On 12/12/2017 05:07 AM, Andy Shevchenko wrote:
Not ACPI standards as of my knowledge. ACPI standard defines a common scheme how to define properties, it doesn't tell anything about property names or any mappings between names to values or names to "OS subsystem").
There was an attempt a while back to standardize this like we do for device tree, but it fell apart. Device-specific ACPI-only properties are not standarized. This driver is initialized only on ACPI systems. It has no device tree binding.
As for GPIO we just follow *de facto* what DT has right now, i.e. "xxx- gpio" or "xxx-gpios" pattern is used to map ACPI standard resource to a GPIO name. That's how GPIO ACPI lib is being developed.
GPIOs in device tree are defined completely differently than in ACPI. On DT, the kernel controls the pin muxing. On ACPI, pins are muxed by firmware and never re-muxed by the operating system. So all this driver does is expose a few pins as simple GPIOs.
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