I2C/IIC working on RPI4 8GB?

[Mark Millard]

On 2021-Apr-30, at 00:51, Emmanuel Vadot <manu at bidouilliste.com> wrote:

> On Thu, 29 Apr 2021 17:57:45 +0100
> Mark Murray <markm at FreeBSD.org> wrote:
> 
>> On 28 Apr 2021, at 22:07, Mark Murray <markm at FreeBSD.org> wrote:
>>> 
>>> On 28 Apr 2021, at 09:19, Emmanuel Vadot <manu at bidouilliste.com> wrote:
>>> 
>>>> According to this document is this just to detect that the slave hold
>>>> the scl line too long so I don't think that this is the problem here.
>>>> If you have a scope or a logic analyzer I suggest you start by using
>>>> it to confirm that when you scan with i2c -s you see something.
>>> 
>>> As it turns out, my logic analyser arrived today.
>> 
>> I got an oscilloscope onto pins 3 and 5 (GPIO2 and GPIO3), and "i2c -s" does not a jot on them.
> 
> And this is with the i2cX.dtbo right ?
> Can you share the full dmesg please ?
> 
>> I don't know if this helps, but the gpioctl utility thinks the pins are both inputs:
> 
> I don't remember if the gpio/pinctrl controller in RPI still sees the
> pins when they are configured to an alt function or not but that does
> seems a bit strange yes.
> 
> Please share a full dmesg as I want to confirm that the pins are
> configured for i2c function.
> 
>> . . .
> 

In case you look at some of the notes I've sent out,
my RPi4B 8 GiBYte context shows:

The RPi4's context is back as of 2021-Mar-12:

merge-base: 7381bbee29df959e88ec59866cf2878263e7f3b2
merge-base: CommitDate: 2021-03-12 20:29:42 +0000
7381bbee29df (freebsd/main, freebsd/HEAD, pure-src, main) cam: Run all XPT_ASYNC ccbs in a dedicated thread
n245444 (--first-parent --count for merge-base)

Boot verbose reported for case independent gpio|i2c|iic
in dmesg -a from a boot -v :

gic0: <ARM Generic Interrupt Controller> mem 0x40041000-0x40041fff,0x40042000-0x40043fff,0x40044000-0x40045fff,0x40046000-0x40047fff irq 30 on simplebus0
gic0: pn 0x2, arch 0x2, rev 0x1, implementer 0x43b irqs 256
gpio0: <BCM2708/2835 GPIO controller> mem 0x7e200000-0x7e2000b3 irq 14,15 on simplebus0
gpiobus0: <OFW GPIO bus> on gpio0
Processing 1 pin-config node(s) in pinctrl-0 for serial at 7e201000
Processing 2 pin-config node(s) in pinctrl-0 for spi at 7e204000
gpio0: set pin 9 to func 4
gpio0: set pin 10 to func 4
gpio0: set pin 11 to func 4
gpio0: set pin 8 to func 1
gpio0: set pin 7 to func 1
Processing 1 pin-config node(s) in pinctrl-0 for i2c at 7e804000
Processing 1 pin-config node(s) in pinctrl-0 for bcm2835_audio
gpio0: set pin 40 to func 4
gpio0: set pin 41 to func 4
Processing 1 pin-config node(s) in pinctrl-0 for mmc at 7e300000
gpio0: set pin 48 to func 7, pull 0
gpio0: set pin 49 to func 7, pull 2
gpio0: set pin 50 to func 7, pull 2
gpio0: set pin 51 to func 7, pull 2
gpio0: set pin 52 to func 7, pull 2
gpio0: set pin 53 to func 7, pull 2
gpio1: <Raspberry Pi Firmware GPIO controller> on bcm2835_firmware0
gpiobus1: <GPIO bus> on gpio1
regfix0: Cannot set GPIO pin: 6
REGNODE_INIT failed: 6
regfix0: Cannot register regulator.
mbox0: <BCM2835 VideoCore Mailbox> mem 0x7e00b880-0x7e00b8bf irq 13 on simplebus0
gpioregulator0: <GPIO controlled regulator> on ofwbus0
. . .
gpioc0: <GPIO controller> on gpio0
uart0: <PrimeCell UART (PL011)> mem 0x7e201000-0x7e2011ff irq 16 on simplebus0
uart0: console (115200,n,8,1)
uart0: fast interrupt
uart0: PPS capture mode: DCD
simplebus0: <mmc at 7e202000> mem 0x7e202000-0x7e2020ff irq 17 disabled compat brcm,bcm2835-sdhost (no driver attached)
simplebus0: <i2s at 7e203000> mem 0x7e203000-0x7e203023 disabled compat brcm,bcm2835-i2s (no driver attached)
spi0: <BCM2708/2835 SPI controller> mem 0x7e204000-0x7e2041ff irq 18 on simplebus0
spibus0: <OFW SPI bus> on spi0
spibus0: <unknown card> at cs 0 mode 0
spibus0: <unknown card> at cs 1 mode 0
simplebus0: <i2c at 7e205000> mem 0x7e205000-0x7e2051ff irq 19 disabled compat brcm,bcm2711-i2c (no driver attached)
simplebus0: <i2c0mux> disabled compat i2c-mux-pinctrl (no driver attached)
simplebus0: <dpi at 7e208000> mem 0x7e208000-0x7e20808b disabled compat brcm,bcm2835-dpi (no driver attached)
simplebus0: <dsi at 7e209000> mem 0x7e209000-0x7e209077 irq 20 disabled compat brcm,bcm2835-dsi0 (no driver attached)
simplebus0: <aux at 7e215000> mem 0x7e215000-0x7e215007 compat brcm,bcm2835-aux (no driver attached)
simplebus0: <serial at 7e215040> mem 0x7e215040-0x7e21507f irq 21 disabled compat brcm,bcm2835-aux-uart (no driver attached)
simplebus0: <spi at 7e215080> mem 0x7e215080-0x7e2150bf irq 22 disabled compat brcm,bcm2835-aux-spi (no driver attached)
simplebus0: <spi at 7e2150c0> mem 0x7e2150c0-0x7e2150ff irq 23 disabled compat brcm,bcm2835-aux-spi (no driver attached)
simplebus0: <pwm at 7e20c000> mem 0x7e20c000-0x7e20c027 disabled compat brcm,bcm2835-pwm (no driver attached)
simplebus0: <hvs at 7e400000> mem 0x7e400000-0x7e405fff irq 24 disabled compat brcm,bcm2711-hvs (no driver attached)
simplebus0: <dsi at 7e700000> mem 0x7e700000-0x7e70008b irq 25 disabled compat brcm,bcm2711-dsi1 (no driver attached)
iichb0: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 26 on simplebus0
. . .
simplebus0: <i2c at 7e205600> mem 0x7e205600-0x7e2057ff irq 50 disabled compat brcm,bcm2711-i2c (no driver attached)
simplebus0: <i2c at 7e205800> mem 0x7e205800-0x7e2059ff irq 51 disabled compat brcm,bcm2711-i2c (no driver attached)
simplebus0: <i2c at 7e205a00> mem 0x7e205a00-0x7e205bff irq 52 disabled compat brcm,bcm2711-i2c (no driver attached)
simplebus0: <i2c at 7e205c00> mem 0x7e205c00-0x7e205dff irq 53 disabled compat brcm,bcm2711-i2c (no driver attached)
simplebus0: <pixelvalve at 7e206000> mem 0x7e206000-0x7e2060ff irq 54 disabled compat brcm,bcm2711-pixelvalve0 (no driver attached)
simplebus0: <pixelvalve at 7e207000> mem 0x7e207000-0x7e2070ff irq 55 disabled compat brcm,bcm2711-pixelvalve1 (no driver attached)
simplebus0: <pixelvalve at 7e20a000> mem 0x7e20a000-0x7e20a0ff irq 56 disabled compat brcm,bcm2711-pixelvalve2 (no driver attached)
simplebus0: <pwm at 7e20c800> mem 0x7e20c800-0x7e20c827 disabled compat brcm,bcm2835-pwm (no driver attached)
simplebus0: <pixelvalve at 7e216000> mem 0x7e216000-0x7e2160ff irq 57 disabled compat brcm,bcm2711-pixelvalve4 (no driver attached)
simplebus0: <pixelvalve at 7ec12000> mem 0x7ec12000-0x7ec120ff irq 58 disabled compat brcm,bcm2711-pixelvalve3 (no driver attached)
simplebus0: <clock at 7ef00000> mem 0x7ef00000-0x7ef0000f disabled compat brcm,brcm2711-dvp (no driver attached)
simplebus0: <interrupt-controller at 7ef00100> mem 0x7ef00100-0x7ef0012f irq 59 disabled compat brcm,bcm2711-l2-intc (no driver attached)
simplebus0: <hdmi at 7ef00700> mem 0x7ef00700-0x7ef009ff,0x7ef00300-0x7ef004ff,0x7ef00f00-0x7ef00f7f,0x7ef00f80-0x7ef00fff,0x7ef01b00-0x7ef01cff,0x7ef01f00-0x7ef022ff,0x7ef00200-0x7ef0027f,0x7ef04300-0x7ef043ff,0x7ef20000-0x7ef200ff,0x7ef00100-0x7ef0012f irq 60,61,62,63,64,65 disabled compat brcm,bcm2711-hdmi0 (no driver attached)
simplebus0: <i2c at 7ef04500> mem 0x7ef04500-0x7ef045ff,0x7ef00b00-0x7ef00dff disabled compat brcm,bcm2711-hdmi-i2c (no driver attached)
simplebus0: <hdmi at 7ef05700> mem 0x7ef05700-0x7ef059ff,0x7ef05300-0x7ef054ff,0x7ef05f00-0x7ef05f7f,0x7ef05f80-0x7ef05fff,0x7ef06b00-0x7ef06cff,0x7ef06f00-0x7ef072ff,0x7ef00280-0x7ef002ff,0x7ef09300-0x7ef093ff,0x7ef20000-0x7ef200ff,0x7ef00100-0x7ef0012f irq 66,67,68,69,70,71 disabled compat brcm,bcm2711-hdmi1 (no driver attached)
simplebus0: <i2c at 7ef09500> mem 0x7ef09500-0x7ef095ff,0x7ef05b00-0x7ef05dff disabled compat brcm,bcm2711-hdmi-i2c (no driver attached)
gpioc1: <GPIO controller> on gpio1
. . .
simplebus0: <gpiomem> mem 0x7e200000-0x7e200fff compat brcm,bcm2835-gpiomem (no driver attached)
. . .
gpioled0: <GPIO LEDs> on ofwbus0
. . .
iicbus0: <OFW I2C bus> on iichb0
usbus0: 5.0Gbps Super Speed USB v3.0
iic0: <I2C generic I/O> on iicbus0


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)