topic Re: dts: describe GPIO in i.MX Processors

dts: describe GPIO

BrilliantovKiri — Fri, 24 Jul 2015 13:15:30 GMT

Hello!

I work with iMX287 and linux-3.18.7, now I write dts file for my board and I have to configure GPIO.

pinctrl@80018000 {

gpio0_0: gpio0_0@0 {

reg = <0>;

fsl,pinmux-ids = <MX28_PAD_GPMI_D00__GPMI_D0>;

};

gpio0_1: gpio0_1@0 {

reg = <0>;

fsl,pinmux-ids = <MX28_PAD_GPMI_D01__GPMI_D1 >;

};

But I don't know how should I describe fsl,drive-strength, fsl,voltage and fsl,pull-up if:

- GPIO0_0 is input and hight in normal

- GPIO0_1 is output

Can you help me?

Thank you and excuse my bad english/

igorpadykov — Sat, 25 Jul 2015 07:33:40 GMT

Hi Kirill

one can look at p.39 below tutorial

Best regards

igor

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lategoodbye — Sat, 25 Jul 2015 18:16:14 GMT

Hi Kirill,

pinmux ids in your devicetree source are wrong if you want to use them as GPIO.

You will need to use MX28_PAD_GPMI_D00__GPIO_0_0 and MX28_PAD_GPMI_D01__GPIO_0_1 instead.

Please look at MX28 reference manual for more details about pincontrol.