linux-kernel - Re: [PATCHv4] mfd: cpcap: implement irq sense helper

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Message-ID: <20170328145415.td4xeqxedem5yjen@earth>
Date:   Tue, 28 Mar 2017 16:54:15 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Tony Lindgren <tony@...mide.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4] mfd: cpcap: implement irq sense helper

Hi Lee,

On Tue, Mar 28, 2017 at 11:27:16AM +0100, Lee Jones wrote:
> > +int cpcap_sense_virq(struct regmap *regmap, int virq)
> > +{
> > +	struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
> > +	int base = regmap_irq_chip_get_base(d);
> 
> What base is this?

This function takes an Linux irq number. That number is a virtual
irq number, which has nothing to do with the hardware. For example
a platform could look like this:

linux irq   device          base   device irq
---------------------------------------------
0-63        SoC             0      0-63
64-127      SoC-GPIO        64     0-63
128-191     CPCAP           128    0-63

For the above example the function would map 128-191 to 0-63 as
used by the device.

> Could it be used to avoid some calculations in cpcap_sense_irq()?

No.

> > +	return cpcap_sense_irq(regmap, virq - base);
> > +}
> > +EXPORT_SYMBOL_GPL(cpcap_sense_virq);

-- Sebastian

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