Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753372AbaJXBiI (ORCPT ); Thu, 23 Oct 2014 21:38:08 -0400 Received: from mail-pa0-f47.google.com ([209.85.220.47]:34457 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751014AbaJXBiG (ORCPT ); Thu, 23 Oct 2014 21:38:06 -0400 User-Agent: K-9 Mail for Android In-Reply-To: <5449A6A4.3070608@rock-chips.com> References: <1414057207-1576-1-git-send-email-caesar.wang@rock-chips.com> <1414057207-1576-5-git-send-email-caesar.wang@rock-chips.com> <20141024004625.GD9463@dtor-ws> <5449A6A4.3070608@rock-chips.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Subject: Re: [PATCH v13 4/5] ARM: dts: add main Thermal info to rk3288 From: Dmitry Torokhov Date: Thu, 23 Oct 2014 18:37:55 -0700 To: Caesar Wang CC: heiko@sntech.de, rui.zhang@intel.com, edubezval@gmail.com, zyf@rock-chips.com, dianders@chromium.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, cf@rock-chips.com, dbasehore@chromium.org, huangtao@rock-chips.com, cjf@rock-chips.com, zhengsq@rock-chips.com Message-ID: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On October 23, 2014 6:08:52 PM PDT, Caesar Wang wrote: >Dmitry, > >在 2014/10/24 8:46, Dmitry Torokhov 写道: >> Hi Caesar, >> >> On Thu, Oct 23, 2014 at 05:40:06PM +0800, Caesar Wang wrote: >>> This patch is depend on rk3288-thermal.dtsi,or >>> it will compile error. >>> >>> If the temperature over a period of time High,over 120C >>> the resulting TSHUT gave CRU module,let it reset >>> the entire chip,or via GPIO give PMIC. >>> >>> Signed-off-by: Caesar Wang >>> --- >>> arch/arm/boot/dts/rk3288.dtsi | 21 +++++++++++++++++++++ >>> 1 file changed, 21 insertions(+) >>> >>> diff --git a/arch/arm/boot/dts/rk3288.dtsi >b/arch/arm/boot/dts/rk3288.dtsi >>> index cb18bb4..85fc17a 100644 >>> --- a/arch/arm/boot/dts/rk3288.dtsi >>> +++ b/arch/arm/boot/dts/rk3288.dtsi >>> @@ -15,6 +15,7 @@ >>> #include >>> #include >>> #include >>> +#include >>> #include "skeleton.dtsi" >>> >>> / { >>> @@ -66,6 +67,7 @@ >>> 216000 900000 >>> 126000 900000 >>> >; >>> + #cooling-cells = <2>; /* min followed by max */ >>> clock-latency = <40000>; >>> clocks = <&cru ARMCLK>; >>> }; >>> @@ -346,6 +348,19 @@ >>> status = "disabled"; >>> }; >>> >>> + tsadc: tsadc@ff280000 { >>> + compatible = "rockchip,rk3288-tsadc"; >>> + reg = <0xff280000 0x100>; >>> + interrupts = ; >>> + clocks = <&cru SCLK_TSADC>, <&cru PCLK_TSADC>; >>> + clock-names = "tsadc", "apb_pclk"; >>> + pinctrl-names = "default"; >>> + pinctrl-0 = <&otp_out>; >>> + #thermal-sensor-cells = <1>; >>> + hw-shut-temp = <120000>; >> I do not think this is a good value. You have (in the other DTS file) >> passive trip point at 80 and critical (which should result in orderly >> shutdown) at 125. But here you define hardware-controlled shutdown at >> 120C, which is backwards. You should have: >> >> passive <= critical <= hardware >Hmmm.... >but, the system will shutdown when temperature over critial value, >there is no chance of triggering the TSHUT. > >If the temperature over a period of time High,as we know, >the resulting TSHUT gave CRU module,let it hot-reset the entire chip, >or via GPIO give PMIC cold-reset the entire chip. Having tshut trigger is not the goal, tshut is the measure of last resort. If we can handle thermal conditions without triggering tshut, we achieved our goal. Tshut triggering is " oh, crap, nothing we tried works" scenario. Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/