From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f178.google.com (mail-pf1-f178.google.com [209.85.210.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 45653231C91 for ; Tue, 30 Dec 2025 18:25:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767119150; cv=none; b=E+IBIoU+fRRXLh1kxyLF4ILp7boROFTKohWTOE0hJ3+57giDoVRiWjCZMjEDjXC3V5YpJwaSpqZYBbT1fK0b4nJ3/VK2WXstH9ROEhsajJD/1QSQkeZe9D1dN/Q/P8u1T0ESyAJbuawi+1ze/EpfuXHQG5ZULVUY+k7Xy1Xejfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767119150; c=relaxed/simple; bh=xtaO4aAep/mnQs8q7Kd3W/+2UGJBHxvxH9CS/1w3fME=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=cNOvRAF5zOWATlZqZBnGmh0nzPN4MsYNAmeWASRHyPDfbiO/5a5I3k3SgON8hgTTtniN3kto7d3j1KYqkJUxmKZifoPwyRLv/VxkMtGTqZtnZOX4VKvXpU65JJdys1bpqrMBT2SdeACjomCkXhQeS/9ozCG3z9hXw4YhwUM151Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=RcHyOqK9; arc=none smtp.client-ip=209.85.210.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="RcHyOqK9" Received: by mail-pf1-f178.google.com with SMTP id d2e1a72fcca58-7f1243792f2so6823976b3a.1 for ; Tue, 30 Dec 2025 10:25:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1767119148; x=1767723948; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=ZqTUGT/buUVKhGmIbkmEN3zb8z3R3/y5Q/VjnKNHpcQ=; b=RcHyOqK9qRAYJB6ZHfxj1Tygdirpf4IW8A+b59SEttuAoY/4avh2TUAHf0TyGpaqMG LpeeczW54jAxOWLgK4LhNy3GtLTZz1fXEYHO7qtuHsf6bcpP1HXWjdLvVGMgC50DJSE2 MNL6ZFgjDBcy93WiS/53fveaCoqnfD97Wh0KL6X30FMwejaKJkcm5SY8HTDVdnMGvAbj Zq4gsln9lNMPvUnupVL/FNIYcMlQU8zESzW5Y41VHfYHNYioKXvDYjPv6BgnCqX+RoSj sPnwW4Y+V5NiMRZ/HqJiMTC+3AGKJiI+da/gaaTImlE2fFhdsjYrl/RjBKCiUlX2F5Op v66w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767119148; x=1767723948; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ZqTUGT/buUVKhGmIbkmEN3zb8z3R3/y5Q/VjnKNHpcQ=; b=tPU5Np2NGDynxmpQRClDxVjfl+GeeccimWJqtVAAj+gEqFMa7zRsifexJMcXE56fRV GteBFz3muRfEvGkB9kJU2sqnV01F/BlYNkieRNZCXkjYia21a948T9+OhrqxSB0/9wv2 ap9e5z0Q8fPSHYCOF5BT6erggwPB0ySMkXbiV+enmglKtRFTajjlJw+UBhWSwRE45eMb MsKZK7oYJ5spGwcregKcpcBV6CDtmJCNKiswzdr4po7OnnP0wB9TpCy7yWlmqktSRk1H lZoj0KbIfxpV01fRcRgz8qlO7vX9NgvaWrEVfwB7PC6VI/xzw9r03cZHPCvnhoIWXkdV haww== X-Gm-Message-State: AOJu0YxSIzsq5PraV4DlJeXxJu6PZMa0vsBRIezoXUErNsglYlgMJs8l 9vUtDzGgiZ77V2WzmOAPiiy1HK4suFfYfb1DeoNG6G0K6tISbS57AcaVeBQ+kmOH X-Gm-Gg: AY/fxX7StI2T6GPLKwXUq2SnFBLG2S+lZyJtG1mAHq9ifUUH5fy8qNwJQumEGADmawN Tkz1oijScNY4MJt6Yujpvs6JthY6t6epO7MHB5vh8sJKt8cxj3//F0Ph/NUT9h/iHpA/Orvd8u3 xLpe4uo0x2Ij/T6k6PJ/M0/GWOMDHvLafmA24MrpECnG4ci3eHN5UH7DfNCyuuKFNy15K6Vs6+E NW9/JpbZQ3Qc4WqlHOncIfgBUZMJQQEqiwkzQUGXzdpfwntu5GLN6lRh+NPxv+xx2h8etvHL/OO sVPWJrQp+6wjXD66IGZ3j0v6PocokAYGjLv48A4hUn9t4OctH50YliENlnhnaW7cHgU66ipIiys 6Ikls8JCpt18RWuyMdG0abZKnRuRBXh2QcFgajRPjiELla2vkJ7tsxtdiXsyfK3lypI4EuSx8WL /H32PTqWbtYAX+xr/kX+rCMsglpZS8P3EE/Hw2cILGJkAdZdbEA9mU9NsXC0eQxdF+CfHgzP0= X-Google-Smtp-Source: AGHT+IGUaoIo8GmOrRw+0+JNNNYx6MGrFKAD/C+kQiDMbpeIjuCOzqvoM6Ulwwvxs8WR6NAEOUUl0g== X-Received: by 2002:a05:6a20:6a07:b0:361:3bdc:916b with SMTP id adf61e73a8af0-376a75e78a3mr31725505637.7.1767119148344; Tue, 30 Dec 2025 10:25:48 -0800 (PST) Received: from ?IPV6:2601:1c0:5780:9200:d742:b62c:dcc9:47cd? ([2601:1c0:5780:9200:d742:b62c:dcc9:47cd]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a39018dc8bsm58720275ad.43.2025.12.30.10.25.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Dec 2025 10:25:48 -0800 (PST) Message-ID: Date: Tue, 30 Dec 2025 10:25:47 -0800 Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/4] fbdev: sh_mobile_lcdc: Make FB_DEVICE dependency optional To: Helge Deller Cc: linux-fbdev@vger.kernel.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org References: <20251230052827.4676-1-chintanlike@gmail.com> <20251230052827.4676-5-chintanlike@gmail.com> Content-Language: en-US From: Chintan Patel In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 12/30/25 00:13, Helge Deller wrote: > * Chintan Patel : >> The sh_mobile_lcdc driver exposes overlay configuration via sysfs, but the >> core driver does not require CONFIG_FB_DEVICE. >> >> Make sysfs support optional by defining overlay_sysfs_groups conditionally >> using PTR_IF(). The driver always sets .dev_groups, and the kernel >> naturally skips NULL attribute groups while the code remains buildable >> and type-checked. >> >> Suggested-by: Helge Deller >> Signed-off-by: Chintan Patel >> --- >> drivers/video/fbdev/sh_mobile_lcdcfb.c | 12 +++++++++++- >> 1 file changed, 11 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c >> index dd950e4ab5ce..cb7ed1ff9165 100644 >> --- a/drivers/video/fbdev/sh_mobile_lcdcfb.c >> +++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c >> @@ -1350,7 +1350,17 @@ static struct attribute *overlay_sysfs_attrs[] = { >> &dev_attr_overlay_rop3.attr, >> NULL, >> }; >> -ATTRIBUTE_GROUPS(overlay_sysfs); > > Instead of replacing the ^ ATTRIBUTE_GROUPS() by the code below, > isn't it possible to just mark the overlay_sysfs_attrs[] array > _maybe_unused, and just do: > + #ifdef CONFIG_FB_DEVICE > + ATTRIBUTE_GROUPS(overlay_sysfs); > + #endif > > ? Hi Helge, Yes, the __maybe_unused + #ifdef ATTRIBUTE_GROUPS() approach would work. I went with the PTR_IF(IS_ENABLED()) pattern because Andy suggested using PTR_IF() to conditionally include overlay_sysfs_group in overlay_sysfs_groups, and to keep .dev_groups always populated while letting the device core skip NULL groups. This avoids conditional wiring via #ifdef and keeps the code type-checked without CONFIG_FB_DEVICE. If you still prefer the simpler #ifdef ATTRIBUTE_GROUPS() approach for this driver, I can switch to that, but I wanted to follow Andy’s guidance here. Thanks!