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SubjectRe: [PATCH v5 4/5] fsl_pmc: Add API to enable device as wakeup event source
On Fri, Jun 01, 2012 at 05:08:52PM -0500, Scott Wood wrote:
> On 05/11/2012 06:53 AM, Zhao Chenhui wrote:
> > Add APIs for setting wakeup source and lossless Ethernet in low power modes.
> > These APIs can be used by wake-on-packet feature.
> >
> > Signed-off-by: Dave Liu <daveliu@freescale.com>
> > Signed-off-by: Li Yang <leoli@freescale.com>
> > Signed-off-by: Jin Qing <b24347@freescale.com>
> > Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
> > ---
> > arch/powerpc/sysdev/fsl_pmc.c | 71 ++++++++++++++++++++++++++++++++++++++++-
> > arch/powerpc/sysdev/fsl_soc.h | 9 +++++
> > 2 files changed, 79 insertions(+), 1 deletions(-)
> >
> > diff --git a/arch/powerpc/sysdev/fsl_pmc.c b/arch/powerpc/sysdev/fsl_pmc.c
> > index 1dc6e9e..c1170f7 100644
> > --- a/arch/powerpc/sysdev/fsl_pmc.c
> > +++ b/arch/powerpc/sysdev/fsl_pmc.c
> > @@ -34,6 +34,7 @@ struct pmc_regs {
> > __be32 powmgtcsr;
> > #define POWMGTCSR_SLP 0x00020000
> > #define POWMGTCSR_DPSLP 0x00100000
> > +#define POWMGTCSR_LOSSLESS 0x00400000
> > __be32 res3[2];
> > __be32 pmcdr;
> > };
> > @@ -43,6 +44,74 @@ static unsigned int pmc_flag;
> >
> > #define PMC_SLEEP 0x1
> > #define PMC_DEEP_SLEEP 0x2
> > +#define PMC_LOSSLESS 0x4
> > +
> > +/**
> > + * mpc85xx_pmc_set_wake - enable devices as wakeup event source
> > + * @pdev: platform device affected
> > + * @enable: True to enable event generation; false to disable
> > + *
> > + * This enables the device as a wakeup event source, or disables it.
> > + *
> > + * RETURN VALUE:
> > + * 0 is returned on success
> > + * -EINVAL is returned if device is not supposed to wake up the system
> > + * Error code depending on the platform is returned if both the platform and
> > + * the native mechanism fail to enable the generation of wake-up events
> > + */
> > +int mpc85xx_pmc_set_wake(struct platform_device *pdev, bool enable)
>
> Why does it have to be a platform_device? Would a bare device_node work
> here? If it's for stuff like device_may_wakeup() that could be in a
> platform_device wrapper function.

It does not have to be a platform_device. I think it can be a struct device.

>
> Where does this get called from? I don't see an example user in this
> patchset.

It will be used by a gianfar related patch. I plan to submit that patch
after these patches accepted.

>
> > +{
> > + int ret = 0;
> > + struct device_node *clk_np;
> > + u32 *prop;
> > + u32 pmcdr_mask;
> > +
> > + if (!pmc_regs) {
> > + pr_err("%s: PMC is unavailable\n", __func__);
> > + return -ENODEV;
> > + }
> > +
> > + if (enable && !device_may_wakeup(&pdev->dev))
> > + return -EINVAL;
>
> Who is setting can_wakeup for these devices?

The device driver is responsible to set can_wakeup.

>
> > + clk_np = of_parse_phandle(pdev->dev.of_node, "fsl,pmc-handle", 0);
> > + if (!clk_np)
> > + return -EINVAL;
> > +
> > + prop = (u32 *)of_get_property(clk_np, "fsl,pmcdr-mask", NULL);
>
> Don't cast the const away.

OK.

>
> > + 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);
>
> What is the default PMCDR if this function is never called? Should init
> to all bits set on PM driver probe (or maybe limit it to defined bits
> only, though that's a little harder to do generically).
>
> -Scot

The default PMCDR is defined separately by individual chip.
I agree with you. I will have a try.

-Chenhui



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