linux-kernel - [PATCH v2 1/2] dt-bindings: Add the "init" pinctrl in this document

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Message-Id: <1445477130-17065-2-git-send-email-wxt@rock-chips.com>
Date:	Thu, 22 Oct 2015 09:25:29 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>, dianders@...omium.org,
	Eduardo Valentin <edubezval@...il.com>,
	Caesar Wang <wxt@...k-chips.com>, 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>
Subject: [PATCH v2 1/2] dt-bindings: Add the "init" pinctrl in this document

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:
  - As the Rob comments, add the 'init' pinctrl more decription in document.
  - fix the subject to make more obvious in PATCH[1/2]
Series-changes: 1
  - As the Doug comments, add the 'init' property to sync document.

Changes in v1: None

 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
@@ -27,8 +27,9 @@ 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";
+	pinctrl-0 = <&otp_gpio>;
+	pinctrl-1 = <&otp_out>;
 	#thermal-sensor-cells = <1>;
 	rockchip,hw-tshut-temp = <95000>;
 	rockchip,hw-tshut-mode = <0>;
-- 
1.9.1

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