linux-kernel - Re: [PATCH v4 1/3] dt-bindings: rockchip-thermal: Add the pinctrl states in this document

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Date:	Fri, 23 Oct 2015 08:29:23 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Doug Anderson <dianders@...omium.org>,
	Eduardo Valentin <edubezval@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-rockchip@...ts.infradead.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Pawel Moll <pawel.moll@....com>,
	Zhang Rui <rui.zhang@...el.com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v4 1/3] dt-bindings: rockchip-thermal: Add the pinctrl
 states in this document

On Fri, Oct 23, 2015 at 6:25 AM, 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" and "sleep" pinctrl as the OTP gpio state, since we need
> switch the pin to gpio state before the TSADC controller is reset.
>
> AFAIK, 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>

Acked-by: Rob Herring <robh@...nel.org>

> ---
>
> Changes in v4: None
> Changes in v3:
>   - Add the pictrl states decription in document.
>
> 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.
>
>  .../devicetree/bindings/thermal/rockchip-thermal.txt          | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt b/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
> index ef802de..b38200d 100644
> --- a/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/rockchip-thermal.txt
> @@ -12,6 +12,11 @@ Required properties:
>  - resets : Must contain an entry for each entry in reset-names.
>            See ../reset/reset.txt for details.
>  - reset-names : Must include the name "tsadc-apb".
> +- pinctrl-names : The pin control state names;
> +- pinctrl-0 : The "init" pinctrl state, it will be set before device probe.
> +- pinctrl-1 : The "default" pinctrl state, it will be set after reset the
> +             TSADC controller.
> +- pinctrl-2 : The "sleep" pinctrl state, it will be in for suspend.
>  - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description.
>  - rockchip,hw-tshut-temp : The hardware-controlled shutdown temperature value.
>  - rockchip,hw-tshut-mode : The hardware-controlled shutdown mode 0:CRU 1:GPIO.
> @@ -27,8 +32,10 @@ tsadc: tsadc@...80000 {
>         clock-names = "tsadc", "apb_pclk";
>         resets = <&cru SRST_TSADC>;
>         reset-names = "tsadc-apb";
> -       pinctrl-names = "default";
> -       pinctrl-0 = <&otp_out>;
> +       pinctrl-names = "init", "default", "sleep";
> +       pinctrl-0 = <&otp_gpio>;
> +       pinctrl-1 = <&otp_out>;
> +       pinctrl-2 = <&otp_gpio>;
>         #thermal-sensor-cells = <1>;
>         rockchip,hw-tshut-temp = <95000>;
>         rockchip,hw-tshut-mode = <0>;
> --
> 1.9.1
>
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