Layerscape中的主题 Re: How to access GPIO in LS1021AIOT board from u-boot.

How to access GPIO in LS1021AIOT board from u-boot.

dhruvalkumarpat — Tue, 05 Jul 2016 14:09:37 GMT

I have used few processor pins as GPIO and I want to add specific GPIO functionality(set , clear , toggle) to those pin. Which files to include for GPIO support for LS1021AIOT board. I didn't find a files that I can use and modify GPIO at will . Can nay one guide me here ?? I do know the set and clear function for u-boot. but I am talking about the structure for GPIO.

Thanks

Dhruval

Re: How to access GPIO in LS1021AIOT board from u-boot.

pro-supportengi — Tue, 05 Jul 2016 18:17:46 GMT

Have the same question for the LS1043ARDB.

Re: How to access GPIO in LS1021AIOT board from u-boot.

alexander_yakov — Wed, 06 Jul 2016 13:42:43 GMT

We do not offer GPIO driver for U-boot for our LS1021A processor, but U-boot driver structure is relatively simple, so you can create your own GPIO driver using other GPIO drivers as reference. For example drivers please look /drivers/gpio/ folder in U-boot sources.

Re: How to access GPIO in LS1021AIOT board from u-boot.

dhruvalkumarpat — Wed, 06 Jul 2016 13:55:21 GMT

Thanks . Is it possible to only use part of a PORT pins as GPIO ??? For Example I have eMMC connected on my BOARD which uses pins multiplexed with GPIO4 and I want to use GPIO4_21 and GPIO4_22 as GPIO pins for ls1020a .

Re: How to access GPIO in LS1021AIOT board from u-boot.

alexander_yakov — Wed, 06 Jul 2016 16:41:19 GMT

Yes, pins GPIO4_21 and GPIO4_22 are configurable separately. Please look LS1021A Reference Manual, Table 3-16 for more details.

Re: How to access GPIO in LS1021AIOT board from u-boot.

dhruvalkumarpat — Wed, 06 Jul 2016 19:50:57 GMT

Thanks a lot . Got it to work .