This is a note to let you know that I've just added the patch titled

iio: accel: adxl367: fix DEVID read after reset

to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 1b926914bbe4e30cb32f268893ef7d82a85275b8 Mon Sep 17 00:00:00 2001 From: Cosmin Tanislav demonsingur@gmail.com Date: Wed, 7 Feb 2024 05:36:50 +0200 Subject: iio: accel: adxl367: fix DEVID read after reset

regmap_read_poll_timeout() will not sleep before reading, causing the first read to return -ENXIO on I2C, since the chip does not respond to it while it is being reset.

The datasheet specifies that a soft reset operation has a latency of 7.5ms.

Add a 15ms sleep between reset and reading the DEVID register, and switch to a simple regmap_read() call.

Fixes: cbab791c5e2a ("iio: accel: add ADXL367 driver") Signed-off-by: Cosmin Tanislav demonsingur@gmail.com Reviewed-by: Nuno Sa nuno.sa@analog.com Link: https://lore.kernel.org/r/20240207033657.206171-1-demonsingur@gmail.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/accel/adxl367.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/accel/adxl367.c b/drivers/iio/accel/adxl367.c index 90b7ae6d42b7..484fe2e9fb17 100644 --- a/drivers/iio/accel/adxl367.c +++ b/drivers/iio/accel/adxl367.c @@ -1429,9 +1429,11 @@ static int adxl367_verify_devid(struct adxl367_state *st) unsigned int val; int ret;

- ret = regmap_read_poll_timeout(st->regmap, ADXL367_REG_DEVID, val, - val == ADXL367_DEVID_AD, 1000, 10000); + ret = regmap_read(st->regmap, ADXL367_REG_DEVID, &val); if (ret) + return dev_err_probe(st->dev, ret, "Failed to read dev id\n"); + + if (val != ADXL367_DEVID_AD) return dev_err_probe(st->dev, -ENODEV, "Invalid dev id 0x%02X, expected 0x%02X\n", val, ADXL367_DEVID_AD); @@ -1510,6 +1512,8 @@ int adxl367_probe(struct device *dev, const struct adxl367_ops *ops, if (ret) return ret;

+ fsleep(15000); + ret = adxl367_verify_devid(st); if (ret) return ret;