From 18597dbccfa5a99ccb7278046234c0ae29ec7a19 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Thu, 23 Oct 2025 08:55:59 +0200 Subject: [PATCH] mfd: da9063: Occupy second I2C address The second address can be used as a shortcut to access register pages 2+3. The driver does not use this feature yet. The second address should still be marked as used, otherwise userspace could interfere with the driver. Signed-off-by: Wolfram Sang Reviewed-by: Peter Rosin Reviewed-by: Bartosz Golaszewski Reviewed-by: Kieran Bingham Link: https://patch.msgid.link/20251023065610.2855-2-wsa+renesas@sang-engineering.com Signed-off-by: Lee Jones --- drivers/mfd/da9063-i2c.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mfd/da9063-i2c.c b/drivers/mfd/da9063-i2c.c index 1ec9ab56442df..a803b7440f09b 100644 --- a/drivers/mfd/da9063-i2c.c +++ b/drivers/mfd/da9063-i2c.c @@ -469,6 +469,9 @@ static int da9063_i2c_probe(struct i2c_client *i2c) } } + /* Reserve our unused second address so userspace won't interfere */ + devm_i2c_new_dummy_device(&i2c->dev, i2c->adapter, i2c->addr + 1); + return da9063_device_init(da9063, i2c->irq); } -- 2.47.3