On Fri, 20 Dec 2013, Tero Kristo wrote: > On 12/20/2013 01:00 PM, Paul Walmsley wrote: > > On Thu, 19 Dec 2013, Tero Kristo wrote: > > > +/** > > > + * clk_readl_default - default clock register read support function > > > + * @reg: register to read > > > + * > > > + * Default implementation for reading a clock register. > > > + */ > > > +static u32 clk_readl_default(u32 __iomem *reg) > > > > Why u32 __iomem rather than void *? Not that this will affect OMAP, but > > will this need to be changed later to support 64-bit addresses? > > __raw_writel() and __raw_readl() are defined with "void __iomem *" as > > their address argument, which will be 64 bits on arm64, correct? > > Just copy pasting the current implementation from the clk-provider.h file. > > However, pointer is pointer no? This is just used to refer to a 32bit value, > the pointer itself can be either 32bit or 64bit. Yes I think you're right that the impact is simply cosmetic. That argument winds up as the address argument to __raw_readl/writel() which is a void __iomem *, so the type there will be ignored. > If the registers are changed to be 64 bit though.... but that will > require changing most of the clock code as it is littered with 'u32 > val;' type declarations. Yes, we can count on readl/writel to operate on 32-bit values. > Anyway, I can change this to be void __iomem. OK - Paul -- 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
