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gpio.4: document device hints common to all devices on gpiobus

Description

gpio.4: document device hints common to all devices on gpiobus

"at" keyword is documented in device.hints(5) for all buses, but it does
hurt to add another reference to it.
"pins" keyword is specific to gpiobus.
At least these two hints should be configured for any gpiobus device on
a hints based system.

MFC after: 10 days

Details

Committed
avgJun 26 2019, 7:38 AM
Parents
rS349407: fix up r349406, add missing .El
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