Commit 50cfe81b authored by Jean-Baptiste Maneyrol's avatar Jean-Baptiste Maneyrol Committed by Jonathan Cameron
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iio: imu: inv_icm42600: add register caching in the regmap 



Register caching is improving bus access a lot because of the register
window bank setting. Previously, bank register was set for every
register access. Now with caching, it happens only when changing bank
which is very infrequent.

Signed-off-by: default avatarJean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://lore.kernel.org/r/20240607081039.789079-1-inv.git-commit@tdk.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent bf977499

drivers/iio/imu/inv_icm42600/inv_icm42600_core.c

+44 −0
Original line number Diff line number Diff line
@@ -34,12 +34,56 @@ static const struct regmap_range_cfg inv_icm42600_regmap_ranges[] = { 
	},

};



static const struct regmap_range inv_icm42600_regmap_volatile_yes_ranges[] = {

	/* Sensor data registers */

	regmap_reg_range(0x001D, 0x002A),

	/* INT status, FIFO, APEX data */

	regmap_reg_range(0x002D, 0x0038),

	/* Signal path reset */

	regmap_reg_range(0x004B, 0x004B),

	/* FIFO lost packets */

	regmap_reg_range(0x006C, 0x006D),

	/* Timestamp value */

	regmap_reg_range(0x1062, 0x1064),

};



static const struct regmap_range inv_icm42600_regmap_volatile_no_ranges[] = {

	regmap_reg_range(0x0000, 0x001C),

	regmap_reg_range(0x006E, 0x1061),

	regmap_reg_range(0x1065, 0x4FFF),

};



static const struct regmap_access_table inv_icm42600_regmap_volatile_accesses[] = {

	{

		.yes_ranges = inv_icm42600_regmap_volatile_yes_ranges,

		.n_yes_ranges = ARRAY_SIZE(inv_icm42600_regmap_volatile_yes_ranges),

		.no_ranges = inv_icm42600_regmap_volatile_no_ranges,

		.n_no_ranges = ARRAY_SIZE(inv_icm42600_regmap_volatile_no_ranges),

	},

};



static const struct regmap_range inv_icm42600_regmap_rd_noinc_no_ranges[] = {

	regmap_reg_range(0x0000, INV_ICM42600_REG_FIFO_DATA - 1),

	regmap_reg_range(INV_ICM42600_REG_FIFO_DATA + 1, 0x4FFF),

};



static const struct regmap_access_table inv_icm42600_regmap_rd_noinc_accesses[] = {

	{

		.no_ranges = inv_icm42600_regmap_rd_noinc_no_ranges,

		.n_no_ranges = ARRAY_SIZE(inv_icm42600_regmap_rd_noinc_no_ranges),

	},

};



const struct regmap_config inv_icm42600_regmap_config = {

	.name = "inv_icm42600",

	.reg_bits = 8,

	.val_bits = 8,

	.max_register = 0x4FFF,

	.ranges = inv_icm42600_regmap_ranges,

	.num_ranges = ARRAY_SIZE(inv_icm42600_regmap_ranges),

	.volatile_table = inv_icm42600_regmap_volatile_accesses,

	.rd_noinc_table = inv_icm42600_regmap_rd_noinc_accesses,

	.cache_type = REGCACHE_RBTREE,

};

EXPORT_SYMBOL_NS_GPL(inv_icm42600_regmap_config, IIO_ICM42600);