[PATCH 6.6.y] iio: imu: inv_icm42600: fix spi burst write not supported

inv.git-commit
2025-01-13T13:29:09Z

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

Burst write with SPI is not working for all icm42600 chips. It was
only used for setting user offsets with regmap_bulk_write.

Add specific SPI regmap config for using only single write with SPI.

Fixes: 9f9ff91b775b ("iio: imu: inv_icm42600: add SPI driver for inv_icm42600 driver")
Cc: stable@vger.kernel.org
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Link: https://patch.msgid.link/20241112-inv-icm42600-fix-spi-burst-write-not-supported-v2-1-97690dc03607@tdk.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
(cherry picked from commit c0f866de4ce447bca3191b9cefac60c4b36a7922)
---
drivers/iio/imu/inv_icm42600/inv_icm42600.h | 1 +
drivers/iio/imu/inv_icm42600/inv_icm42600_core.c | 15 +++++++++++++++
drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c | 3 ++-
3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600.h b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
index 0e290c807b0f..94c0eb0bf874 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600.h
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
@@ -362,6 +362,7 @@ struct inv_icm42600_state {
typedef int (*inv_icm42600_bus_setup)(struct inv_icm42600_state *);

extern const struct regmap_config inv_icm42600_regmap_config;
+extern const struct regmap_config inv_icm42600_spi_regmap_config;
extern const struct dev_pm_ops inv_icm42600_pm_ops;

const struct iio_mount_matrix *
diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
index a5e81906e37e..04b006d71526 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c
@@ -43,6 +43,21 @@ const struct regmap_config inv_icm42600_regmap_config = {
};
EXPORT_SYMBOL_NS_GPL(inv_icm42600_regmap_config, IIO_ICM42600);

+/* define specific regmap for SPI not supporting burst write */
+const struct regmap_config inv_icm42600_spi_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,
+ .use_single_write = true,
+};
+EXPORT_SYMBOL_NS_GPL(inv_icm42600_spi_regmap_config, "IIO_ICM42600");
+
struct inv_icm42600_hw {
uint8_t whoami;
const char *name;
diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
index 6be4ac794937..abfa1b73cf4d 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
@@ -59,7 +59,8 @@ static int inv_icm42600_probe(struct spi_device *spi)
return -EINVAL;
chip = (uintptr_t)match;

- regmap = devm_regmap_init_spi(spi, &inv_icm42600_regmap_config);
+ /* use SPI specific regmap */
+ regmap = devm_regmap_init_spi(spi, &inv_icm42600_spi_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);

--
2.25.1