Messages in this thread | | | Date | Fri, 10 Jul 2015 09:27:45 -0600 | From | Stephen Warren <> | Subject | Re: [PATCH v1 1/3] gpio: defer probe if pinctrl cannot be found |
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On 07/10/2015 03:29 AM, Tomeu Vizoso wrote: > On 1 July 2015 at 19:36, Rob Herring <robherring2@gmail.com> wrote: >> On Wed, Jul 1, 2015 at 7:45 AM, Tomeu Vizoso <tomeu.vizoso@collabora.com> wrote: >>> When an OF node has a pin range for its GPIOs, return -EPROBE_DEFER if >>> the pin controller isn't available. >>> >>> Otherwise, the GPIO range wouldn't be set at all unless the pin >>> controller probed always before the GPIO chip. >>> >>> With this change, the probe of the GPIO chip will be deferred and will >>> be retried at a later point, hopefully once the pin controller has been >>> registered and probed already. >> >> This will break cases where the pinctrl driver does not exist, but the >> DT contains pinctrl bindings. We can have similar problems already >> with clocks though. However, IMO this problem is a bit different in >> that pinctrl is more likely entirely optional while clocks are often >> required. You may do all pin setup in bootloader/firmware on some >> boards and not others. Of course then why put pinctrl in the DT in >> that case? They could be present just due to how chip vs. board dts >> files are structured. > > I see. My instinct tells me that it would be better if the gpio-ranges > property was set in the board dts, but I don't really know what each > mach does with its DTSs.
That doesn't make sense; the mapping between GPIO controller pins and pin controller pins is a property of the SoC not the board.
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