On Fri, Mar 22, 2019 at 03:53:00PM +0800, Simon Glass wrote: > Hi Thierry, > > On Fri, 22 Mar 2019 at 02:10, Thierry Reding <thierry.red...@gmail.com> wrote: > > > > From: Thierry Reding <tred...@nvidia.com> > > > > These helpers can be used to unpack variables of type fdt_addr_t and > > fdt_size_t into a pair of 32-bit variables. This is useful in cases > > where such variables need to be written to properties (such as "reg") > > of a device tree node where they need to be split into cells. > > > > Signed-off-by: Thierry Reding <tred...@nvidia.com> > > --- > > Changes in v2: > > - new patch > > > > include/fdtdec.h | 25 +++++++++++++++++++++++++ > > 1 file changed, 25 insertions(+) > > > > diff --git a/include/fdtdec.h b/include/fdtdec.h > > index a965c33157c9..a0ba57c6318b 100644 > > --- a/include/fdtdec.h > > +++ b/include/fdtdec.h > > @@ -23,6 +23,31 @@ > > */ > > typedef phys_addr_t fdt_addr_t; > > typedef phys_size_t fdt_size_t; > > + > > +static inline fdt32_t fdt_addr_unpack(fdt_addr_t addr, fdt32_t *upper) > > +{ > > + if (upper) > > +#ifdef CONFIG_PHYS_64BIT > > Could we use 'if IS_ENABLED()' instead?
Are you suggesting to use IS_ENABLED() in a preprocessor #if or a compiler if (IS_ENABLED(...)) { ... } construct? For the former, yes we could certainly do that. The latter would probably work as well if we did something like this: > > + *upper = addr >> 32; *upper = upper_32_bits(addr); where upper_32_bits() is a macro such as the one defined in Linux' include/linux/kernel.h. That prevents the right-shift of 32 bits for 32-bit quantities to not produce a warning. That said, I see that we already have that macro in U-Boot's kernel.h header file, so I could switch to using that. With that I think we could even leave out the conditional. The compiler would hopefully optimize it (the upper_32_bits() invocation) out by itself. I'll do some testing and respin if that works out. Thierry > > +#else > > + *upper = 0; > > +#endif > > + > > + return addr; > > +} > > + > > +static inline fdt32_t fdt_size_unpack(fdt_size_t size, fdt32_t *upper) > > +{ > > + if (upper) > > +#ifdef CONFIG_PHYS_64BIT > > + *upper = size >> 32; > > +#else > > + *upper = 0; > > +#endif > > + > > + return size; > > +} > > + > > #ifdef CONFIG_PHYS_64BIT > > #define FDT_ADDR_T_NONE (-1U) > > #define fdt_addr_to_cpu(reg) be64_to_cpu(reg) > > -- > > 2.21.0 > > > > Regards, > Simon
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