AM335x .dts file

Ronodeep Daityari1

Other Parts Discussed in Thread: AM3352

Hi,

In am335x-bone-common.dtsi.

the following pin mux is defined for a gpio.

user_leds_default: user_leds_default {
pinctrl-single,pins = <
0x54 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* gpmc_a5.gpio1_21 */

How do i come to know about the pin no., in this case 0x54., for a particular intended pin. Lets say if i want to mux the UART 4 pins then how do i get the pin number for the uart4 tx and rx.?

Thanks

-RD

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi RD,

0x54 is the offset for the pad configuration register for pin GPMC_A5. You will find the complete list of pad configuration registers with offsets in the AM335X TRM Rev. K, Table 9-7 (starting at page 1364). Please note that these registers start from 0x800, so the full offset for pin GPMC_A5 is actually 0x854. Pins are named after their function in muxmode 0.

0 Max Yang over 11 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

Where I can get documents for writing my own dts-file, it's for AM3352 ?

0 Biser Gatchev-XID over 11 years ago in reply to Max Yang

TI__Guru**** 393215 points

You may find this helpful: http://www.google.bg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=16&ved=0CFAQFjAFOAo&url=http%3A%2F%2Fwww.deyisupport.com%2Fcfs-file.ashx%2F__key%2Fcommunityserver-discussions-components-files%2F25%2F7635.Device-Tree-Overview.pdf&ei=3DOtVLbjNsnyUvz2gdAO&usg=AFQjCNHSPypmuTyJB0_dTqTI3WrllTS2Hg

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AM335x .dts file