Thanks very much, Pabs! I will follow up on those links and hopefully get a better understanding of what is going on and why. Perhaps the next time someone has a question like mine, I'll be able to be as helpful to them as the folks here have been to me!
Rick On Tue, Apr 18, 2023, at 4:57 PM, Paul Wise wrote: > On Mon, 2023-04-17 at 22:21 -0700, Rick Thomas wrote: > >> What would have been even greater is if the error messages include >> references to some documentation that explained the problem and gave >> some clues to the larger context in which the problem arose. > > The messages I sent that patch adding are for very simple issues; > "/proc not mounted", "/sys not mounted" and "i2c-dev not loaded" and > since they all have very simple solutions, I just added the commands > to fix them instead of pointers to documentation about each error. > > Probably the i2c manual pages should get some links to the Linux kernel > documentation and wiki for I2C. I'm unlikely to work on that though, > hopefully someone else is willing to do that. > >> For example, I'd like to know why it chose bus3 rather than one of >> the other busses (0,1,2,4)? > > I expect that depends on the bus driver code for your device, > those do not seem to document their ordering though and it > looks like your particular i2c bus driver has no documentation. > > https://www.kernel.org/doc/html/latest/i2c/busses/index.html > >> I'd also like to know what the various modules do and what kinds of >> parameters there are to influence the detailed behavior? > > Looks like the devices are defined by DeviceTree, ACPI, board files, > dynamically by drivers for other devices, hardware probing or sysfs: > > https://www.kernel.org/doc/html/latest/i2c/instantiating-devices.html > >> And where is the documentation for the magic writing into /sys ? > > Seems to be here: > > https://www.kernel.org/doc/html/latest/i2c/instantiating-devices.html#method-4-instantiate-from-user-space > https://www.kernel.org/doc/html/latest/i2c/i2c-sysfs.html > > These may also be useful: > > https://www.kernel.org/doc/html/latest/i2c/ > https://archive.kernel.org/oldwiki/i2c.wiki.kernel.org/ > > PS: I am subscribed, no need to CC me, please respect Reply-To. > > -- > bye, > pabs > > https://wiki.debian.org/PaulWise > > Attachments: > * signature.asc
