From nobody Mon Feb 9 04:44:37 2026 Received: from mail.zeus03.de (zeus03.de [194.117.254.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 33CC229BD87 for ; Thu, 23 Oct 2025 06:56:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=194.117.254.33 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761202584; cv=none; b=XbPj90+pqReGtTRSIUPm1dYDRFyafMpi7FDeTO7ReosSRxhTT45HYAHJGlIvlan6X62eZP0bxfB6KrCgeRDmRfty1YPfoI0VbAAV0mcuS3iYYn843VLaEjuI1z8NO9Yt0IY7gtGdlaA9Tpnn/aRcAmJv35i13Bqz+Cp0zBDGLIY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761202584; c=relaxed/simple; bh=Gjd8j2/DIwjkc0A/jP6a2ujhrsI7hHy2Hy/bJ0HdPHI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lNkCGT434peLD27LK68G2WhymnBQq4Hwdu4am6XNZljH6cH8qgGKzP1YkRPXVa+/hRrdOFgpK0yQKJTJdke7AXG+tzmk5ZN1XvDS6EczErn8VjboXLoGRykOb/Q2H5OZu2KmIS1SXayV3O58RSJXUBve9KWMQXR2o39mWB4pk4A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com; spf=pass smtp.mailfrom=sang-engineering.com; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b=jymTsv0p; arc=none smtp.client-ip=194.117.254.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b="jymTsv0p" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; s=k1; bh=L7woAfdKTTz32O hWPBwBTKEj4mFzE3FP4tRQ+CWXn44=; b=jymTsv0pb4ks33zEq/NTTmpCCxVhL5 2io4mPNESfC2x6oGYAvOxJeeP1GF0Kr6X2xBlz3Wa1onubmv4q166jpRtjhxsy3g tJduXQPCob3KQqWB10TkqCdTD6v9YljaU2atCu06EVyvfpcSBgn+FqQHwdfrjW0T hArroO3WeIUvhIYvIhmifnB6PJukdPoj6ljxk8WoarhmVc1KXE74uLu2+vMc5p99 nkJfkzN41uCCEkFI1l+EJa/a4UYwN8xcy0aG2gvz0Kske6KjBRjmA0jwlv+TqSdO rLMELp/u5jcewRrz0sjG2LZnOyrabXpYmBvFT5TYt6UeBDLeFAM8thwA== Received: (qmail 2097683 invoked from network); 23 Oct 2025 08:56:18 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 23 Oct 2025 08:56:18 +0200 X-UD-Smtp-Session: l3s3148p1@36sI7s1B3V5tKPAY From: Wolfram Sang To: linux-renesas-soc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Wolfram Sang , Peter Rosin , Bartosz Golaszewski , Kieran Bingham , Support Opensource , Lee Jones Subject: [PATCH v3] mfd: da9063: occupy second I2C address, too Date: Thu, 23 Oct 2025 08:55:59 +0200 Message-ID: <20251023065610.2855-2-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.47.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- Change since v2: add comment in the code as well 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 1ec9ab56442d..a803b7440f09 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) } } =20 + /* 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); } =20 --=20 2.47.2