| Message ID | 1602506642-5262-3-git-send-email-Anson.Huang@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [V2,1/3] arm64: dts: imx8mm: Correct WDOG_B pin configuration | expand |
On Mon, Oct 12, 2020 at 08:44:02PM +0800, Anson Huang wrote: > 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(-) Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Best regards, Krzysztof
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 >; }; };
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(-)