From edc9ae420f98dd094e47f8b2d33652858bdc830b Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Mon, 9 Apr 2012 13:40:24 -0600 Subject: regmap: implement register striding regmap_config.reg_stride is introduced. All extant register addresses are a multiple of this value. Users of serial-oriented regmap busses will typically set this to 1. Users of the MMIO regmap bus will typically set this based on the value size of their registers, in bytes, so 4 for a 32-bit register. Throughout the regmap code, actual register addresses are used. Wherever the register address is used to index some array of values, the address is divided by the stride to determine the index, or vice-versa. Error- checking is added to all entry-points for register address data to ensure that register addresses actually satisfy the specified stride. The MMIO bus ensures that the specified stride is large enough for the register size. Signed-off-by: Stephen Warren Signed-off-by: Mark Brown --- include/linux/regmap.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/regmap.h b/include/linux/regmap.h index 680ddd7de60e..0258bcd6258d 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -50,6 +50,9 @@ struct reg_default { * register regions. * * @reg_bits: Number of bits in a register address, mandatory. + * @reg_stride: The register address stride. Valid register addresses are a + * multiple of this value. If set to 0, a value of 1 will be + * used. * @pad_bits: Number of bits of padding between register and value. * @val_bits: Number of bits in a register value, mandatory. * @@ -83,6 +86,7 @@ struct regmap_config { const char *name; int reg_bits; + int reg_stride; int pad_bits; int val_bits; -- cgit v1.2.3