linux-kernel - Re: [PATCH 3/4] thermal: rockchip: change the TSHUT default state

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Date:	Tue, 20 Oct 2015 19:14:29 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Caesar Wang <caesar.upstream@...il.com>
Cc:	Caesar Wang <wxt@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
	"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>,
	Zhang Rui <rui.zhang@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/4] thermal: rockchip: change the TSHUT default state

Caesar,

On Tue, Oct 20, 2015 at 6:47 PM, Caesar Wang <caesar.upstream@...il.com> wrote:
> Doug,
>
> 在 2015年10月21日 00:01, Doug Anderson 写道:
>
> Caesar,
>
> On Tue, Oct 20, 2015 at 2:11 AM, Caesar Wang <wxt@...k-chips.com> wrote:
>
> As the TRM says, the TSHUT default state is high active.
> In general, the TSHUT state can get from the dts. Otherwise
> it gets the state from this.
>
> Can you point at where the TRM says that the default state is high active?
>
> With the manual I have, I look at TSADC_AUTO_CON and I look at the
> description of "Bit 8".  It says that "tshut polarity" is 0 for low
> active and 1 for high active.  It then said that the Reset Value is 0.
>
> ...the "Reset Value" in tables like this is notoriously unreliable, so
> I can totally believe that it's wrong.  If you can point me at the
> part of the TRM that says that TSHUT is high active by default then I
> can confirm that for you.  ;)
>
>
> Okay, I know that's my wrong, the polarity is high or low can be selected.
> :-(
>
> I remember the veyron why is the default HiGH active, since the opt is
> connected to the PMIC.(we need think about the devices)
>
> Why is the evb board LOW active, since the opt didn't connected to the
> devices. TSHUT is depend on the CRU to work.

I think we can drop this patch then, right?  Any boards that need a
change from the default can just set "rockchip,hw-tshut-polarity",
right?

-Doug
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