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

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Message-ID: <CAOZdJXXdgS5x2ZkuXb4wHckdqLzSM2xy-eYU3+28d_=JH3euxg@mail.gmail.com>
Date:	Sat, 11 Aug 2012 13:19:43 +0000
From:	Tabi Timur-B04825 <B04825@...escale.com>
To:	Zhao Chenhui-B35336 <B35336@...escale.com>
CC:	"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>
Subject: Re: [PATCH 2/4] fsl_pmc: Add API to enable device as wakeup event
 source

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.

-- 
Timur Tabi
Linux kernel developer at Freescale
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