On Wed, Nov 23, 2022 at 07:42:24PM +0200, Andy Shevchenko wrote: > On Tue, Nov 22, 2022 at 02:11:03AM -0500, William Breathitt Gray wrote: > > +/** > > + * struct i8255_regmap_config - Configuration for the register map of an i8255 > > + * @parent: parent device > > + * @map: regmap for the i8255 > > + * @num_ppi: number of i8255 Programmable Peripheral Interface > > + * @names: (optional) array of names for gpios > > + * @domain: (optional) IRQ domain if the controller is interrupt-capable > > > + * Note: The regmap is expected to have cache enabled and i8255 control > > + * registers not marked as volatile. > > Have you considered to catch wrong configurations by BUILD_BUG_ON() / > static_assert() / another means of validation? Ideally, I'd like to check for these configurations, but struct regmap is an opaque type (the definition is in drivers/base/regmap/internal.h). Do you know if there is some way to query a struct regmap for whether a particular register has cache enabled or is marked as volatile? William Breathitt Gray
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