Hi.

 

Instruction and dts on https://github.com/hbars/BPI-M2-Ultra-Berry-i2c-enable

 

 

Edited April 20, 20197 yr by hbars

Tnx. Check this: https://github.com/armbian/sunxi-DT-overlays

Since H3 and R40 are similar, I presume the overlays already provided in any Armbian images under /boot/dtb/overlay should already work.

2 hours ago, martinayotte said:

Since H3 and R40 are similar, I presume the overlays already provided in any Armbian images under /boot/dtb/overlay should already work.

 

 ____  ____  _   __  __ ____    ____
| __ )|  _ \(_) |  \/  |___ \  | __ )  ___ _ __ _ __ _   _
|  _ \| |_) | | | |\/| | __) | |  _ \ / _ \ '__| '__| | | |
| |_) |  __/| | | |  | |/ __/  | |_) |  __/ |  | |  | |_| |
|____/|_|   |_| |_|  |_|_____| |____/ \___|_|  |_|   \__, |
                                                     |___/

Welcome to ARMBIAN 5.81 user-built Debian GNU/Linux 9 (stretch) 5.0.7-sunxi
package bsp-kernel[5.81] u-boot[5.81] dtb[5.81] firmware[5.81] config[5.81]

root@bpi-m2-berry(192.168.6.20):/# more /boot/armbianEnv.txt
verbosity=1
logo=disabled
console=both
disp_mode=1920x1080p60
overlay_prefix=sun8i-h3
rootfstype=ext4
overlays=analog-codec i2c0

 

59 minutes ago, martinayotte said:

Since H3 and R40 are similar, I presume the overlays already provided in any Armbian images under /boot/dtb/overlay should already work. 

But not work. And how can they work when in dts and dtsi nowhere describes the pins of the ports.

 

1 hour ago, hbars said:

But not work. And how can they work when in dts and dtsi nowhere describes the pins of the ports.

At least for I2C-0, where the PMIC is attached, they are there, but for the other ports, you can prepare a patch and submit a PR to Armbian ...

35 minutes ago, martinayotte said:

At least for I2C-0, they are there, but for the other ports, you can prepare a patch and submit a PR to Armbian ...

I2C-0 doenst work for me on the M2 Berry (like - with the same commands - on my NanoPi Neo Core2)

But I also cant compile the V40-I2C-0
 

root@bpi-m2-berry(192.168.6.20):/home/guido# dtc -I dts -O dtb v40-bananapi-m2-berry-i2c-0.dts -o v40-bananapi-m2-berry-i2c-0.dtbo
Error: v40-bananapi-m2-berry-i2c-0.dts:2.2-8 syntax error
FATAL ERROR: Unable to parse input tree

I did wget the raw version od the dts and also did a clipboard-copy - but the has the same error.

 

When I activate i2C-0 from normal armbian-config I do get
 

root@bpi-m2-berry(192.168.6.20):/home/guido# i2cdetect -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: 30 31 32 33 34 35 36 37 -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@bpi-m2-berry(192.168.6.20):/home/guido# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

but my I2C clock should be at 68 on I2C-0 like on my NanoPi Neo Core2

echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-0/new_device
modprobe rtc-ds1307

i2cdetect -y 0

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

armbian:
https://raw.githubusercontent.com/armbian/sunxi-DT-overlays/master/sun8i-h3/sun8i-h3-i2c0.dts
V40:
https://raw.githubusercontent.com/hbars/BPI-M2-Ultra-Berry-i2c-enable/master/v40-bananapi-m2-berry-i2c-0.dts

 

On 4/20/2019 at 9:34 PM, martinayotte said:

At least for I2C-0, where the PMIC is attached, they are there, but for the other ports, you can prepare a patch and submit a PR to Armbian ...

So they already are.

https://github.com/hbars/BPI-M2-Ultra-Berry-i2c-enable/blob/master/v40-bananapi-m2-berry-i2c-1.dts

https://github.com/hbars/BPI-M2-Ultra-Berry-i2c-enable/blob/master/v40-bananapi-m2-berry-i2c-2.dts

Just gonna leave this here, because-as how to promote the patch does not know... And about PMIC pins I saw.

Strange why was not describe the rest.

Can you please provide the binarys I also can not compile the dts files. Get the same error.

Get it working with a newer version

 

$ wget http://httpredir.debian.org/debian//pool/main/d/device-tree-compiler/device-tree-compiler_1.4.7-3_armhf.deb

$ dpkg --install device-tree-compiler_1.4.7-3_armhf.deb

Using it for an OLED in i2c and it is working now

On 4/24/2019 at 10:04 PM, hbars said:

So they already are.

https://github.com/hbars/BPI-M2-Ultra-Berry-i2c-enable/blob/master/v40-bananapi-m2-berry-i2c-1.dts

https://github.com/hbars/BPI-M2-Ultra-Berry-i2c-enable/blob/master/v40-bananapi-m2-berry-i2c-2.dts

Just gonna leave this here, because-as how to promote the patch does not know... And about PMIC pins I saw.

Strange why was not describe the rest.

 

Howdy,

I pick-up this old thread since I've been experimenting with i2c on m2u berry.

The above patches did not work with 5.4.14, but with my own customized dts I was able to activate /dev/i2c-2 on 'buster'

Linux bananaberry 5.4.14-sunxi #rc1 SMP Sat Jan 25 15:19:01 CET 2020 armv7l GNU/Linux

Spoiler

/dts-v1/;
/plugin/;

/ {
        compatible = "allwinner,sun8i-h3";

        fragment@0 {
                target-path = "/aliases";
                __overlay__ {
                        i2c2 = "/soc/i2c@01c2b400";
                };
        };

        fragment@1 {
                target = <&pio>;
                __overlay__ {
                        i2c2_pins_a: i2c2@0 {
                                pins = "PB20", "PB21";
                                function = "i2c2";
                        };
                };
        };

        fragment@2 {
                target = <&i2c2>;
                __overlay__ {
                        pinctrl-names = "default";
                        pinctrl-0 = <&i2c2_pins_a>;
                        status = "okay";
                };
        };
};

 

> i2cdetect -y 2
	0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- 
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- 77

I can retrieve data from all i2c devices attached, however, enabling other overlays, such as spi-spidev in /boot/armbianEnv.txt with

 

overlay_prefix=sun8i-h3
overlays=spi-spidev
param_spidev_spi_bus=1
param_spidev_max_freq=100000000 

resulted in the loss of /dev/i2c-2 and no spidev at all. I tried different combinations of stock spi-spidev and i2c0, i2c1 ...

found in /boot/dtb/overlay. Furthermore, none of the uart overlays seem to work either.

 

At least I would like to enable i2c2, spidev and uart at the same time, but I couldn't find the desired information within
the existing threads.

 

5 hours ago, luetzel said:

resulted in the loss of /dev/i2c-2 and no spidev at all.

If you look at schematic, SPI1 bus is sharing pins with UART2, so you can't have both at the same time !

I woulkd rather suggest to use SPI0 instead, it won't conflict with UART2 ...

Thanks for your fast reply. I tried

param_spidev_spi_bus=0

as well, but also had no success with it.

 

7 minutes ago, luetzel said:

param_spidev_spi_bus=1

This still SPI1, you should have specified for SPI0 :

param_spidev_spi_bus=0

 

EDIT : Oh ! I've just saw a difference between M2-Berry UART2 compared to other board using H3 instead of V40. The UART2 is defaulted to PI18/PI19 instead of PA0/PA1. So, you will have to tweak DT here again ...

Yes, you're right. Anyway, all combinations of i2c, spidev and uart failed and I have no clue how to fix it.

 

2 hours ago, luetzel said:

I have no clue how to fix it.

Maybe by editing Main DT directly instead of using overlays ...

 

EDIT: Ok ! I added UART2 patches to my build, and I will commit them in Armbian as soon tests will be done.

EDIT2: Committed : https://github.com/armbian/build/commit/64e494384b546be7ba35b32a1ab904389fed4e35

On 2/3/2020 at 9:17 AM, luetzel said:

I have no clue how to fix it.

I've done more work and few more commits : there is now R40 distinct overlays for UART2/UART4/UART5/UART7 and SPIDEV0/SPIDEV1.

Feel free to build new images using Armbian build scripts ...

Okay, thanks! I'll give it a try, as soon as I'll find some time for it.