[U-Boot] [PATCH v2 1/9] sunxi: initial sun7i clocks and timer support.

[Marek Vasut]

On Thursday, March 27, 2014 at 10:29:56 PM, Ian Campbell wrote:
> On Mon, 2014-03-24 at 21:52 +0100, Marek Vasut wrote:
> > > +static struct sunxi_timer *timer_base =
> > > +     &((struct sunxi_timer_reg *)SUNXI_TIMER_BASE)->timer[TIMER_NUM];
> > > +
> > > +/* macro to read the 32 bit timer: since it decrements, we invert read
> > > value */ +#define READ_TIMER() (~readl(&timer_base->val))
> > 
> > This macro has to go, just use ~readl() in place. But still, why do you
> > use that negation in "~readl()" anyway ?
> 
> The comment right above it explains why: the timer counts backwards and
> inverting it accounts for that.
> 
> This is subtle enough that I don't think using ~readl() in place in the
> 3 callers would be an improvement.

Please do it, we don't want any implementers down the line using this 
"READ_TIMER()" call and getting hit by "timer_base undefined" . That macro hides 
the dependency on this symbol, while if you expanded it in-place, the dependency 
would be explicit. I really do want to see that macro gone, sorry.

Best regards,
Marek Vasut