ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<pinchartl> linusw__: should GPIO drivers serialize access ? is concurrent access considered a bug in the caller, or should the GPIO driver handle that ?
<pinchartl> I suppose I should handle it in the GPIO driver, as multiple GPIOs are handled in the same hardware register
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<linusw__> pinchartl: since s GPIO can only be requested by one consumer I don't see how there can ever be two concurrent calls?
<linusw__> But concurrency toward a single register is another thing indeed, there you need a spinlock or mutex.
<linusw__> As far as there are several GPIOs controlled by the same register.
<linusw__> If a consumer (device driver) has multiple threads running then I guess concurrency could happen, then the consumer needs to serialize access to the GPIO descriptor.
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