On Thu, Mar 05, 2015 at 07:35:32PM +0200, Daniel Baluta wrote: > Is it possible to use regmap_update_bits to update the values > of some bits in a write only register?
That should work. > I was hoping that by filling the .reg_defaults field of regmap_config > the regmap_update_bits function will not try to read the register > from hardware. > Instead I think first call of regmap_update_bits will try to read the register > from hardware, but this fails with -EIO because the register is marked as > write only. > Am I doing something wrong? Probably, or there's a bug. What should happen is that if the register default appeared successfully then the read will get statisfied from the cache in the manner you describe - presumably that's gone wrong somehow. Have you set num_reg_defaults? That's the obvious thing...
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