commit: http://blackfin.uclinux.org/git/?p=linux-kernel;a=commitdiff;h=3050daa5a28c2571399e0dc60f6559794a7e5c01 branch: http://blackfin.uclinux.org/git/?p=linux-kernel;a=shortlog;h=refs/heads/2011R1
Some devices are sensitive to reads on their registers, especially for things like clear on read interrupt status registers. Avoid creating problems with these with things like debugfs by allowing drivers to tell the core about them. If a register is marked as precious then the core will not internally generate any reads of it. Signed-off-by: Mark Brown <[email protected]> --- include/linux/regmap.h | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/include/linux/regmap.h b/include/linux/regmap.h index aef2b36..c878a4b 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -33,6 +33,9 @@ struct spi_device; * can be read from. * @volatile_register: Optional callback returning true if the register * value can't be cached. + * @precious_register: Optional callback returning true if the rgister + * should not be read outside of a call from the driver + * (eg, a clear on read interrupt status register). */ struct regmap_config { int reg_bits; @@ -42,6 +45,7 @@ struct regmap_config { bool (*writeable_reg)(struct device *dev, unsigned int reg); bool (*readable_reg)(struct device *dev, unsigned int reg); bool (*volatile_reg)(struct device *dev, unsigned int reg); + bool (*precious_reg)(struct device *dev, unsigned int reg); }; typedef int (*regmap_hw_write)(struct device *dev, const void *data,
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