On Monday 25 March 2013 00:04:37 Mark Brown wrote: > On Sun, Mar 24, 2013 at 11:44:59PM +0100, Pali Rohár wrote: > > On Sunday 24 March 2013 23:14:46 Mark Brown wrote: > > > Well, you should seek support from the board vendor then. > > > > Not possible. Nokia is already using Windows Phones and life > > cycle for Nokia N900 phone is at the end. And Nokia never > > released any HW documentations to community... > > There may well still be people with the required information, > though in general this sort of thing is always going to be a > hazard when working on undocumented hardware. > > > Another question: what was reason for that commit > > ec400c9fab99d16a491cea17d27d0c6a5780b97c > > "lis3lv02d: make regulator API usage unconditional" ? > > Failing to provide power to a device is typically a very > serious problem for device operation but the code that was > there handles such errors by ignoring them. This isn't a > robust way forwards and such code should never have been > merged in the first place, as the changelog says the > regulator core provides a number of facilities for stubbing > itself out when it is not required which boards should use. > > Handling the possibility that supplies may not be there not > only creates needless repetitive complexity in device drivers > but also decreases the robustness of the system since error > handling for access to powered down devices often isn't very > pretty and other drivers or the core may disrupt the > operation of the device by for example powering it down due > to not thinking it's in use. > > > I think that for N900 support is reverting above commit > > needed, I do not see other solution... > > If you're convinced that the regulator is kept on for some > reason you could always just provide a fake supply, though > obviously it would be better to hook up the real regulator > since this may break if at some point the kernel decides that > whatever is actually providing the supply is unused and can > be turned off.
CCing Aaro and Tony. Look at this thread on: https://lkml.org/lkml/2013/2/16/152 What do you think how to fix this problem? I do not know about any HW regulator for n900 accelerometer and possible solutions could be revert that commit or adding fake regulator to board code... -- Pali Rohár [email protected]
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