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SubjectRe: [PATCH 7/7] common.c:105 Variable 'gephy' is never used.
On Fri, Mar 13, 2015 at 03:48:40PM +0100, Andrew Lunn wrote:
> On Fri, Mar 13, 2015 at 02:19:26PM +0000, Russell King - ARM Linux wrote:
> > On Fri, Mar 13, 2015 at 03:44:24PM +0200, Ameen Ali wrote:
> > > Variable 'gephy' is assigned a value that is never used.
> > >
> > > Signed-off-by : <AmeenALi023@gmail.com>
> > > ---
> > > arch/arm/mach-dove/common.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/arch/arm/mach-dove/common.c b/arch/arm/mach-dove/common.c
> > > index 0d1a892..115a413 100644
> > > --- a/arch/arm/mach-dove/common.c
> > > +++ b/arch/arm/mach-dove/common.c
> > > @@ -113,7 +113,7 @@ static void __init dove_clk_init(void)
> > > orion_clkdev_add(NULL, "orion_spi.1", tclk);
> > > orion_clkdev_add(NULL, "orion_wdt", tclk);
> > > orion_clkdev_add(NULL, "mv64xxx_i2c.0", tclk);
> > > -
> > > + orion_clkdev_add(NULL,"mv643xx_eth_port.0",gephy);
> >
> > NAK. Just because some variable isn't read doesn't mean that you need
> > to dream up some way to make it used.
> >
> > In any case, this is wrong because it will duplicate this entry:
> >
> > > orion_clkdev_add(NULL, "mv643xx_eth_port.0", ge);
>
> Hi Russell
>
> Missed that. Sorry.
>
> What happens in the DT world is that ge clock is a child of the gephy
> clock, so that when you enable the ge clock, it walks up towards the
> parent and enables the gephy clock.
>
> I don't see anything like this in the legacy Dove world. Are you just
> relying on the bootloader turning on the phy and nothing turning it
> off?

See, this is why I hate these trivial patches - they waste people's time
and create a load of unnecessary confusion where there's absolutely none
needed.

Here's the legacy code:

gephy = dove_register_gate("gephy", "tclk", CLOCK_GATING_BIT_GIGA_PHY);

Here, we have a gate controlled by the CLOCK_GATING_BIT_GIGA_PHY bit
between the tclk, and gephy clock. This is immediately followed by:

ge = dove_register_gate("ge", "gephy", CLOCK_GATING_BIT_GBE);

which is a gate controlled by the CLOCK_GATING_BIT_GBE bit between the
gephy clock and the ge clock. This second clock is then registered for
use by the ethernet device:

orion_clkdev_add(NULL, "mv643xx_eth_port.0", ge);

If we look at clk_summary, we see:

tclk 12 12 166666667 0 0
gephy 1 1 166666667 0 0
ge 1 1 166666667 0 0

which is the same relationship as in DT:

tclk 13 13 166666667 0 0
gephy 1 1 166666667 0 0
ge 2 2 166666667 0 0

There is no problem here; this has been a complete waste of our time
while we discuss this non-problem.

--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.


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