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From:   Anson Huang <Anson.Huang@nxp.com>
To:     robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        kernel@pengutronix.de, festevam@gmail.com, krzk@kernel.org,
        aford173@gmail.com, daniel.baluta@nxp.com, shengjiu.wang@nxp.com,
        peter.chen@nxp.com, alifer.wsdm@gmail.com, abel.vesa@nxp.com,
        yibin.gong@nxp.com, jun.li@nxp.com, l.stach@pengutronix.de,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Cc:     Linux-imx@nxp.com
Subject: [PATCH V2 3/3] arm64: dts: imx8mp-evk: Correct WDOG_B pin configuration
Date:   Mon, 12 Oct 2020 20:44:02 +0800
Message-Id: <1602506642-5262-3-git-send-email-Anson.Huang@nxp.com>
In-Reply-To: <1602506642-5262-1-git-send-email-Anson.Huang@nxp.com>
References: <1602506642-5262-1-git-send-email-Anson.Huang@nxp.com>
Precedence: bulk

Different revision of i.MX8MP EVK boards may have different external
pull up registor design, some are enabled while some are NOT, to make
sure the WDOG_B pin works properly, better to enable internal pull up
resistor. Since enabling internal pull up resistor is NOT harmful and
having benefit of flexibility on different board design, just enable
it for all i.MX8MP boards; And schmitt input is NOT necessary for this
WDOG_B output pin, so remove it; Open drain outputs provide more
flexibility to a designer as they can be pulled-up to any voltage found
in the system, so enable it as well.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V1:
	- Provide more explanation of removing schmitt input and enabling open drain in commit msg.
---
 arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
index ad66f12..908b92b 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
@@ -262,7 +262,7 @@
 
 	pinctrl_wdog: wdoggrp {
 		fsl,pins = <
-			MX8MP_IOMUXC_GPIO1_IO02__WDOG1_WDOG_B	0xc6
+			MX8MP_IOMUXC_GPIO1_IO02__WDOG1_WDOG_B	0x166
 		>;
 	};
 };
-- 
2.7.4