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([2601:1c0:5780:9200:a91e:86e3:6d78:53d4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7ff7e797aadsm25834180b3a.61.2025.12.27.19.36.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 27 Dec 2025 19:36:03 -0800 (PST) Message-ID: Date: Sat, 27 Dec 2025 19:36:03 -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 v2 2/4] staging: fbtft: Make FB_DEVICE dependency optional To: Andy Shevchenko Cc: linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, tzimmermann@suse.de, andy@kernel.org, deller@gmx.de, gregkh@linuxfoundation.org References: <20251219054320.447281-1-chintanlike@gmail.com> <20251219054320.447281-3-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 Hi Andy, On 12/27/25 06:19, Andy Shevchenko wrote: > On Fri, Dec 19, 2025 at 7:43 AM Chintan Patel wrote: >> >> fbtft provides sysfs interfaces for debugging and gamma configuration, >> but these are not required for the core driver. >> >> Drop the hard dependency on CONFIG_FB_DEVICE and make sysfs support >> optional by using dev_of_fbinfo() at runtime. When FB_DEVICE is disabled, >> sysfs operations are skipped while the code remains buildable and >> type-checked. > >> v2: >> - Replace CONFIG_FB_DEVICE ifdefs with runtime checks >> - Use dev_of_fbinfo() to guard sysfs creation and removal > > The place for the change log is either a cover letter, or... > >> Suggested-by: Thomas Zimmermann >> Suggested-by: Helge Deller >> Signed-off-by: Chintan Patel >> --- > > ...a comment block here. It's not so important to be in the Git > history since we have a lore.kernel.org archive. Thank you for suggestion! Will move to coverletter. >> drivers/staging/fbtft/Kconfig | 5 ++++- >> drivers/staging/fbtft/fbtft-sysfs.c | 18 ++++++++++++++---- > > ... > >> void fbtft_sysfs_init(struct fbtft_par *par) >> { >> - device_create_file(par->info->dev, &debug_device_attr); >> + struct device *dev = dev_of_fbinfo(par->info); >> + >> + if (!dev) >> + return; > > > The better way is to decouple the definition and the assignment in the > cases when it's followed by a conditional (validation check). In this > case any new code added in between doesn't affect readability and > maintenance efforts. > > struct device *dev; > > dev = dev_of_fbinfo(par->info); > if (!dev) > return; > >> + device_create_file(dev, &debug_device_attr); >> if (par->gamma.curves && par->fbtftops.set_gamma) >> - device_create_file(par->info->dev, &gamma_device_attrs[0]); >> + device_create_file(dev, &gamma_device_attrs[0]); >> } > > Ditto for the rest. Will do v3 and re-send. Thanks for reviews!