[PATCH v4 1/4] cmd: bind: Add unbind command with driver filter

[Miquel Raynal]

Hi Marek,

marex at denx.de wrote on Wed,  2 Aug 2023 14:46:54 +0200:

> Extend the driver core to perform lookup by both OF node and driver
> bound to the node. Use this to look up specific device instances to
> unbind from nodes in the unbind command. One example where this is
> needed is USB peripheral controller, which may have multiple gadget
> drivers bound to it. The unbind command has to select that specific
> gadget driver instance to unbind from the controller, not unbind the
> controller driver itself from the controller.
> 
> USB ethernet gadget usage looks as follows with this change. Notice
> the extra 'usb_ether' addition in the 'unbind' command at the end.
> "
> bind /soc/usb-otg at 49000000 usb_ether
> setenv ethact usb_ether
> setenv loadaddr 0xc2000000
> setenv ipaddr 10.0.0.2
> setenv serverip 10.0.0.1
> setenv netmask 255.255.255.0
> tftpboot 0xc2000000 10.0.0.1:test.file
> unbind /soc/usb-otg at 49000000 usb_ether

This extra parameter does not seem to work on the BBBW. I cannot select
the "usb_ether" driver like you do.

Good news though, I am now able to use fastboot, but it is not
straightforward:

Here is my sequence right after the boot (reducing the dm tree output
to the usb nodes for clarity):

=> dm tree     
 misc          0  [ + ]   ti-musb-wrapper       |   |-- usb at 47400000
 usb           0  [ + ]   ti-musb-peripheral    |   |   |-- usb at 47401000
 ethernet      1  [ + ]   usb_ether             |   |   |   `-- usb_ether
 bootdev       3  [   ]   eth_bootdev           |   |   |       `-- usb_ether.bootdev
 usb           0  [   ]   ti-musb-host          |   |   `-- usb at 47401800
=> fastboot usb 0
couldn't find an available UDC
g_dnl_register: failed!, error: -19
exit not allowed from main input shell.
=> unbind /ocp/usb at 47400000/usb at 47401000 usb_ether
Cannot find a device with path /ocp/usb at 47400000/usb at 47401000
=> unbind /ocp/usb at 47400000/usb at 47401000          
=> dm tree
 misc          0  [ + ]   ti-musb-wrapper       |   |-- usb at 47400000
 usb           0  [   ]   ti-musb-host          |   |   `-- usb at 47401800
=> fastboot usb 0                                 
=> bind /ocp/usb at 47400000/usb at 47401000 ti-musb-peripheral 
=> dm tree                                               
 misc          0  [ + ]   ti-musb-wrapper       |   |-- usb at 47400000
 usb           0  [   ]   ti-musb-host          |   |   |-- usb at 47401800
 usb           0  [   ]   ti-musb-peripheral    |   |   `-- usb at 47401000
=> fastboot usb 0                                        
musb-hdrc: peripheral reset irq lost!
# works! (the irq-related line above as always been there)

So now, how do we make this process easy/understandable?

Thanks,
Miquèl