From mboxrd@z Thu Jan 1 00:00:00 1970 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 E9F011898F8 for ; Sun, 19 Oct 2025 17:54:07 +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=1760896452; cv=none; b=WvY0fKt9TbsNDFY7p6YkaoqQBF5z0WgMDOlt5I9yfK3ZOnD4ed9YTlPwDlAsfFc0mU+HO65+QFx+0i416I3Rae57s58eOJTyeIpwdElzyqYZ4cB8/HLqraYM+3ICgtviqRVaCfxKtrHGnXNfPPFTXAZw/J2HNJDOKAf/GQUOZc8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760896452; c=relaxed/simple; bh=LPohAfeHNfFHsaU2R0CVXTA/hDYzjMX9mjmN09Okbnw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BhHD5GcG3nb3RLATLdH5lFlKBbDCNAhjqfrCPS284JkdFsR/31WXC8MXlXwVZ9MVXPvbXuS6bJu4FBTb1c7PuhEz9Srb/RB9ZyM3zo3HrWArsNhqKwJX5bAg5KwPtCrEBBRjWT45/YI/Khf4h/GKP+A3yFIRnAaEeaR05/5VCUQ= 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=diNszh8Y; 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="diNszh8Y" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to; s=k1; bh=LPoh AfeHNfFHsaU2R0CVXTA/hDYzjMX9mjmN09Okbnw=; b=diNszh8YI/El7YX7KzVx 0X5XMaj6L1E/jBkzRaV0f+rtcd7l2t6oIfW9yEHcifX8FVEmJkheG0+vxPBclgyd 1nvVFeTTrt4YEerVsdj+NjuUJedf5ftI5GwNMRdWcLpb3FQaGwtJSmjQ9bA/mvlJ Pj8GTZ2vWaxREGTcgfDkS6L8PZMX2y8WVhkA4aaE0VgedMa+u5e74MAj72wGkNOW maQ9aYhPP+z6ZNYehc+KIZZVmT8jD8faPikNlmmwFs72oqAjVWwZofZZyabxFjzj tF/qB8lAVSq5mBPi7iLCPAzO3yJJLcr7gwKiqeCHh4Gq+O5xTrxvmGP1dimpwY5G zg== Received: (qmail 768932 invoked from network); 19 Oct 2025 19:53:59 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 19 Oct 2025 19:53:59 +0200 X-UD-Smtp-Session: l3s3148p1@Ze6zpoZBwNMgAwDNf0EaAGfWvYNrcrsi Date: Sun, 19 Oct 2025 19:53:58 +0200 From: Wolfram Sang To: Andy Shevchenko Cc: Hans Verkuil , linux-i2c@vger.kernel.org, Jarkko Nikula , Mika Westerberg , Jan Dabros , Andi Shyti Subject: Re: i2c-designware: not possible to write to different i2c addresses in one transfer? Message-ID: References: Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="RwZ4ECJsfbDUhUw1" Content-Disposition: inline In-Reply-To: --RwZ4ECJsfbDUhUw1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > May I ask a dumb question? Why do we need such an awkward transaction > to begin with? Because it is allowed per I2C specs? So people will use it. Interestingly, a patch has just now been proposed which I haven't looked at but I wanted to let you guys already know: [PATCH 2/3] i2c: designware: Enable transfer with different target addresses https://lore.kernel.org/r/20251017-i2c-dw-v1-2-7b85b71c7a87@bootlin.com Maybe you guys can have a look at it? --RwZ4ECJsfbDUhUw1 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmj1JbIACgkQFA3kzBSg KbaTow/9F3rHsCfTudGQtoiCurSy35+Z5D4UzmJBstT6JTZtahePRnSROWTGXXHr ddGnKougjTmQ+rDp9fqhr9NuP3n0FuWFBklEkCoD3v5Dk619jzz1v2WRGdZk1yYy knmDwb4aL933qPFthqFSfn6AnO6kmGyIKVvB7lZdhaDpsgxN1cdqLcmfPKat1bB1 aMn/pKiimZLkNR2tR766SMwlFAeYP8OZOrX8Q1wjgqj+zEiqsqeORUhBTHrpgBxi wpAM9LwCtm5j0wEq1pLNIzeXV+K+TFsXjQtSNU7BLi4fxOT+w5qZoBWUqOH2HN7K 1wRbDwxSM2RyMnoZXh9PvxU4c0YSC5OSF63kniUdIbjwl1RVHhH+fmS3NIW/LZLh RBk8MDe6TcWzovgidFZuLpH03APwQ1R+/8EsmHJo9EBN+kdqku7eHpHdLDVJeoFc sWBPvaDq7Tb15U0CaPg6b0i/rANAkF7aV1ICOoGNKCUQrRxmSLLwxols/jVJHzrR l9bKKlmcUpcBUJl4ytKV0PrJloJoT4tU28y37E3IbAPripvlVzXrfoiG76WSWJ7v EwTVnL3wp3bVVBnQT3IpjoH2iMHO1OFFhWXL4f2M42eIvG9gP2CLd9DV6rXaokcO srqMqBihOZb7x7Qmn+rSsa4sz3qEqpqjd02+8Tlf77cJ1KaB0rE= =VrDH -----END PGP SIGNATURE----- --RwZ4ECJsfbDUhUw1--