Linux/AM5728: AM57xx-EVM

Geek13

Part Number: AM5728

Tool/software: Linux

which dts file is used to change pinmux setting for AM57xx-Evm Reva 3 having Linux SDK on it.

Am able to change pinmux setting by doing change on mux_data.h and re-compile u-boot, but is there any other to do pin-mux without touching u-boot part

over 6 years ago

0 Pavel Botev over 6 years ago

TI__Guru**** 170625 points

Hi Akash,

Only MMC pinmux is done in kernel, everything else is done in u-boot-spl. Check below e2e thread for details:

e2e.ti.com/.../661048

Regards,
Pavel

0 Geek13 over 6 years ago in reply to Pavel Botev

Expert 1215 points

Hi Pavel,
Is there any process define somewhere to do pin-muxing using u-boot-spl.
But in case of gpio if i do following changes in am57xx-beagle-x15-common.dtsi, am able to access those pins.
&dra7_pmx_core {
gpio_pins: gpio_pins {
pinctrl-single,pins
DRA7XX_CORE_IOPAD(address, PIN_OUTPUT | MUX_MODE15)
>;
};

Can i know the exact process of how pin mux could be done in right manner .

0 Pavel Botev over 6 years ago in reply to Geek13

TI__Guru**** 170625 points

Akash,

For official docs regarding AM57x pinmux, you can refer to the below:

www.ti.com/.../sprac44a.pdf

software-dl.ti.com/.../Foundational_Components_Tools.html
AM57xx u-boot

Below e2e thread is also good reference:

e2e.ti.com/.../758470

Regarding GPIO, yes you can do the pinmux in u-boot or kernel, but then you might get this glitch described in the errata:

i869 IO Glitches Can Occur When Changing IO Settings

Regards,
Pavel

0 Geek13 over 6 years ago in reply to Pavel Botev

Expert 1215 points

Thanks a lot Pavel.

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Linux/AM5728: AM57xx-EVM