Re: [PATCHv5 0/8] 2c: Relax mandatory I2C ID table passing

[Lee Jones]

On Wed, 04 May 2016, Kieran Bingham wrote:

> This patch set finally pops up again, after a long time stuck somewhere in the
> midst of my stack.
> 
> As it stood last year, the requirements were to rename probe2 to probe_new, and
> ensure that it was correctly tested. The rename was the easy bit, but the
> testing took me more time to get things set up properly. And other commitments
> then got in the way of things. Of course this patch set has also been rebased
> as well, but there wasn't any major pain there.
> 
> Testing
> -------
> 
> To try to establish testing, I have used a beagle-bone-black, and a DS1307 RTC
> connected to the BBB SCL and SDA lines. The main reason for these choices is
> accesibility. i.e. I have them, and the BBB readily boots a kernel for me to
> test and iterate with.
> 
> I've tested the device with i2cdetect, and then worked through testing the
> sysfs interface, device tree, and module autoloading, each time ensuring that
> the RTC enumerates and operates
> 
> * new_device (built-in, and external module)
>   echo ds1307 0x68 > /sys/bus/i2c/devices/i2c-2/new_device
>   cat /sys/class/rtc/rtc0/date
> 
>  - Both of those worked fine.
> 
> * Device Tree
>   I tested that the device would still register by adding a node in the device
>   tree for the board, and testing with a built-in module. 
> 
>  - This worked fine.
> 
> * Module Autoloading
>   With the device tree node in the board dts file, it wouldn't automatically
>   load from the external module. This was due to the rtc-ds1307 module not
>   exporting an of_match table, and not yet having Javier's "report OF style
>   modalias when probing using DT" [0]  patch applied
> 
>  - With the module updated, and Javiers patch applied, the module autoloads
> 
> Finally, I feel I can safely add this tag to the patch set:
> Tested-by: Kieran Bingham <kieran@xxxxxxxxxxx>

Great work Kieran.

Wolfram, Javier,

Looks like Kieran has ticked each of your boxes.

I guess there is nothing stopping this set from being applied now,
right?

> Please let me know if there is any other specific use case missing here that
> needs to be tested.
> 
> [0] https://patchwork.ozlabs.org/patch/502201/
> 
> Patches
> -------
> Lee Jones (8):
>   i2c: Add pointer dereference protection to i2c_match_id()
>   i2c: Add the ability to match device to compatible string without an
>     of_node
>   i2c: Match using traditional OF methods, then by vendor-less
>     compatible strings
>   i2c: Make I2C ID tables non-mandatory for DT'ed devices
>   i2c: Export i2c_match_id() for direct use by device drivers
>   i2c: Provide a temporary .probe_new() call-back type
>   mfd: 88pm860x: Move over to new I2C device .probe() call
>   mfd: as3722: Rid driver of superfluous I2C device ID structure
> 
>  drivers/i2c/i2c-core.c      | 75 +++++++++++++++++++++++++++++++++++++++------
>  drivers/mfd/88pm860x-core.c |  5 ++-
>  drivers/mfd/as3722.c        | 12 ++------
>  include/linux/i2c.h         | 22 ++++++++++++-
>  4 files changed, 91 insertions(+), 23 deletions(-)
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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