From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (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 777083F65F7 for ; Tue, 28 Apr 2026 13:53:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777384421; cv=none; b=ZHiUIPGNhiBgjdXMhL2InyghPHO4dOHjiLipWY7jRahw8JMDZAhI/i7db+9vqryz79OGjQzA37Dm7bVOmpGXGH/+JN1Mi79Mr7Hdv5qlCa4Y8lv/pgihRYI+4EElshBeVjj7t1uDUWDb4fi/OPDh/eqNmrI9QXG3WLHVkbL23+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777384421; c=relaxed/simple; bh=P1TtYXgpOugxsrsi4TZ8sU0ijVvGzlNUg4vJzN9+UrU=; h=Mime-Version:Content-Type:Date:Message-Id:Cc:To:From:Subject: References:In-Reply-To; b=Boe50SWs0M0J4F7bOWhA1XbsXtGo6Ak7unoZH4Ve8yY4tQAPMPDwaSNxZbVY3FA2+pzMU3keuy+R8BvJU+RmGe4jpZZt8OJ2Jnxgka+K2jc541P0pHrGsZEXl61A24Ge6GcGzIsFkL6XnnR4SUIasHIRkJmLHhXe53jJR5aGiak= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=1b2DowR6; arc=none smtp.client-ip=185.246.84.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="1b2DowR6" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id E09C01A3453; Tue, 28 Apr 2026 13:53:37 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id A090F601D0; Tue, 28 Apr 2026 13:53:37 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 7C28410728C3C; Tue, 28 Apr 2026 15:53:28 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1777384416; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=mi11yIAKIeUtq1BstSRzJLBfPBpY7CpkArje5as7Flw=; b=1b2DowR6+l483OumXJsOi9RuRKuwGfgpP6qQ9aP93gJb5bkBB1iEofOoFTFpEBHvtAg1aC F52wa8jZJxXmACT+s6pZgeAvRJ3ASqE/KD7AyBIjIJKJncz0iR2cmdWCPHeW/68USn6Tu6 iyEwwGmUJOHPiVWnygRdTuir3lf1vlWx0nqNbrv2gZtGZNu7A7tw4fj5HQo/8sVFRhXiFR 0pzr9osvlwr7UXb5yPlWgWdIBvcNbZVrO96eayX7rpZGKYHCyZJeo1rXvCEvIFnkmV+bzo o4aGLUXTsuXGJIh395YwzezFbNnKhSwdfTwTjpt8VohTmRU5TFN0NRH3y39nwQ== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; 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 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