From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 3C5A41CDA18; Wed, 4 Sep 2024 09:36:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725442583; cv=none; b=WZFHoXFafE7BQxIUYy7k88tLNtA7qFXjnisHuSDrPFj834s3db6Fq0mNtNnV4QIA4qpgCC3YEysIuioeToG+BP5LO+Gh0lnbSGE+IZx55shVxEgpVr5C0dtwu9UBXefxjUHwios5eHeSIKtQNXsYwyHpqmZuhbMa4kYPS9EnXN4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725442583; c=relaxed/simple; bh=9bAhJ9CJLtRo5g7kUHeOsxrCvaYqEyomg7XrEVlcoI0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jCa+nysnq1FX+MKi7BV0KOw/H1hCkbXCTQTe/iVunWl6xVJmTneLnbTtmT4PJ+DZBKjHJ9w7YK0y/79D9XS1URPLICRbovCkcd2g6odlgQ3gqKQe6YwmO4EeMi+8q6zhQ8nUTtQ2/IhUk3mT7t68arL/bMSWpf3Kln+cD3afD2s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZWkIiVbC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZWkIiVbC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50EBDC4CEC9; Wed, 4 Sep 2024 09:36:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725442582; bh=9bAhJ9CJLtRo5g7kUHeOsxrCvaYqEyomg7XrEVlcoI0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZWkIiVbCKmH2u8CfkCeJrYGIdpLJbYj6kBpbhH/s8NG1I5YWKI721mj7Lzt43ELUr 4Y/RWuEqQecX+uHlVulZn5bFL26l4g7DDrh/CsAUjWAD/gkxjxo5Gw8nKZgA1qUFKP ddsnw1cBv9lkrSBYrj3fXi6N7cyMOaQBad+MHS0REatztT25RnzRjXgmy3fkdN4OYe YE9QqbovUWfEnjcCfdZioSRwdtlvWWN9GveHaApRiw2JDeW47I2by+BAeP5y4eFp0+ nCxYUhP9VZeZHBJi5/yvUHifdUDcB7+hi+9ptjKGG8X2eL9sPITVHfDH+5PiTH+K7a VUusR+s9t1Q4Q== Date: Wed, 4 Sep 2024 09:36:15 +0000 From: Tzung-Bi Shih To: Stephen Boyd Cc: chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, patches@lists.linux.dev, devicetree@vger.kernel.org, Douglas Anderson , Pin-yen Lin , Andrzej Hajda , Benson Leung , Conor Dooley , Daniel Vetter , David Airlie , Dmitry Baryshkov , dri-devel@lists.freedesktop.org, Guenter Roeck , Jernej Skrabec , Jonas Karlman , Krzysztof Kozlowski , Laurent Pinchart , Lee Jones , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Prashant Malani , Robert Foss , Rob Herring , Thomas Zimmermann , Alexandre Belloni , Andy Shevchenko , Daniel Scally , Greg Kroah-Hartman , Heikki Krogerus , Ivan Orlov , linux-acpi@vger.kernel.org, linux-usb@vger.kernel.org, Mika Westerberg , "Rafael J . Wysocki" , Sakari Ailus , Vinod Koul Subject: Re: [PATCH v4 17/18] platform/chrome: cros_ec_typec: Support DP muxing Message-ID: References: <20240901040658.157425-1-swboyd@chromium.org> <20240901040658.157425-18-swboyd@chromium.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240901040658.157425-18-swboyd@chromium.org> On Sat, Aug 31, 2024 at 09:06:55PM -0700, Stephen Boyd wrote: > Most ARM based chromebooks with two usb-c-connector nodes and one DP > controller are muxing the DP lanes between the two USB ports. This is > done so that the type-c ports are at least equal in capability if not > functionality. Either an analog mux is used to steer the DP signal to > one or the other port, or a DP bridge chip has two lanes (e.g. DP > ML0/ML1) wired to one type-c port while the other two (e.g. DP ML2/ML3) > are wired to another type-c port. > > [...] > > Cc: Prashant Malani > Cc: Benson Leung > Cc: Tzung-Bi Shih > Cc: > Cc: Pin-yen Lin > Signed-off-by: Stephen Boyd Reviewed-by: Tzung-Bi Shih