Where is the best place to change pin settings for devices?

John Drinkall

I am using an SPI device (SPI3) that has a number of shared pins. Where is the best location to configure the pin mux settings?

I ask because I have changed this in the bootloader (XLDR), but by the time that it gets to the driver, the MUX_MODE setting has been set to 7 (safe mode)

Where's the best location for these pin settings?

Cheers

over 12 years ago

0 Michael T over 12 years ago

TI__Expert 6735 points

There is some excelent training material here. Check out the Board Port material. Separate for u-boot and Linux kernel.

http://processors.wiki.ti.com/index.php/Sitara_Linux_Software_Developer%E2%80%99s_Guide#Linux_Training

MichaelT

0 1258021 over 12 years ago

Genius 5120 points

Hi John,

AFAIK the best place is platform.c in X-Loader.

You need to check probably some other driver might be overwriting.

The other place is in SPI driver itself you can do that.

But if any other driver which loads after SPI is overwriting you will still have an issue. So try to identify the module which is changing the pinmux values for SPI.

Regards,

GSR

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Where is the best place to change pin settings for devices?