On Tuesday 15 December 2015 09:17:00 Timur Tabi wrote:

Arnd Bergmann wrote:

quoted

We generally want to use readl/writel rather than the relaxed versions,
unless it is in performance-critical code.

What about if we have 20+ writes in a row, for example, when 
initializing a part?  I've seen code like this:

        writel_relaxed(...);
        writel_relaxed(...);
        writel_relaxed(...);
        ...
        writel(...); // HW now inited, so enable

If that's in the probe() called from it function, just use writel() everywhere,
a few extra microseconds won't kill the boot time. In general, if a user would
notice the difference, use the relaxed version and add a comment to explain
how you proved it's correct, otherwise stay with the default accessors.

	Arnd