linux-kernel - Re: [PATCH v4 15/16] clk: shmobile: mstp: Consider "zb

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Message-ID: <20150917085314.GA29509@verge.net.au>
Date:	Thu, 17 Sep 2015 17:53:14 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 15/16] clk: shmobile: mstp: Consider "zb_clk" suitable
 for power management

On Thu, Sep 17, 2015 at 05:45:18PM +0900, Simon Horman wrote:
> Hi Mike, Hi Stephen,
> 
> On Tue, Aug 04, 2015 at 02:28:16PM +0200, Geert Uytterhoeven wrote:
> > Currently the CPG/MSTP Clock Domain code looks for MSTP clocks to power
> > manage a device.
> > 
> > Unfortunately, on R-Mobile APE6 (r8a73a4) and SH-Mobile AG5 (sh73a0),
> > the Bus State Controller (BSC) is not power-managed by an MSTP clock,
> > but by a plain CPG clock (zb_clk).  Add a special case to handle this,
> > so the clock is properly managed, and devices connected to the BSC work
> > as expected.
> > 
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> 
> for one reason or another I seem to have this patch queued up in
> my renesas tree for v4.4, without any Acks.
> 
> I think it would be best if one of you took the patch instead.
> Though I'm also happy to take it with Acks.
> 
> Let me know how you would like to proceed.

Sorry to revise the above, I should have checked more closely
before I sent my previous email. I now see that I have an SoC patch
that depends on this one. So if possible I'd like to take this one
through my tree with an Ack or two.

Thanks in advance!

> > ---
> > v4:
> >   - Add Reviewed-by,
> > 
> > v3:
> >   - Use "CPG/MSTP Clock Domain" instead of "CPG Clock Domain",
> > 
> > v2:
> >   - New.
> > ---
> >  drivers/clk/shmobile/clk-mstp.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/clk/shmobile/clk-mstp.c b/drivers/clk/shmobile/clk-mstp.c
> > index b1df7b2f1e970adb..a117c3f0f257b5e1 100644
> > --- a/drivers/clk/shmobile/clk-mstp.c
> > +++ b/drivers/clk/shmobile/clk-mstp.c
> > @@ -259,6 +259,10 @@ int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev)
> >  					    "renesas,cpg-mstp-clocks"))
> >  			goto found;
> >  
> > +		/* BSC on r8a73a4/sh73a0 uses zb_clk instead of an mstp clock*/
> > +		if (!strcmp(clkspec.np->name, "zb_clk"))
> > +			goto found;
> > +
> >  		of_node_put(clkspec.np);
> >  		i++;
> >  	}
> > -- 
> > 1.9.1
> > 
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