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charset=UTF-8 Date: Tue, 28 Apr 2026 15:53:27 +0200 Message-Id: Cc: "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "David Airlie" , "Simona Vetter" , "Rob Clark" , "Dmitry Baryshkov" , "Abhinav Kumar" , "Jessica Zhang" , "Sean Paul" , "Marijn Suijten" , "Tian Tao" , "Xinwei Kong" , "Sumit Semwal" , "John Stultz" , "Andrzej Hajda" , "Neil Armstrong" , "Robert Foss" , "Laurent Pinchart" , "Jonas Karlman" , "Jernej Skrabec" , "Tomi Valkeinen" , "Michal Simek" , "Hui Pu" , "Ian Ray" , "Thomas Petazzoni" , , , , , To: "Gyeyoung Baek" From: "Luca Ceresoli" Subject: Re: [PATCH v2 07/11] drm/bridge: lt9611: switch to of_drm_get_bridge_by_endpoint() X-Mailer: aerc 0.20.1 References: <20260428-drm-bridge-alloc-getput-panel_or_bridge-v2-0-4300744a1c47@bootlin.com> <20260428-drm-bridge-alloc-getput-panel_or_bridge-v2-7-4300744a1c47@bootlin.com> In-Reply-To: X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260428_145339_818006_96610F70 X-CRM114-Status: GOOD ( 11.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue Apr 28, 2026 at 3:18 PM CEST, Gyeyoung Baek wrote: >> >> @@ -1058,7 +1057,11 @@ static int lt9611_parse_dt(struct device *dev, >> >> lt9611->ac_mode =3D of_property_read_bool(dev->of_node, "lt,ac-m= ode"); >> >> - return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, &l= t9611->next_bridge); >> + lt9611->bridge.next_bridge =3D of_drm_get_bridge_by_endpoint(dev= ->of_node, 2, -1); >> + if (IS_ERR(lt9611->bridge.next_bridge)) >> + return PTR_ERR(lt9611->bridge.next_bridge); >> + >> + return 0; >> } > > Hello Luca, > Could you take a look at this alternative? > ------ > struct drm_bridge *next_bridge =3D > of_drm_get_bridge_by_endpoint(dev->of_node, 2, -1); > > if (IS_ERR(next_bridge)) > return PTR_ERR(next_bridge); > > lt9611->bridge.next_bridge =3D next_bridge; > return 0; > ------ > > I think it reads a bit cleaner and avoids holding the ERR_PTR in the str= uct. Yes, but more verbose. Based on this and the patch 8 fallback reported by Biju, I started wondering whether the v1 version of this function, while being a bit ugly, was leading to cleaner code... An example: [0]. Dmitry, your opinion? [0] https://lore.kernel.org/all/20260413-drm-bridge-alloc-getput-panel_or_b= ridge-v1-6-acd01cd79a1f@bootlin.com/ Luca -- Luca Ceresoli, Bootlin Embedded Linux and Kernel engineering https://bootlin.com