Re: [RFC PATCH v2 08/10] rtc: bd70528: Initial support for ROHM bd70528 RTC

[Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>]

On Mon, Jan 28, 2019 at 01:26:56PM -0700, Jerry Hoemann wrote:
> On Sat, Jan 26, 2019 at 08:30:24AM -0800, Guenter Roeck wrote:
> > On 1/25/19 3:05 AM, Matti Vaittinen wrote:
> > > +static int bd70528_set_wake(struct bd70528 *bd70528,
> > > +			    int enable, int *old_state)
> > > +{
> > > +	int ret;
> > > +	unsigned int ctrl_reg;
> > > +
> > > +	ret = regmap_read(bd70528->chip.regmap, BD70528_REG_WAKE_EN, &ctrl_reg);
> > > +	if (ret)
> > > +		return ret;
> > > +
> > > +	if (old_state) {
> > > +		if (ctrl_reg & BD70528_MASK_WAKE_EN)
> > > +			*old_state |= BD70528_WAKE_STATE_BIT;
> > > +		else
> > > +			*old_state &= ~BD70528_WAKE_STATE_BIT;
> > > +
> > > +		if ((!enable) == (!(*old_state & BD70528_WAKE_STATE_BIT)))
> > > +			return 0;
> > 
> > I think
> > 		if (enable == !!(*old_state & BD70528_WAKE_STATE_BIT))
> > would be much better readable. Even if not, there are way too many ()
> > in the above conditional.
> > 
> 
> The substitution is not equivalent to original.  I think you mean:
> 
>  		if (!!enable == !!(*old_state & BD70528_WAKE_STATE_BIT))

Thanks Jerry! Good catch! I originally wanted that all non-zero values
of 'enable' would be 'true'. So maybe I just use the original approach
but get rid of extra parenthesis which were pointed out by Guenter.

		if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT))
should do it just fine, right?

Br,
	Matti