Re: [PATCH v3 1/4] cmd: bind: Add unbind command with driver filter

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Marek,

marex@denx.de wrote on Mon, 31 Jul 2023 16:08:19 +0200:

> On 7/31/23 15:58, Miquel Raynal wrote:
> > Hi Marek,
> > 
> > marex@denx.de wrote on Mon, 31 Jul 2023 15:50:58 +0200:
> >   
> >> On 7/31/23 15:36, Miquel Raynal wrote:  
> >>> Hi Marek,
> >>>
> >>> marex@denx.de wrote on Mon, 31 Jul 2023 13:44:25 +0200:  
> >>>    >>>> On 7/31/23 11:31, Miquel Raynal wrote:  
> >>>>> Hi Marek,
> >>>>>
> >>>>> marex@denx.de wrote on Sat, 29 Jul 2023 16:57:09 +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@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@49000000 usb_ether
> >>>>>> "
> >>>>>>
> >>>>>> Signed-off-by: Marek Vasut <marex@denx.de>
> >>>>>> ---  
> >>>>>
> >>>>> I am no longer getting wrong pointer dereferences, the SPL is working in
> >>>>> recovery mode, TFTP "File not found" errors are no longer a problem and
> >>>>> I did not experience any reset while tftp'ing regular files.
> >>>>>
> >>>>> One last remaining request on my side is the need for using fastboot as
> >>>>> well which does no longer work as-is:  
> >>>>>     >>> => fastboot usb 0  
> >>>>> couldn't find an available UDC
> >>>>> g_dnl_register: failed!, error: -19
> >>>>> exit not allowed from main input shell.
> >>>>>
> >>>>> Can you advise what bind/unbind command would be necessary here?  
> >>>>
> >>>> Either 'unbind usb_ether' or run 'dm tree' -> look up the path to usb_ether in the tree (it will be hanging under usb_peripheral or some such), and then use 'unbind <that path>'.  
> >>>
> >>> Nice `dm tree` command, never used it before.
> >>>
> >>> Even when I unbind usb_ether I still get the same error:  
> >>>    >>> => unbind /ocp/usb@47400000/usb@47401000  
> >>> => fastboot usb 0  
> >>> couldn't find an available UDC
> >>> g_dnl_register: failed!, error: -19
> >>> exit not allowed from main input shell.
> >>>
> >>> Is there a specific gadget driver which I should bind again manually?  
> >>
> >> Can you share the output of dm tree before/after unbind ?
> >>
> >> fastboot should auto-bind to the right thing.  
> > 
> > Ok. Apparently it does not, but I don't have any clue why. If you want
> > me to check something else I will. Here is the output:
> > 
> > U-Boot 2023.07-00806-g979e7443428 (Jul 31 2023 - 11:17:06 +0200)  
> 
> [...]
> 
> >   watchdog      0  [ + ]   omap3_wdt             |   |-- wdt@44e35000
> >   misc          0  [ + ]   ti-musb-wrapper       |   |-- usb@47400000
> >   usb           0  [ + ]   ti-musb-peripheral    |   |   |-- usb@47401000
> >   ethernet      1  [ + ]   usb_ether             |   |   |   `-- usb_ether
> >   bootdev       3  [   ]   eth_bootdev           |   |   |       `-- usb_ether.bootdev
> >   usb           0  [   ]   ti-musb-host          |   |   `-- usb@47401800
> >   ethernet      0  [ + ]   eth_cpsw              |   |-- ethernet@4a100000
> >   bootdev       2  [   ]   eth_bootdev           |   |   `-- ethernet@4a100000.bootdev
> >   simple_bus   67  [   ]   ti_sysc               |   |-- target-module@53100000
> >   simple_bus   68  [   ]   ti_sysc               |   |-- target-module@53500000
> >   simple_bus   69  [   ]   ti_sysc               |   `-- target-module@56000000
> >   clk          62  [   ]   fixed_clock           |-- clk_mcasp0_fixed
> >   bootstd       0  [   ]   bootstd_drv           |-- bootstd
> >   bootmeth      0  [   ]   bootmeth_efi          |   |-- efi
> >   bootmeth      1  [   ]   bootmeth_extlinux     |   |-- extlinux
> >   bootmeth      2  [   ]   bootmeth_pxe          |   |-- pxe
> >   bootmeth      3  [   ]   vbe_simple            |   `-- vbe_simple
> >   timer         0  [ + ]   omap_timer            `-- timer@0  
> > => unbind /ocp/usb@47400000/usb@47401000  
> 
> The commit message of this patch contains the following example:
> unbind /soc/usb-otg@49000000 usb_ether
> so in your case, try
> unbind /ocp/usb@47400000/usb@47401000 usb_ether

Does not work, unfortunately:
=> unbind /ocp/usb@47400000/usb@47401000 usb_ether
Cannot find a device with path /ocp/usb@47400000/usb@47401000
=> unbind /ocp/usb@47400000/usb@47401000          
=>