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a="88844040" X-IronPort-AV: E=Sophos;i="6.19,249,1754982000"; d="scan'208";a="88844040" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2025 02:44:37 -0700 X-CSE-ConnectionGUID: iLOeuevISgC6L9OMMBEeEA== X-CSE-MsgGUID: YhP6hwNSQqC/F6AV1drOTA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,249,1754982000"; d="scan'208";a="221305921" Received: from bkammerd-mobl.amr.corp.intel.com (HELO kuha.fi.intel.com) ([10.124.221.165]) by orviesa001.jf.intel.com with SMTP; 23 Oct 2025 02:44:26 -0700 Received: by kuha.fi.intel.com (sSMTP sendmail emulation); Thu, 23 Oct 2025 12:44:25 +0300 Date: Thu, 23 Oct 2025 12:44:25 +0300 From: Heikki Krogerus To: Chaoyi Chen Cc: Greg Kroah-Hartman , Dmitry Baryshkov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Kishon Vijay Abraham I , Heiko Stuebner , Sandy Huang , Andy Yan , Yubing Zhang , Frank Wang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Amit Sunil Dhamne , Chaoyi Chen , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH v7 1/9] usb: typec: Add notifier functions Message-ID: References: <20251023033009.90-1-kernel@airkyi.com> <20251023033009.90-2-kernel@airkyi.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251023_024438_535490_76E9DA74 X-CRM114-Status: GOOD ( 21.44 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On Thu, Oct 23, 2025 at 12:04:44PM +0300, Heikki Krogerus wrote: > On Thu, Oct 23, 2025 at 11:10:20AM +0300, Heikki Krogerus wrote: > > Hi, > > > > > diff --git a/include/linux/usb/typec_notify.h b/include/linux/usb/typec_notify.h > > > new file mode 100644 > > > index 000000000000..a3f1f3b3ae47 > > > --- /dev/null > > > +++ b/include/linux/usb/typec_notify.h > > > @@ -0,0 +1,17 @@ > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > + > > > +#ifndef __USB_TYPEC_NOTIFY > > > +#define __USB_TYPEC_NOTIFY > > > + > > > +#include > > > + > > > +enum usb_typec_event { > > > + TYPEC_ALTMODE_REGISTERED > > > +}; > > > > Don't you need to know when the altmode is removed? > > I noticed that you don't because drm_dp_hpd_bridge_register() is > always resource managed. But I think you could still send an event > also when the altmode is removed already now. That way it does not > need to be separately added if and when it is needed. Hold on! Every bus has already a notifier chain. That's the one that we should also use. Sorry for not noticing that earlier. So let's just export the bus type in this patch - you can then use bus_register_notifier() in your driver: diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c index a884cec9ab7e..65ded9e3cdaa 100644 --- a/drivers/usb/typec/bus.c +++ b/drivers/usb/typec/bus.c @@ -547,3 +547,4 @@ const struct bus_type typec_bus = { .probe = typec_probe, .remove = typec_remove, }; +EXPORT_SYMBOL_GPL(typec_bus); diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h index 643b8c81786d..af9edb3db9d0 100644 --- a/drivers/usb/typec/bus.h +++ b/drivers/usb/typec/bus.h @@ -5,7 +5,6 @@ #include -struct bus_type; struct typec_mux; struct typec_retimer; @@ -28,7 +27,6 @@ struct altmode { #define to_altmode(d) container_of(d, struct altmode, adev) -extern const struct bus_type typec_bus; extern const struct device_type typec_altmode_dev_type; #define is_typec_altmode(_dev_) (_dev_->type == &typec_altmode_dev_type) diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h index 309251572e2e..c6fd46902fce 100644 --- a/include/linux/usb/typec.h +++ b/include/linux/usb/typec.h @@ -20,12 +20,15 @@ struct typec_port; struct typec_altmode_ops; struct typec_cable_ops; +struct bus_type; struct fwnode_handle; struct device; struct usb_power_delivery; struct usb_power_delivery_desc; +extern const struct bus_type typec_bus; + enum typec_port_type { TYPEC_PORT_SRC, TYPEC_PORT_SNK, thanks, -- heikki -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy