linux-kernel - Re: [PATCH 1/2] i2c: i801: Add 0x29 as I²C address for lis3lv02d in Dell Precision 3540

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Date: Fri, 22 Dec 2023 11:40:03 +0100
From: Wolfram Sang <wsa@...nel.org>
To: Paul Menzel <pmenzel@...gen.mpg.de>
Cc: Jean Delvare <jdelvare@...e.com>, Andi Shyti <andi.shyti@...nel.org>,
	Pali Rohár <pali@...nel.org>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] i2c: i801: Add 0x29 as I²C address for lis3lv02d in Dell Precision 3540

On Wed, Dec 20, 2023 at 05:10:01PM +0100, Paul Menzel wrote:
> On the Dell Precision 3540/0M14W7, BIOS 1.7.4 05/12/2020, Linux prints
> the warning below.
> 
>     i801_smbus 0000:00:1f.4: Accelerometer lis3lv02d is present on SMBus but its address is unknown, skipping registration
> 
> With the help of Wolfram Sang, the test to probe it on I²C bus 6 at address
> 0x29 was successful.
> 
>     $ cd /sys/bus/pci/drivers/i801_smbus/0000:00:1f.4
>     $ ls -d i2c-?
>     i2c-6
>     $ sudo i2cdetect 6
>     WARNING! This program can confuse your I2C bus, cause data loss and worse!
>     I will probe file /dev/i2c-6.
>     I will probe address range 0x08-0x77.
>     Continue? [Y/n] Y
>          0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
>     00:                         08 -- -- -- -- -- -- --
>     10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
>     20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
>     30: 30 -- -- -- -- 35 UU UU -- -- -- -- -- -- -- --
>     40: -- -- -- -- 44 -- -- -- -- -- -- -- -- -- -- --
>     50: UU -- 52 -- -- -- -- -- -- -- -- -- -- -- -- --
>     60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
>     70: -- -- -- -- -- -- -- --
> 
>     $ echo lis3lv02d 0x29 | sudo tee /sys/bus/i2c/devices/i2c-6/new_device
>     $ sudo dmesg
>     […]
>     [ 2110.787000] i2c i2c-6: new_device: Instantiated device lis3lv02d at 0x29
>     [ 2110.791932] lis3lv02d_i2c 6-0029: supply Vdd not found, using dummy regulator
>     [ 2110.791981] lis3lv02d_i2c 6-0029: supply Vdd_IO not found, using dummy regulator
>     [ 2110.809233] lis3lv02d: 8 bits 3DC sensor found
>     [ 2110.900668] input: ST LIS3LV02DL Accelerometer as /devices/platform/lis3lv02d/input/input23
> 
> So, the device has that accelerometer. Add the I2C address to the
> mapping list.
> 
> Link: https://lore.kernel.org/linux-i2c/97708c11-ac85-fb62-2c8e-d37739ca826f@molgen.mpg.de/
> Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>

Applied to for-next, thanks!


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