linux-kernel - Re: [PATCH v3 1/5] mfd: rk808: Add RK817 and RK809 support

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Date:   Tue, 23 Oct 2018 07:26:01 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     tony <tony.xie@...k-chips.com>
Cc:     heiko@...ech.de, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, chenjh@...k-chips.com,
        xsf@...k-chips.com, zhangqing@...k-chips.com,
        huangtao@...k-chips.com
Subject: Re: [PATCH v3 1/5] mfd: rk808: Add RK817 and RK809 support

> > >      The rk809 and rk817 are a Power Management IC (PMIC) for multimedia
> > >      and handheld devices. It contains the following components:
> > > 
> > >          - Regulators
> > >          - RTC
> > >          - Clocking
> > > 
> > >      Both RK809 and RK817 chips are using a similar register map,
> > >      so we can reuse the RTC and Clocking and regulators functionality.
> > > 
> > > Signed-off-by: Tony Xie <tony.xie@...k-chips.com>
> > > ---
> > >   drivers/mfd/Kconfig       |   6 +-
> > >   drivers/mfd/rk808.c       | 218 +++++++++++++++++++++++++++++++++++++++++++++-
> > >   include/linux/mfd/rk808.h | 172 ++++++++++++++++++++++++++++++++++++
> > >   kernel/reboot.c           |   1 +
> > >   4 files changed, 391 insertions(+), 6 deletions(-)

[...]

> > > diff --git a/kernel/reboot.c b/kernel/reboot.c
> > > index e4ced88..83810d7 100644
> > > --- a/kernel/reboot.c
> > > +++ b/kernel/reboot.c
> > > @@ -49,6 +49,7 @@
> > >    */
> > >   void (*pm_power_off_prepare)(void);
> > > +EXPORT_SYMBOL_GPL(pm_power_off_prepare);
> > Why do you need this where no other driver in the kernel does?
>     There is a gpio_slp pin for RK809 and RK817，this pin has reset、power
> down and sleep functions，so
>     when system is going to power down, this pin is needed to switch to
> power down function，and then we just only control
>     this pin to high to power down the system in atf at last。

There are other PM call-backs that you can use for this.  There
shouldn't be any requirement to export and call functions at this
level directly.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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