From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heikki Krogerus Subject: Re: [PATCH v5 4/6] usb: roles: add API to get usb_role_switch by node Date: Mon, 20 May 2019 11:36:01 +0300 Message-ID: <20190520083601.GE1887@kuha.fi.intel.com> References: <1557823643-8616-1-git-send-email-chunfeng.yun@mediatek.com> <1557823643-8616-5-git-send-email-chunfeng.yun@mediatek.com> <20190517103736.GA1490@kuha.fi.intel.com> <20190517130511.GA1887@kuha.fi.intel.com> <1558319951.10179.352.camel@mhfsdcap03> <20190520080359.GC1887@kuha.fi.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Biju Das Cc: Chunfeng Yun , Rob Herring , Greg Kroah-Hartman , Mark Rutland , Matthias Brugger , Adam Thomson , Li Jun , Badhri Jagan Sridharan , Hans de Goede , Andy Shevchenko , Min Guo , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-usb@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mediatek@lists.infradead.org" List-Id: devicetree@vger.kernel.org On Mon, May 20, 2019 at 08:06:41AM +0000, Biju Das wrote: > Hi Heikki, > > > -----Original Message----- > > From: Heikki Krogerus > > Sent: Monday, May 20, 2019 9:04 AM > > To: Chunfeng Yun > > Cc: Rob Herring ; Greg Kroah-Hartman > > ; Mark Rutland ; > > Matthias Brugger ; Adam Thomson > > ; Li Jun ; > > Badhri Jagan Sridharan ; Hans de Goede > > ; Andy Shevchenko > > ; Min Guo ; > > devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; linux- > > usb@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux- > > mediatek@lists.infradead.org; Biju Das ; Linus > > Walleij > > Subject: Re: [PATCH v5 4/6] usb: roles: add API to get usb_role_switch by > > node > > > > On Mon, May 20, 2019 at 10:39:11AM +0800, Chunfeng Yun wrote: > > > Hi, > > > On Fri, 2019-05-17 at 16:05 +0300, Heikki Krogerus wrote: > > > > Hi, > > > > > > > > On Fri, May 17, 2019 at 01:37:36PM +0300, Heikki Krogerus wrote: > > > > > On Tue, May 14, 2019 at 04:47:21PM +0800, Chunfeng Yun wrote: > > > > > > Add fwnode_usb_role_switch_get() to make easier to get > > > > > > usb_role_switch by fwnode which register it. > > > > > > It's useful when there is not device_connection registered > > > > > > between two drivers and only knows the fwnode which register > > > > > > usb_role_switch. > > > > > > > > > > > > Signed-off-by: Chunfeng Yun > > > > > > Tested-by: Biju Das > > > > > > > > > > Acked-by: Heikki Krogerus > > > > > > > > Hold on. I just noticed Rob's comment on patch 2/6, where he points > > > > out that you don't need to use device graph since the controller is > > > > the parent of the connector. Doesn't that mean you don't really need > > > > this API? > > > No, I still need it. > > > The change is about the way how to get fwnode; when use device graph, > > > get fwnode by of_graph_get_remote_node(); but now will get fwnode by > > > of_get_parent(); > > > > OK, I get that, but I'm still not convinced about if something like this function > > is needed at all. I also have concerns regarding how you are using the > > function. I'll explain in comment to the patch 5/6 in this series... > > FYI, Currently I am also using this api in my patch series. > https://patchwork.kernel.org/patch/10944637/ Yes, and I have the same question for you I jusb asked in comment I added to the patch 5/6 of this series. Why isn't usb_role_switch_get() enough? thanks, -- heikki