linux-kernel - Re: [PATCH 0/4] Add the OTP gpio pinctrl to fix the TSHUT issue

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Date:	Tue, 20 Oct 2015 17:15:11 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Eduardo Valentin <edubezval@...il.com>,
	Heiko Stuebner <heiko@...ech.de>
Cc:	Caesar Wang <wxt@...k-chips.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	dianders@...omium.org, devicetree@...r.kernel.org,
	linux-pm@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-rockchip@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	Pawel Moll <pawel.moll@....com>,
	Zhang Rui <rui.zhang@...el.com>,
	Mark Rutland <mark.rutland@....com>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH 0/4] Add the OTP gpio pinctrl to fix the TSHUT issue

The subject is deleted by my finger.

在 2015年10月20日 17:11, Caesar Wang 写道:
> 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.
>
> Tested on box board.
>
>
>
> Caesar Wang (4):
>    dt-bindings: Sync the dts to this document
>    thermal: rockchip: ensure the otp state before resetting the
>      controller
>    thermal: rockchip: change the TSHUT default state
>    ARM: dts: rockchip: Add the OTP gpio pinctrl
>
>   .../bindings/thermal/rockchip-thermal.txt          |  5 ++--
>   arch/arm/boot/dts/rk3288.dtsi                      |  9 ++++--
>   drivers/thermal/rockchip_thermal.c                 | 34 +++++++++++++++++++++-
>   3 files changed, 43 insertions(+), 5 deletions(-)
>

-- 
Thanks,
Caesar

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