Re: [PATCH 07/50] staging: omap-thermal: introduce RMW_BITS macro
From: Dan Carpenter
Date: Sat Mar 16 2013 - 10:00:57 EST
On Sat, Mar 16, 2013 at 08:36:51AM -0400, Eduardo Valentin wrote:
> >But that said, I don't care for the RMW_BITS() very much as a long
> >term thing. If we just used pointers instead of passing the offset
> >into the bg_ptr->conf->sensors array then everything would be a
> >lot cleaner.
> >In other words, instead of this:
> >static u32 omap_bandgap_read_temp(struct omap_bandgap *bg_ptr, int id)
> >We would have:
> >static u32 omap_bandgap_read_temp(struct omap_bandgap *bg_ptr,
> > struct temp_sensor_registers *tsr)
> I see. That will require a change in the whole driver though. If you
> see, the driver as of today uses the former approach, not only for
> read_temp or rmw_bits.
> >If you have the pointer then it's easy write RMW_BITS() as a
> >static void rmw_bits(struct omap_bandgap *bg_ptr, u32 reg, u32 mask, u32 val)
> > u32 r;
> > r = omap_bandgap_readl(bg_ptr, reg);
> > r &= ~mask;
> > r |= val << __ffs(mask);
> > omap_bandgap_writel(bg_ptr, r, reg);
> >It's called like:
> > rmw_bits(bg_ptr, tsr->bgap_mask_ctrl, tsr->mask_freeze_mask, 1);
> This is nice, but it will require fetching tsr from .conf before
> every call o rmw_bits. And for that you need the sensor index.
No. I'm suggesting that you re-write the driver to pass the tsr
pointer directly instead of the index.
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