On Tue, 28 Mar 2017, Sebastian Reichel wrote:
> 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.
In which case may I suggest that you rename the variable, since 'base'
is commonly used in the kernel to mean base of a particular IP's
memory block.
> > 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
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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