[PATCH] iio: imu: inv_icm42600: add register caching in the regmap

[inv.git-commit@tdk.com]

From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

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: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
---
 .../iio/imu/inv_icm42600/inv_icm42600_core.c  | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
index 8892ce34a33c..ab1740d4b50b 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
@@ -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);
 
-- 
2.34.1