[PATCH 04/11] soc: imx: gpcv2: wait for ADB400 handshake

[Lucas Stach]

On Mi, 2020-09-30 at 18:11 +0200, Marek Vasut wrote:
> On 9/30/20 5:49 PM, Lucas Stach wrote:
> 
> [...]
> 
> > @@ -176,9 +180,19 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
> >  			   GPC_PGC_CTRL_PCR, 0);
> >  
> >  	/* request the ADB400 to power up */
> > -	if (domain->bits.hsk)
> > +	if (domain->bits.hskreq) {
> >  		regmap_update_bits(domain->regmap, GPC_PU_PWRHSK,
> > -				   domain->bits.hsk, domain->bits.hsk);
> > +				   domain->bits.hskreq, domain->bits.hskreq);
> > +
> > +		ret = regmap_read_poll_timeout(domain->regmap, GPC_PU_PWRHSK,
> > +					       reg_val,
> > +					       (reg_val & domain->bits.hskack),
> > +					       0, USEC_PER_MSEC);
> > +		if (ret) {
> > +			dev_err(domain->dev, "failed to power up ADB400\n");
> 
> The ADB400 is a bus bridge, so the bus is being attached here, not
> powered up, right ?

The bits in the PWRHSK register are called "power down" bits, so I kept
this nomenclature. Also I think the ADB400 is mostly isolating the bus
in the power domains from the rest of the NoC, "attaching" of the bus
is really disabling the isolation.

As there are multiple valid naming choices I kept the naming from the
RM.

Regards,
Lucas