* No hotplug event for PCA9685 PWM output device
@ 2017-04-12 12:09 Philip Munts
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From: Philip Munts @ 2017-04-12 12:09 UTC (permalink / raw)
To: linux-pwm
I am using a PCA9685 I2C PWM controller on a Raspberry Pi 2. When I instantiate the PCA9685 device with "echo pca9685 0x40 >new_device" in the I2C bus device directory, I get a hotplug event for pwmchip0, as expected. When I manually initiate a hotplug event with "echo add >uevent" from the pwmchip0 device directory, I get another hotplug event for pwmchip0, also as expected.
However, when I create a PWM output device with "echo 0 >export" from the pwmchip0 device directory, the PWM output device subdirectory pwm0 is created, including the uevent file, but no hotplug event is generated for pwm0.
Furthermore, when I attempt to manually initiate a hotplug event for pwm0 by running "echo add >uevent" from the pwm0 subdirectory, no hotplug event is generated.
I am using a custom 4.9.21 kernel. I have reported this at bugzilla.kernel.org: #195335.
Philip Munts
phil@munts.net
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