Thankyou for reviewing the patch. On 15/01/14 14:27, Linus Walleij wrote: > On Tue, Jan 14, 2014 at 3:52 PM, <srinivas.kandagatla@xxxxxx> wrote: > >> From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx> >> >> ST pin controller does not have hardware support for detecting edge >> triggered interrupts, It only has level triggering support. >> This patch attempts to fake up edge triggers from hw level trigger >> support in software. With this facility now the gpios can be easily used >> for keypads, otherwise it would be difficult for drivers like keypads to >> work with level trigger interrupts. >> >> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxx> > > Clever! Mostly I like the patch as it is but: > >> for_each_set_bit(n, &port_active, BITS_PER_LONG) { >> + /* check if we are detecting fake edges ... */ >> + pin_edge_cfg = ST_IRQ_EDGE_CONF(bank_edge_mask, n); >> + >> + if (pin_edge_cfg) { >> + /* edge detection. */ >> + val = st_gpio_get(&bank->gpio_chip, n); >> + if (val) >> + writel(BIT(n), bank->base + REG_PIO_SET_PCOMP); >> + else >> + writel(BIT(n), bank->base + REG_PIO_CLR_PCOMP); >> + >> + if (pin_edge_cfg != ST_IRQ_EDGE_BOTH && >> + !((pin_edge_cfg & ST_IRQ_EDGE_FALLING) ^ val)) >> + continue; >> + } >> + > > Please insert comments here to explain what you are actually doing > because I sure as hell do not understand this code without comments > describing the trick used. I agree, I will document this logic in next version. Thanks, srini > > Yours, > Linus Walleij > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html