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

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Message-ID: <CAD=FV=WHvwNGdRZ4Yjwk0zB00o2gFHXLfbAYHai1kM_oBAR4_g@mail.gmail.com>
Date:	Tue, 20 Oct 2015 08:52:35 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Zhang Rui <rui.zhang@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 2/4] thermal: rockchip: ensure the otp state before
 resetting the controller

Caesar,

On Tue, Oct 20, 2015 at 2:11 AM, Caesar Wang <wxt@...k-chips.com> 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@...k-chips.com>
> ---
>
>  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.


-Doug
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