Re: [RFC] irqchip: add support for LS1021A external interrupt lines

[Alexander Stein <alexander.stein@systec-electronic.com>]

On Monday, December 11, 2017, 10:45:09 AM CET Alexander Stein wrote:
> On Monday, December 11, 2017, 10:08:20 AM CET Rasmus Villemoes wrote:
> > >>> +static int
> > >>> +ls1021a_extirq_set_type(struct irq_data *data, unsigned int type)
> > >>> +{
> > >>> +	irq_hw_number_t hwirq = data->hwirq;
> > >>> +	struct extirq_chip_data *chip_data = data->chip_data;
> > >>> +	u32 value, mask;
> > >>> +	int ret;
> > >>> +
> > >>> +	mask = 1U << (31 - hwirq);
> > >>
> > >> Is this really correct? IRQ0 is still at bit position 0. Don't be mislead
> > >> by the left most position in the register layout. This is just strange way
> > >> to express bit-endian access.
> > 
> > Yes, I'm sure. The 26 unused bits in the INTPCR register are marked as
> > reserved with a POR value of 0. Fortunately, they can still be set and
> > read back, and when I did 1U << hwirq it was some of those bits that got
> > set (the POR value of the six used bits are all 1, so the hardware still
> > worked on my board because all the lines happen to be of negative polarity).
> 
> Which functions do reg_read and reg_write in chip_data->syscon->bus_context
> actually point to?
> bus_context is actually a struct regmap_mmio_context *.

Oh, and what is the content of register SCFG_SCFGREVCR?

Alexander