[PATCH v2] iio: sx9310: Prefer async probe

[Douglas Anderson]

On one board I found that:
  probe of 5-0028 returned 1 after 259547 usecs

While some of this time is attributable to the pile of i2c transfers
that we do at probe time, the lion's share (over 200 ms) is sitting
waiting in the polling loop in sx9310_init_compensation() waiting for
the hardware to indicate that it's done.

There's no reason to block probe of all other devices on our probe.
Turn on async probe.

Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---

Changes in v2:
- Updated commit message w/ details on why probe is slow.
- Added comment next to flag about why probe is slow.

 drivers/iio/proximity/sx9310.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 9d72d08ab9e7..6d3f4ab8c6b2 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -1056,6 +1056,13 @@ static struct i2c_driver sx9310_driver = {
 		.acpi_match_table = sx9310_acpi_match,
 		.of_match_table = sx9310_of_match,
 		.pm = &sx9310_pm_ops,
+
+		/*
+		 * Lots of i2c transfers in probe + over 200 ms waiting in
+		 * sx9310_init_compensation() mean a slow probe; prefer async
+		 * so we don't delay boot if we're builtin to the kernel.
+		 */
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.probe_new	= sx9310_probe,
 	.id_table	= sx9310_id,
-- 
2.28.0.402.g5ffc5be6b7-goog