Linux/AM3358: Try to use i2c1 as u-boot command

Nguyen Hiep

Part Number: AM3358

Tool/software: Linux

Hi all,

I try to use i2c1 in u-boot. First, I enabled i2c1 as dts file like below:

&am33xx_pinmux {
i2c1_pins: pinmux_i2c1_pins {
pinctrl-single,pins = <
0x158 (PIN_INPUT_PULLUP | MUX_MODE2) /* spi0_d1.i2c1_sda */
0x15c (PIN_INPUT_PULLUP | MUX_MODE2) /* spi0_cs0.i2c1_scl */
>;
};
};

&i2c1 {
clock-frequency = <100000>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&i2c1_pins>;

};

When power my board, I can see i2c bus 1. But I can probe any address on this bus.

=> i2c dev 1
Setting bus to 1
=> i2c probe
Valid chip addresses: 18 68i2c_probe: pads on bus probably not configured (status=0x10)
i2c_probe: pads on bus probably not configured (status=0x10)
i2c_probe: pads on bus probably not configured (status=0x10)
i2c_probe: pads on bus probably not configured (status=0x10)

=> i2c bus
Bus 0: i2c@44e0b000
Bus 1: i2c@4802a000 (active 1)
18: generic_18, offset len 1, flags 0
68: generic_68, offset len 1, flags 0
Bus 2: i2c@4819c000

When I try to read value of register as address 0x18

=> i2c md 0x18 0.1 0x00
Timed out in wait_for_event: status=0000
Check if pads/pull-ups of bus are properly configured

In the kernel, I can use i2c bus 1. Please give me some advances for this case. My u-boot version is 2016.11-rc3

Thank you,

Hiep Nguyen

over 7 years ago

0 Pavel Botev over 7 years ago

TI__Guru**** 170625 points

Hi Hiep,

Do you use AM335x TI board or custom board?

Do you use AM335x TI PSDK? If yes, which version?

Regards,
Pavel

0 Nguyen Hiep over 7 years ago in reply to Pavel Botev

Prodigy 230 points

I'm working on custom board base on Beaglebone Black. I clone u-boot source code from github with version above.
Regards,
Hiep Nguyen

0 Pavel Botev over 7 years ago in reply to Nguyen Hiep

TI__Guru**** 170625 points

Hiep,

I would suggest you to try with u-boot coming with AM335x PSDK (link below) or below git branch.

software-dl.ti.com/.../index_FDS.html

uBoot Version: 2018.01
uBoot Description: v2018.01-227-g131dc82
Clone: git://git.ti.com/ti-u-boot/ti-u-boot.git
Branch: ti-u-boot-2018.01
uBoot Tag: ti2018.01

Regards,
Pavel

0 Nguyen Hiep over 7 years ago in reply to Pavel Botev

Prodigy 230 points

Hi Pavel,

In this version, How can I enable i2c bus 1 in the source code?
Thanks,
Hiep Nguyen

0 Pavel Botev over 7 years ago

TI__Guru**** 170625 points

Hiep,

Nguyen Hiep said:

&i2c1 {
clock-frequency = <100000>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&i2c1_pins>;

};

Nguyen Hiep said:
When I try to read value of register as address 0x18

You need to add a node describing the device you have attached on i2c1 bus addr 0x18. See for example AM335x TI EVM, it has LIS331DLH accelerometer attached on i2c1 addr 0x18:

u-boot/arch/arm/dts/am335x-evm.dts

&i2c1 {
   pinctrl-names = "default";
   pinctrl-0 = <&i2c1_pins>;

   status = "okay";
   clock-frequency = <100000>;

   lis331dlh: lis331dlh@18 {
       compatible = "st,lis331dlh", "st,lis3lv02d";
       reg = <0x18>;
       Vdd-supply = <&lis3_reg>;
       Vdd_IO-supply = <&lis3_reg>;

       st,click-single-x;
       st,click-single-y;
       st,click-single-z;
       st,click-thresh-x = <10>;
       st,click-thresh-y = <10>;
       st,click-thresh-z = <10>;
       st,irq1-click;
       st,irq2-click;
       st,wakeup-x-lo;
       st,wakeup-x-hi;
       st,wakeup-y-lo;
       st,wakeup-y-hi;
       st,wakeup-z-lo;
       st,wakeup-z-hi;
       st,min-limit-x = <120>;
       st,min-limit-y = <120>;
       st,min-limit-z = <140>;
       st,max-limit-x = <550>;
       st,max-limit-y = <550>;
       st,max-limit-z = <750>;
   };

Regards,
Pavel

0 Pavel Botev over 7 years ago in reply to Pavel Botev

TI__Guru**** 170625 points

If you have no more questions related to the subject of this e2e thread, please close/verify/resolve this thread.

Regards,
Pavel

Processors

Processors forum

Linux/AM3358: Try to use i2c1 as u-boot command