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(61-220-246-151.hinet-ip.hinet.net. [61.220.246.151]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cb258eb856dsm1891644a12.6.2026.07.16.05.51.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2026 05:51:43 -0700 (PDT) From: Cosmo Chou To: alexandre.belloni@bootlin.com Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, cosmo.chou@quantatw.com, Cosmo Chou Subject: [PATCH] rtc: pcf85363: Fix phantom device registration on missing hardware Date: Thu, 16 Jul 2026 20:51:42 +0800 Message-ID: <20260716125142.1801599-1-chou.cosmo@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit During probe, pcf85363_load_capacitance() writes the oscillator load capacitance configuration to the device. However, if the device is not physically present on the bus (returning -ENXIO), the driver only emits a warning and continues to execute the probe. This results in the successful registration of a phantom RTC device via devm_rtc_register_device() and its associated nvmem regions. Consequently, userspace may attempt to bind to a non-functional /dev/rtc node. Propagate the I2C error back to the driver core using dev_err_probe() to properly abort the probe and prevent phantom device registration. Fixes: fd9a6a13949a ("rtc: pcf85363: add support for the quartz-load-femtofarads property") Signed-off-by: Cosmo Chou --- drivers/rtc/rtc-pcf85363.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c index 540042b9eec8..5612330aff40 100644 --- a/drivers/rtc/rtc-pcf85363.c +++ b/drivers/rtc/rtc-pcf85363.c @@ -426,8 +426,8 @@ static int pcf85363_probe(struct i2c_client *client) err = pcf85363_load_capacitance(pcf85363, client->dev.of_node); if (err < 0) - dev_warn(&client->dev, "failed to set xtal load capacitance: %d", - err); + return dev_err_probe(&client->dev, err, + "failed to set xtal load capacitance\n"); pcf85363->rtc->ops = &rtc_ops; pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; -- 2.43.0