On 07/02/2015 05:21 PM, Richard Cochran wrote: > On Thu, Jul 02, 2015 at 04:30:47PM +0200, Sebastian Andrzej Siewior wrote: >> On 07/02/2015 04:26 PM, Richard Cochran wrote: >>> On Thu, Jul 02, 2015 at 09:36:22AM +0200, Sebastian Andrzej Siewior wrote: >>>> If you are in a specific SoC you could do >>>> base = of_alias_get_id(np, "gpio") * num_of_gpio_per_chip >>>> and get consistent numbers / sane. >>> >>> And what about /sys/class/gpio ? >> >> What about it? > > The poor users of that interface cannot use "of_alias_get_id" as you suggest. You do that in the driver. The only problem with that is that the synopsys controller can have between one and four banks and a bank can have 1-32 GPIOs if I remember correctly. That means you can't have a static number of GPIOs like others do. Therefore I think a starting property is the only way and I would prefer a generic one. What confuses me a little: Why is there a snps,nr-gpios property? Doesn't the snps' IP-Core expose this information? > Thanks, > Richard > Sebastian -- 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
