-arm-msm@...r.kernel.org, thierry.reding@...il.com,
        bjorn.andersson@...aro.org, dianders@...omium.org,
        linus.walleij@...aro.org
Subject: Re: [PATCH v3 2/9] irqdomain: add bus token DOMAIN_BUS_WAKEUP

On 22/02/2019 22:18, Lina Iyer wrote:
> Add new bus token to describe domains that are wakeup capable.

This doesn't quite match what this bus token is trying to describe. How
about something along the lines of the following:

A single controller can handle normal interrupts and wake-up interrupts
independently, with a different numbering space. It is thus crucial to
allow the driver for such a controller discriminate between the two.

A simple way to do so is to tag the wake-up irqdomain with a "bus token"
that indicates the wake-up domain. This slightly abuses the notion of
bus, but also radically simplifies the design of such a driver. Between
two evils, we choose the least damaging.

> 
> Suggested-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
> ---
>  include/linux/irqdomain.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index 35965f41d7be..05055bc992ab 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -82,6 +82,7 @@ enum irq_domain_bus_token {
>  	DOMAIN_BUS_NEXUS,
>  	DOMAIN_BUS_IPI,
>  	DOMAIN_BUS_FSL_MC_MSI,
> +	DOMAIN_BUS_WAKEUP,
>  };
>  
>  /**
> 

Thanks,

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