On Wed, Dec 01, 2021 at 02:11:28PM +0100, Bartosz Golaszewski wrote:
On Tue, Nov 30, 2021 at 10:04 PM Bartosz Golaszewski brgl@bgdev.pl wrote:
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Let me maybe rephrase the problem: currently, for GPIO devices instantiating multiple banks created outside of the OF or ACPI frameworks (e.g. instantiated manually and configured using a hierarchy of software nodes with a single parent swnode and a number of child swnodes representing the children), it is impossible to assign firmware nodes other than the one representing the top GPIO device to the gpiochip child devices.
In fact if we want to drop the OF APIs entirely from gpiolib - this would be the right first step as for gpio-sim it actually replaces the gc->of_node = some_of_node; assignment that OF-based drivers do for sub-nodes defining banks and it does work with device-tree (I verified that too) thanks to the fwnode abstraction layer.
In exchange of acknowledgements I confirm that I understood the issue you are describing. What I still don't like is this band-aid:ish approach. What we really need is to replace of_node by fwnode in GPIO library once for all. But it can be done later after your simulation series (or before, i.o.w. independently), hence I propose to update TODO and do it separately.