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[61.220.246.151]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82d11f76c09sm18807603b3a.55.2026.04.09.00.21.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Apr 2026 00:21:33 -0700 (PDT) From: David Wang To: a.zummo@towertech.it, alexandre.belloni@bootlin.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: andrew@aj.id.au, avi.fishman@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, ctcchien@nuvoton.com, mimi05633@gmail.com, openbmc@lists.ozlabs.org, linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, davidwang@quantatw.com, David Wang Subject: [PATCH 2/2] rtc: nct3018y: add optional control register initialization Date: Thu, 9 Apr 2026 15:21:05 +0800 Message-Id: <65d40ded5afd87d0dbdcf98652a97e4ad244505c.1775717959.git.tomato1220@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Support the "nuvoton,ctrl-reg-val" Device Tree property to initialize the RTC control register (0x0A) during the probe phase. This provides flexibility for different platforms to override default hardware settings. Signed-off-by: David Wang --- drivers/rtc/rtc-nct3018y.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/rtc/rtc-nct3018y.c b/drivers/rtc/rtc-nct3018y.c index cd4b1db902e9..4bc47b4ac935 100644 --- a/drivers/rtc/rtc-nct3018y.c +++ b/drivers/rtc/rtc-nct3018y.c @@ -534,6 +534,15 @@ static int nct3018y_probe(struct i2c_client *client) } } + if (!of_property_read_u32(client->dev.of_node, "nuvoton,ctrl-reg-val", &flags)) { + + err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, (u8)flags); + if (err < 0) { + dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL.\n"); + return err; + } + } + flags = 0; err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_ST, flags); if (err < 0) { -- 2.34.1