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
>
>
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