linux-kernel - Re: [PATCH 2/4] fsl_pmc: Add API to enable device as wakeup event source

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Date:	Tue, 14 Aug 2012 18:01:41 +0800
From:	Zhao Chenhui <chenhui.zhao@...escale.com>
To:	Tabi Timur-B04825 <B04825@...escale.com>
CC:	Zhao Chenhui-B35336 <B35336@...escale.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"galak@...nel.crashing.org" <galak@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Yang-R58472 <r58472@...escale.com>, <leoli@...escale.com>
Subject: Re: [PATCH 2/4] fsl_pmc: Add API to enable device as wakeup event
 source

On Sat, Aug 11, 2012 at 08:19:43AM -0500, Tabi Timur-B04825 wrote:
> On Tue, Aug 7, 2012 at 3:43 AM, Zhao Chenhui <chenhui.zhao@...escale.com> wrote:
> 
> > +int mpc85xx_pmc_set_wake(struct device *dev, bool enable)
> > +{
> > +       int ret = 0;
> > +       struct device_node *clk_np;
> > +       const u32 *prop;
> > +       u32 pmcdr_mask;
> > +
> > +       if (!pmc_regs) {
> > +               pr_err("%s: PMC is unavailable\n", __func__);
> 
> You have a 'struct device', so please use dev_err instead.
> 
> > +               return -ENODEV;
> > +       }
> > +
> > +       if (enable && !device_may_wakeup(dev))
> > +               return -EINVAL;
> > +
> > +       clk_np = of_parse_phandle(dev->of_node, "fsl,pmc-handle", 0);
> > +       if (!clk_np)
> > +               return -EINVAL;
> > +
> > +       prop = of_get_property(clk_np, "fsl,pmcdr-mask", NULL);
> > +       if (!prop) {
> > +               ret = -EINVAL;
> > +               goto out;
> > +       }
> > +       pmcdr_mask = be32_to_cpup(prop);
> > +
> > +       if (enable)
> > +               /* clear to enable clock in low power mode */
> > +               clrbits32(&pmc_regs->pmcdr, pmcdr_mask);
> > +       else
> > +               setbits32(&pmc_regs->pmcdr, pmcdr_mask);
> > +
> > +out:
> > +       of_node_put(clk_np);
> > +       return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(mpc85xx_pmc_set_wake);
> 
> Use EXPORT_SYMBOL, not EXPORT_SYMBOL_GPL.
> 
> > +
> > +/**
> > + * mpc85xx_pmc_set_lossless_ethernet - enable lossless ethernet
> > + * in (deep) sleep mode
> > + * @enable: True to enable event generation; false to disable
> > + */
> > +void mpc85xx_pmc_set_lossless_ethernet(int enable)
> 
> Should this be 'bool enable'?
> 
> > @@ -21,6 +22,17 @@ struct device_node;
> >
> >  extern void fsl_rstcr_restart(char *cmd);
> >
> > +#ifdef CONFIG_FSL_PMC
> > +extern int mpc85xx_pmc_set_wake(struct device *dev, bool enable);
> > +extern void mpc85xx_pmc_set_lossless_ethernet(int enable);
> 
> Don't use 'extern' for functions.
> 

Why? I think there is no difference.

-Chenhui

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