[alsa-devel] [PATCH 1/2] ASoC: tfa9879: New driver for NXP Semiconductors TFA9879 amplifier.

[Mark Brown]

On Thu, Nov 06, 2014 at 02:37:31PM +0000, Peter Rosin wrote:
> Mark Brown wrote:

> > > +	if (tfa9879->lsb_justified)
> > > +		TFA9879_REG(codec, SERIAL_INTERFACE_1, I2S_SET, i2s_set);

> > Why does this need to be reset every time, shouldn't we just be setting the
> > register in set_fmt().?

> Yes, I'd sure like to do that, but how do I get to the width in set_fmt()?

Oh, this has some width related thing in it?

> > > +	{ TFA9879_MISC_STATUS,		0x0000 }, /* 0x15, read-only */
> > > +};

> > > +static bool tfa9879_volatile_register(struct device *dev, unsigned
> > > +int reg) {
> > > +	return reg == TFA9879_MISC_STATUS;

> > If the register is volatile it shouldn't have a default value provided.

> Then I misunderstood what volatile was meant to do. I'll just nuke the
> function. It works fine anyway...

A volatile register is one that the chip may change autonomously (eg, an
interrupt status register).
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