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authorMaxim Kiselev <bigunclemax@gmail.com>2021-02-17 16:10:00 +0300
committerBartosz Golaszewski <bgolaszewski@baylibre.com>2021-02-18 17:52:44 +0300
commita8002a35935aaefcd6a42ad3289f62bab947f2ca (patch)
treea7496c7662fc06e50935844f109b2f6063ae0343 /Documentation/devicetree
parent35d9e69592419fa2d138f64a2e4286635cdd98ac (diff)
downloadlinux-a8002a35935aaefcd6a42ad3289f62bab947f2ca.tar.xz
gpio: pcf857x: Fix missing first interrupt
If no n_latch value will be provided at driver probe then all pins will be used as an input: gpio->out = ~n_latch; In that case initial state for all pins is "one": gpio->status = gpio->out; So if pcf857x IRQ happens with change pin value from "zero" to "one" then we miss it, because of "one" from IRQ and "one" from initial state leaves corresponding pin unchanged: change = (gpio->status ^ status) & gpio->irq_enabled; The right solution will be to read actual state at driver probe. Cc: stable@vger.kernel.org Fixes: 6e20a0a429bd ("gpio: pcf857x: enable gpio_to_irq() support") Signed-off-by: Maxim Kiselev <bigunclemax@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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