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Mainline:Broadcom Kona/BCM590xx/PONKEY

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Revision as of 10:16, 19 February 2025 by Knuxify (talk | contribs) (Created page with "The BCM590XX PMU can handle a power-on key (the responsible section is nicknamed PONKEY). == Key press detection == When a key is pressed, the internal IRQ for a key press is raised; when it is released, the internal IRQ for a key release is raised. A driver can interpret these IRQs to toggle a key on/off (in downstream, it's wired up to <code>KEY_POWER</code> by default. === Debounce interval === A debounce interval can be configured independently for button press a...")
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The BCM590XX PMU can handle a power-on key (the responsible section is nicknamed PONKEY).

Key press detection

When a key is pressed, the internal IRQ for a key press is raised; when it is released, the internal IRQ for a key release is raised. A driver can interpret these IRQs to toggle a key on/off (in downstream, it's wired up to KEY_POWER by default.

Debounce interval

A debounce interval can be configured independently for button press and release. The debounce values are 3 bits wide and stored in PONKEYCTRL1.

For the BCM59054/BCM59056, the allowed values are 330ns, 1.2ms, 10ms, 50ms, 100ms, 500ms, 1000ms and 2000ms. For the BCM59039/BCM59042/BCM59055, the allowed values are undocumented, but different from BCM59054/56 - 3 is equal to 100ms (whereas it's 50ms on 54/56).

Timer

TODO. Seems like it might be possible to control long-press function using a timer (one of "poweroff", "restart" or "smart reset"). Relevant kernel sources, notably commented out.

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