Message-ID: <56285E2D.2040707@gmail.com>
Date:	Thu, 22 Oct 2015 11:55:25 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Caesar Wang <wxt@...k-chips.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Heiko Stuebner <heiko@...ech.de>,
	Pawel Moll <pawel.moll@....com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Eduardo Valentin <edubezval@...il.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Zhang Rui <rui.zhang@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RESEND PATCH v2 1/2] dt-bindings: rockchip-thermal: Add the
 "init" pinctrl in this document



在 2015年10月22日 11:45, Doug Anderson 写道:
> Caesar,
>
> On Wed, Oct 21, 2015 at 7:30 PM, Caesar Wang <wxt@...k-chips.com> wrote:
>> The "init" pinctrl is defined we'll set
>> pinctrl to this state before probe and then "default" after probe.
>>
>> Add the "init" pinctrl as the OTP gpio state, since we need switch
>> the pin to gpio state before the TSADC controller is reset.
>>
>> As I know, the TSADC controller is reset, the tshut polarity will be
>> a *low* signal in a short period of time for some devices.
>>
>> Says:
>> The TSADC get the temperature on rockchip thermal.
>>
>> If T(current temperature) < (setting temperature), the OTP output the
>> *high* signal.
>> If T(current temperature) > (setting temperature), 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>
>> Reviewed-by: Douglas Anderson <dianders@...omium.org>
>> ---
>>
>> Changes in v2:
>>    - Add the 'init' pinctrl more decription in commit.
>>    - Fix the subject to make more obvious in PATCH[1/2]
>>    - Resend this patch v2 since fix the subject to be specific.
>>
>> Changes in v1:
>>    - As the Doug comments, add the 'init' property to sync document.
>>
>>   Documentation/devicetree/bindings/thermal/rockchip-thermal.txt | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt b/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
>> index ef802de..28e84f7 100644
>> --- a/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
>> +++ b/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
> I think Rob wanted something more in the "rockchip-thermal.txt"
> document itself.  Like:
>
> Pinctrl states:
> - During device probe a driver may glitch the output line.  If this is
> not acceptable for your board, you can use the standard "init" and
> "default" pinctrl states.  The "init" state will be set before device
> probe and "default" after.

Sound resonable.
Thanks Doug to explain!

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


-- 
Thanks,
Caesar

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