On Wed, Feb 08, 2017 at 10:11:21AM +0000, Jonas Mark (ST-FIR/ENG1) wrote: > Hello Dmitry, > > > > extend the pwm-beeper driver to support customized frequency > > > for SND_BELL from device tree. > > > > No, SND_BELL is literally SND_TONE @1000Hz. There should be no > > customizing. If applications want to use different frequency then should > > be using SND_TONE. > > We are not aiming for an application shortcut here. Instead, changing > the bell frequency shall be a system setting. That is, every > application which wants to make a bell sound shall use the alternative > frequency. > > The reason why we are deviating from the default 1000 Hz is that on > our hardware we are using a loudspeaker which is rated for 2.7 kHz. > That is, it will only sound at the specified volume and frequency if > you feed it with a 2.7 kHz square wave. If you deviate from it, e.g. > by using 1000 Hz, the output will be dim and squeaky. Worst case, > SND_BELL would be completely silent on our system. So the only bell > sound we can reliably generate on our system has 2.7 kHz. OK, fair enough. Please address Rob's comments on binding and resend. Also I am not sure why you needed to change the switch statement around, you only need to replace 1000 with value from the attribute. Oh, and please use device_property_*() API instead of of_*(). Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
