topic Re: kernel config IOmux in i.MX Processors

kernel config IOmux

faustosessego1 — Fri, 14 Apr 2017 13:02:38 GMT

Hi,
I configured all peripehricals / IO into u-boot.
I know there is the possibility to call the number 0x80000000 into kernel to get the previous setting:

for example

&iomuxc {      pinctrl-names = "default";      pinctrl-0 = <&pinctrl_hog>;       hog {           pinctrl_hog: hoggrp {           fsl,pins = <                 /* gpio-leds */                MX6QDL_PAD_EIM_D28__GPIO3_IO28 0x80000000                MX6QDL_PAD_EIM_A25__GPIO5_IO02 0x80000000                 /* J11 pins 32, 34, 36, 38 */                MX6QDL_PAD_CSI0_DAT8__GPIO5_IO26     8                MX6QDL_PAD_CSI0_DAT9__GPIO5_IO27     8                MX6QDL_PAD_KEY_COL1__GPIO4_IO08          8                MX6QDL_PAD_KEY_ROW1__GPIO4_IO09          8           >;           };      }; };

In this way, i avoid to configure again the IO.

What do you suggest?

To configure all pin into u-boot and after to call 0x80000000 for all IO into kernel, or to configure again?

What is it the correct procedure?

thank you

Re: kernel config IOmux

igorpadykov — Mon, 17 Apr 2017 05:59:50 GMT

Hi Fausto

you are right, according to linux/Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt :

Bits used for CONFIG:
NO_PAD_CTL(1 << 31): indicate this pin does not need config.

Best regards
igor
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Re: kernel config IOmux

faustosessego1 — Thu, 20 Apr 2017 09:37:56 GMT

Ok,

what is the best practice?

To set all peripherals into u-boot and after to call NO_PAD_CTL(1 << 31)?

Thanks

Re: kernel config IOmux

igorpadykov — Thu, 20 Apr 2017 10:07:27 GMT

I believe both options are acceptable.

Best regards
igor