linux-kernel - Re: [PATCH 2/4] soc: Mediatek: Add SCPSYS power domain driver

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Date:	Tue, 10 Mar 2015 15:40:53 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Kevin Hilman <khilman@...nel.org>
Cc:	devicetree@...r.kernel.org, James Liao <jamesjj.liao@...iatek.com>,
	linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	kernel@...gutronix.de, Matthias Brugger <matthias.bgg@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] soc: Mediatek: Add SCPSYS power domain driver

On Tue, Mar 10, 2015 at 10:41:42AM +0100, Sascha Hauer wrote:
> > > +	if (data->bus_prot_mask) {
> > > +		u32 mask = data->bus_prot_mask;
> > > +		struct regmap *infracfg = scp->infracfg;
> > > +
> > > +		regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0);
> > > +
> > > +		expired = jiffies + HZ;
> > > +
> > > +		while (1) {
> > > +			u32 val;
> > > +
> > > +			ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
> > > +			if (ret)
> > > +				return ret;
> > > +
> > > +			if (!(val & mask))
> > > +				break;
> > > +
> > > +			cpu_relax();
> > > +			if (time_after(jiffies, expired))
> > > +				return -EIO;
> > > +		}
> > > +	}
> > 
> > This whole "Clear bus protection bits" part seems like it should be an
> > API in the infracfg driver.
> 
> Ok, can do.

Since the infracfg driver (which is really a clk driver) currently is
pending for inclusion I don't want to add more patches to it. I decided
to drop the protection bits for now and come back to this once the
infracfg driver is merged.

Sascha


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