linux-kernel - [PATCH v2] mfd: da9063: occupy second I2C address, too

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Message-ID: <20251007154016.25896-2-wsa+renesas@sang-engineering.com>
Date: Tue,  7 Oct 2025 17:40:06 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: linux-renesas-soc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Peter Rosin <peda@...ntia.se>,
	Bartosz Golaszewski <bgolaszewski@...libre.com>,
	Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
	Support Opensource <support.opensource@...semi.com>,
	Lee Jones <lee@...nel.org>
Subject: [PATCH v2] mfd: da9063: occupy second I2C address, too

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 <wsa+renesas@...g-engineering.com>
Reviewed-by: Peter Rosin <peda@...ntia.se>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
---

Change since v1: reworded commit message

 drivers/mfd/da9063-i2c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mfd/da9063-i2c.c b/drivers/mfd/da9063-i2c.c
index 1ec9ab56442d..12f3dd927aba 100644
--- a/drivers/mfd/da9063-i2c.c
+++ b/drivers/mfd/da9063-i2c.c
@@ -469,6 +469,8 @@ static int da9063_i2c_probe(struct i2c_client *i2c)
 		}
 	}
 
+	devm_i2c_new_dummy_device(&i2c->dev, i2c->adapter, i2c->addr + 1);
+
 	return da9063_device_init(da9063, i2c->irq);
 }
 
-- 
2.47.2