linux-kernel - [PATCH v1 5/8] i2c: mlxbf: Refactor _UID handling to use acpi_dev_uid_to

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Date:   Wed,  7 Sep 2022 19:46:03 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        devel@...ica.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
        Elie Morisse <syniurge@...il.com>,
        Nehal Shah <nehal-bakulchandra.shah@....com>,
        Shyam Sundar S K <shyam-sundar.s-k@....com>,
        Khalil Blaiech <kblaiech@...dia.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Mark Brown <broonie@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Wolfram Sang <wsa@...nel.org>
Subject: [PATCH v1 5/8] i2c: mlxbf: Refactor _UID handling to use acpi_dev_uid_to_integer()

ACPI utils provide acpi_dev_uid_to_integer() helper to extract _UID as
an integer. Use it instead of custom approach.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/i2c/busses/i2c-mlxbf.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mlxbf.c b/drivers/i2c/busses/i2c-mlxbf.c
index 8716032f030a..4fd4b3799596 100644
--- a/drivers/i2c/busses/i2c-mlxbf.c
+++ b/drivers/i2c/busses/i2c-mlxbf.c
@@ -2230,34 +2230,27 @@ static int mlxbf_i2c_acpi_probe(struct device *dev, struct mlxbf_i2c_priv *priv)
 {
 	const struct acpi_device_id *aid;
 	struct acpi_device *adev;
-	unsigned long bus_id = 0;
-	const char *uid;
+	u64 bus_id;
 	int ret;
 
 	if (acpi_disabled)
 		return -ENOENT;
 
-	adev = ACPI_COMPANION(dev);
-	if (!adev)
-		return -ENXIO;
-
 	aid = acpi_match_device(mlxbf_i2c_acpi_ids, dev);
 	if (!aid)
 		return -ENODEV;
 
 	priv->chip = (struct mlxbf_i2c_chip_info *)aid->driver_data;
 
-	uid = acpi_device_uid(adev);
-	if (!uid || !(*uid)) {
+	ret = acpi_dev_uid_to_integer(adev, &bus_id);
+	if (ret) {
 		dev_err(dev, "Cannot retrieve UID\n");
-		return -ENODEV;
+		return ret;
 	}
 
-	ret = kstrtoul(uid, 0, &bus_id);
-	if (!ret)
-		priv->bus = bus_id;
+	priv->bus = bus_id;
 
-	return ret;
+	return 0;
 }
 #else
 static int mlxbf_i2c_acpi_probe(struct device *dev, struct mlxbf_i2c_priv *priv)
-- 
2.35.1