From 4cd56dbd764e27468c7115575ac200c284406439 Mon Sep 17 00:00:00 2001 From: Matti Vaittinen Date: Thu, 4 May 2023 10:57:13 +0300 Subject: [PATCH] iio: bu27034: Probe asynchronously Devices which may take a while to initialize during probe and which have no strong reason to probe synchronously can request asynchronous probing as default probe strategy. This can speed-up start times on some platforms. The BU27034 gets probe delayed for at least two reasons. It enables the supply regulator, (which is likely to have ramp-up delay if it was disabled) and additionally it delays while the sensor itself is initializing. Changing to asynchronous probing may cause problems. Some of which are discussed in: https://lore.kernel.org/all/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk/ Enabling async probing for the ROHM BU27034 should be fairly safe to try though as there is no in-tree users for it yet. If the async probing appears to be an issue we can switch easily back to synchronous (or better yet, fix the actual problem). Enable asynchronous probing for BU27034. Signed-off-by: Matti Vaittinen Link: https://lore.kernel.org/r/e7088793e1868c77b1894b30cd026e8ed043ea7c.1683185765.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron --- drivers/iio/light/rohm-bu27034.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iio/light/rohm-bu27034.c b/drivers/iio/light/rohm-bu27034.c index e486dcf..4035c06 100644 --- a/drivers/iio/light/rohm-bu27034.c +++ b/drivers/iio/light/rohm-bu27034.c @@ -1486,6 +1486,7 @@ static struct i2c_driver bu27034_i2c_driver = { .driver = { .name = "bu27034-als", .of_match_table = bu27034_of_match, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, .probe_new = bu27034_probe, }; -- 2.7.4