Re: [PATCH RFC 2/3] rust: Add bindings for device properties

[Rob Herring]

On Tue, Oct 29, 2024 at 2:35 PM Rob Herring <robh@xxxxxxxxxx> wrote:
>
> On Tue, Oct 29, 2024 at 1:57 PM Miguel Ojeda
> <miguel.ojeda.sandonis@xxxxxxxxx> wrote:
> >
> > On Tue, Oct 29, 2024 at 7:48 PM Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote:
> > >
> > > One option is to define a trait for integers:
>
> Yeah, but that doesn't feel like something I should do here. I imagine
> other things might need the same thing. Perhaps the bindings for
> readb/readw/readl for example. And essentially the crate:num already
> has the trait I need. Shouldn't the kernel mirror that? I recall
> seeing some topic of including crates in the kernel?

Looking a bit closer at FromBytes, that's almost what I need. I'm not
worried if it also includes usize and isize. However, since the trait
also is provided for arrays/slices, the following happens to work:

let prop: [i16; 4] = dev.property_read(c_str!("test,i16-array"))?;

Which is a typo meant to be:

let prop: [i16; 4] = dev.property_read_array(c_str!("test,i16-array"))?;

And it doesn't really work. It reads all the data, but reads it as a
u64 (DT data is BE), so the order is wrong.

And now my dreams of "if it compiles, it works" are shattered. ;)

Rob