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 AFABA1F236B for ; Thu, 3 Apr 2025 09:09:31 +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=1743671374; cv=none; b=twyAN99vDlquWwAIXRbZW6i+M8p2WVE4abazNs2QZ6BdFnjYO6pXJwrE2V02sgZaIKwhEC1sGEfk4J2O8KKK1+0mbnCu9GdULK8WrNyNQ45qXIel4AvE0N/lrGL9FuhEhxPJhz4X5GweFqIwAm45A/IhW72MlECdiN186SISTqM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743671374; c=relaxed/simple; bh=i28Ur6D4dFksz1V6tHcoVDYKKTu8sjypXRVvZ23xK5A=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Y0+qY3Nr3le93M5JXTiMFwZMNvdbXGyY0fTipB43EHpFObZJQHJIrSho87d2tcbTzKE9udCC5QizShishq5ARXBVwSw1EcEmk/tS+f1Msu0rMfObjsufnIiNVWwu1Q2dIv9eEVrSCdJnO8Bvknap+1qc3wNT4EKRqE1yqN0aQok= 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=SPJ966d0; 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="SPJ966d0" 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=i28U r6D4dFksz1V6tHcoVDYKKTu8sjypXRVvZ23xK5A=; b=SPJ966d0tJhl1UyS+XV8 SUp8MMf3JS3m5QxsKp/wv9Va3ChGXWHunos0Yo5p53CVqy2lnKtdO1GzQEzMyAJp lUe6dDIZ/4fn+Y5J0WaNeqP7zW+E3b+T8hkEMorK7qr1u79DrlVxgSKur8G4EWcC onCqzOU2Yfcx05+flpsCCd2vBKNhydM9uf2HAhUw0YQpWO0otO8NZYUcsX2oa6gg JGzGvZF0oub/nKYWAZovKhGN/RdeJ7m3H0WlQ2RIohF8i/MtvK0LkNoGfCmcOnlJ PC+///e3fHTUbcFPheAWRMkdhMCDOxkIJj+nDlPRCwBuVfLV5RLZThLiYIXBV7E2 rg== Received: (qmail 2313138 invoked from network); 3 Apr 2025 11:09:29 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 3 Apr 2025 11:09:29 +0200 X-UD-Smtp-Session: l3s3148p1@ruKSINwxXJ4gAwDPXwaqAEtIN5mYkFJw Date: Thu, 3 Apr 2025 11:09:29 +0200 From: Wolfram Sang To: Herve Codina Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Luca Ceresoli , Thomas Petazzoni Subject: Re: [RFC PATCH 3/3] i2c: i2c-core-of: Handle i2c bus extensions Message-ID: Mail-Followup-To: Wolfram Sang , Herve Codina , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Luca Ceresoli , Thomas Petazzoni References: <20250205173918.600037-1-herve.codina@bootlin.com> <20250205173918.600037-4-herve.codina@bootlin.com> Precedence: bulk X-Mailing-List: devicetree@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="DA2ygZZVAeF7cHkv" Content-Disposition: inline In-Reply-To: <20250205173918.600037-4-herve.codina@bootlin.com> --DA2ygZZVAeF7cHkv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Feb 05, 2025 at 06:39:16PM +0100, Herve Codina wrote: > i2c bus extensions were introduced to decouple i2c busses when they are > wired to connectors. Combined with devicetree overlays, they introduce > an additional level of indirection, which is needed to decouple the > overlay (describing the hardware available on addon baord) and the base > tree (describing resources provided to the addon board). 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