linux-kernel - [PATCH] mfd: Use of_property_present() for testing DT property presence

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Date:   Fri, 10 Mar 2023 08:47:12 -0600
From:   Rob Herring <robh@...nel.org>
To:     Lee Jones <lee@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc:     devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH] mfd: Use of_property_present() for testing DT property presence

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.

Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/mfd/bcm2835-pm.c | 2 +-
 drivers/mfd/khadas-mcu.c | 2 +-
 drivers/mfd/stmpe.c      | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/bcm2835-pm.c b/drivers/mfd/bcm2835-pm.c
index 49cd1f03884a..aa1263d22249 100644
--- a/drivers/mfd/bcm2835-pm.c
+++ b/drivers/mfd/bcm2835-pm.c
@@ -28,7 +28,7 @@ static const struct mfd_cell bcm2835_power_devs[] = {
 static int bcm2835_pm_get_pdata(struct platform_device *pdev,
 				struct bcm2835_pm *pm)
 {
-	if (of_find_property(pm->dev->of_node, "reg-names", NULL)) {
+	if (of_property_present(pm->dev->of_node, "reg-names")) {
 		struct resource *res;
 
 		pm->base = devm_platform_ioremap_resource_byname(pdev, "pm");
diff --git a/drivers/mfd/khadas-mcu.c b/drivers/mfd/khadas-mcu.c
index 7338cc16f327..1c807c0e6d25 100644
--- a/drivers/mfd/khadas-mcu.c
+++ b/drivers/mfd/khadas-mcu.c
@@ -112,7 +112,7 @@ static int khadas_mcu_probe(struct i2c_client *client)
 	if (ret)
 		return ret;
 
-	if (of_find_property(dev->of_node, "#cooling-cells", NULL))
+	if (of_property_present(dev->of_node, "#cooling-cells"))
 		return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
 					    khadas_mcu_fan_cells,
 					    ARRAY_SIZE(khadas_mcu_fan_cells),
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index c304d20bb988..a92301dfc712 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1378,7 +1378,7 @@ int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
 
 	stmpe_of_probe(pdata, np);
 
-	if (of_find_property(np, "interrupts", NULL) == NULL)
+	if (!of_property_present(np, "interrupts"))
 		ci->irq = -1;
 
 	stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
-- 
2.39.2