Re: [PATCH 2/4] thermal: rockchip: ensure the otp state before resetting the controller

[Caesar Wang]

Doug,

å 2015å10æ20æ 23:52, Doug Anderson åé:
> Caesar,
>
> On Tue, Oct 20, 2015 at 2:11 AM, Caesar Wang <wxt@xxxxxxxxxxxxxx> wrote:
> > We need the OTP pin is gpio state before resetting the TSADC controller,
> > since the tshut polarity will generate a high signal.
> >
> > Says:
> > The TSHUT temperature is setting more than 80 degree, the default tshut
> > polarity is high.
> >
> > If T > 80C, the OTP output the High Signal.
> > If T < 80C, the OTP output the Low Signal.
> >
> > On the moment, the TSADC controller is reset, the tshut polarity will be
> > low in a short period of time.
> > So:
> >
> > If T < 80C, the OTP output the High Signal.
> > If T > 80C, the OTP output the Low Signal.
> >
> > In some cases, the OTP pin is connected to the PMIC, maybe the PMIC can
> > accept the reset response time to avoid this issue.
> > In other words, the system will be always reboot if we make the OTP pin
> > is connected the others IC to control the power.
> >
> > Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
> > ---
> >
> >   drivers/thermal/rockchip_thermal.c | 32 ++++++++++++++++++++++++++++++++
> >   1 file changed, 32 insertions(+)
> I think you could do this with no code changes to the thermal driver
> if we simply convince Linus W. to apply a change that I posted up just
> about a year ago.  See:
>
> https://patchwork.kernel.org/patch/5055741/
>
> In v1 of that patch at <https://patchwork.kernel.org/patch/5049041/>
> Linus said he liked it "A lot" and was willing to merge it with Greg
> KH's Ack and with a small comment fix.  I obtained the Ack and fixed
> the comment, but then the patch didn't end up being needed for me and
> so I never bumped it and it got lost...
>
> Maybe you could re-test that patch?  It looks like it has a merge
> conflict with current linuxnext but it looks trivial to resolve.  You
> could re-post my patch or I could repost it and you could add your
> Tested-by.
>
> You'd still want to have a bindings change to describe "init", but at
> least you shouldn't need any code changes.

Okay, https://patchwork.kernel.org/patch/5055741/ that's working for me.
Fell free add my  test tag if you resend the patch. (Tested-by: Caesar 
Wang <wxt@xxxxxxxxxxxxxx>)


1634ed8 FROMLIST: drivers/pinctrl: Add the concept of an "init" state
15158f8 FROMLIST: ARM: dts: rockchip: Add the OTP gpio pinctrl
e7d3b88 FROMLIST: thermal: rockchip: change the TSHUT default state
184b154 FROMLIST: thermal: rockchip: ensure the otp state before 
resetting the controller
9edbe15 FROMLIST: dt-bindings: Sync the dts to this document

Meanwhile, I change the dts as follows.

-               pinctrl-names = "default", "otp_out";
+               pinctrl-names = "init", "default";
                pinctrl-0 = <&otp_gpio>;
                pinctrl-1 = <&otp_out>;

> -Doug
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-rockchip


--
Thanks,
Caesar

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/