From:   Rob Herring <robh@kernel.org>
To:     Michael Ellerman <mpe@ellerman.id.au>,
        Nicholas Piggin <npiggin@gmail.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Arnd Bergmann <arnd@arndb.de>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc:     devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] powerpc: Use of_property_present() for testing DT property presence
Date:   Fri, 10 Mar 2023 08:46:56 -0600
Message-Id: <20230310144657.1541039-1-robh@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@kernel.org>
---
 arch/powerpc/kernel/legacy_serial.c          | 8 ++++----
 arch/powerpc/platforms/44x/iss4xx.c          | 2 +-
 arch/powerpc/platforms/44x/ppc476.c          | 2 +-
 arch/powerpc/platforms/4xx/pci.c             | 2 +-
 arch/powerpc/platforms/cell/spu_manage.c     | 2 +-
 arch/powerpc/platforms/powermac/pic.c        | 2 +-
 arch/powerpc/platforms/powernv/opal-lpc.c    | 2 +-
 arch/powerpc/platforms/pseries/hotplug-cpu.c | 2 +-
 arch/powerpc/platforms/pseries/vio.c         | 2 +-
 arch/powerpc/sysdev/mpic_msgr.c              | 2 +-
 10 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index f048c424c525..1a3b7f3513b4 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -171,11 +171,11 @@ static int __init add_legacy_soc_port(struct device_node *np,
 	/* We only support ports that have a clock frequency properly
 	 * encoded in the device-tree.
 	 */
-	if (of_get_property(np, "clock-frequency", NULL) == NULL)
+	if (!of_property_present(np, "clock-frequency"))
 		return -1;
 
 	/* if reg-offset don't try to use it */
-	if ((of_get_property(np, "reg-offset", NULL) != NULL))
+	if (of_property_present(np, "reg-offset"))
 		return -1;
 
 	/* if rtas uses this device, don't try to use it as well */
@@ -237,7 +237,7 @@ static int __init add_legacy_isa_port(struct device_node *np,
 	 * Note: Don't even try on P8 lpc, we know it's not directly mapped
 	 */
 	if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
-	    of_get_property(isa_brg, "ranges", NULL)) {
+	    of_property_present(isa_brg, "ranges")) {
 		taddr = of_translate_address(np, reg);
 		if (taddr == OF_BAD_ADDR)
 			taddr = 0;
@@ -268,7 +268,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
 	 * compatible UARTs on PCI need all sort of quirks (port offsets
 	 * etc...) that this code doesn't know about
 	 */
-	if (of_get_property(np, "clock-frequency", NULL) == NULL)
+	if (!of_property_present(np, "clock-frequency"))
 		return -1;
 
 	/* Get the PCI address. Assume BAR 0 */
diff --git a/arch/powerpc/platforms/44x/iss4xx.c b/arch/powerpc/platforms/44x/iss4xx.c
index c5f82591408c..812765cf0632 100644
--- a/arch/powerpc/platforms/44x/iss4xx.c
+++ b/arch/powerpc/platforms/44x/iss4xx.c
@@ -52,7 +52,7 @@ static void __init iss4xx_init_irq(void)
 
 	/* Find top level interrupt controller */
 	for_each_node_with_property(np, "interrupt-controller") {
-		if (of_get_property(np, "interrupts", NULL) == NULL)
+		if (!of_property_present(np, "interrupts"))
 			break;
 	}
 	if (np == NULL)
diff --git a/arch/powerpc/platforms/44x/ppc476.c b/arch/powerpc/platforms/44x/ppc476.c
index 7c91ac5a5241..70556fd10f6b 100644
--- a/arch/powerpc/platforms/44x/ppc476.c
+++ b/arch/powerpc/platforms/44x/ppc476.c
@@ -122,7 +122,7 @@ static void __init ppc47x_init_irq(void)
 
 	/* Find top level interrupt controller */
 	for_each_node_with_property(np, "interrupt-controller") {
-		if (of_get_property(np, "interrupts", NULL) == NULL)
+		if (!of_property_present(np, "interrupts"))
 			break;
 	}
 	if (np == NULL)
diff --git a/arch/powerpc/platforms/4xx/pci.c b/arch/powerpc/platforms/4xx/pci.c
index ca5dd7a5842a..70a055f76e5a 100644
--- a/arch/powerpc/platforms/4xx/pci.c
+++ b/arch/powerpc/platforms/4xx/pci.c
@@ -348,7 +348,7 @@ static void __init ppc4xx_probe_pci_bridge(struct device_node *np)
 	}
 
 	/* Check if primary bridge */
-	if (of_get_property(np, "primary", NULL))
+	if (of_property_present(np, "primary"))
 		primary = 1;
 
 	/* Get bus range if any */
diff --git a/arch/powerpc/platforms/cell/spu_manage.c b/arch/powerpc/platforms/cell/spu_manage.c
index f1ac4c742069..74567b32c48c 100644
--- a/arch/powerpc/platforms/cell/spu_manage.c
+++ b/arch/powerpc/platforms/cell/spu_manage.c
@@ -402,7 +402,7 @@ static int __init of_has_vicinity(void)
 	struct device_node *dn;
 
 	for_each_node_by_type(dn, "spe") {
-		if (of_find_property(dn, "vicinity", NULL))  {
+		if (of_property_present(dn, "vicinity"))  {
 			of_node_put(dn);
 			return 1;
 		}
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index 8c8d8e0a7d13..3425065ab22e 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -476,7 +476,7 @@ static int __init pmac_pic_probe_mpic(void)
 	/* We can have up to 2 MPICs cascaded */
 	for_each_node_by_type(np, "open-pic") {
 		if (master == NULL &&
-		    of_get_property(np, "interrupts", NULL) == NULL)
+		    !of_property_present(np, "interrupts"))
 			master = of_node_get(np);
 		else if (slave == NULL)
 			slave = of_node_get(np);
diff --git a/arch/powerpc/platforms/powernv/opal-lpc.c b/arch/powerpc/platforms/powernv/opal-lpc.c
index d129d6d45a50..a16f07cdab26 100644
--- a/arch/powerpc/platforms/powernv/opal-lpc.c
+++ b/arch/powerpc/platforms/powernv/opal-lpc.c
@@ -403,7 +403,7 @@ void __init opal_lpc_init(void)
 		return;
 
 	/* Does it support direct mapping ? */
-	if (of_get_property(np, "ranges", NULL)) {
+	if (of_property_present(np, "ranges")) {
 		pr_info("OPAL: Found memory mapped LPC bus on chip %d\n",
 			opal_lpc_chip_id);
 		isa_bridge_init_non_pci(np);
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 982e5e4b5e06..1a3cb313976a 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -493,7 +493,7 @@ static bool valid_cpu_drc_index(struct device_node *parent, u32 drc_index)
 	bool found = false;
 	int rc, index;
 
-	if (of_find_property(parent, "ibm,drc-info", NULL))
+	if (of_property_present(parent, "ibm,drc-info"))
 		return drc_info_valid_index(parent, drc_index);
 
 	/* Note that the format of the ibm,drc-indexes array is
diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index 770df9351aaa..d54306a936d5 100644
--- a/arch/powerpc/platforms/pseries/vio.c
+++ b/arch/powerpc/platforms/pseries/vio.c
@@ -1440,7 +1440,7 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
 	viodev->dev.bus = &vio_bus_type;
 	viodev->dev.release = vio_dev_release;
 
-	if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
+	if (of_property_present(viodev->dev.of_node, "ibm,my-dma-window")) {
 		if (firmware_has_feature(FW_FEATURE_CMO))
 			vio_cmo_set_dma_ops(viodev);
 		else
diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
index d75064fb7d12..1a3ac0b5dd89 100644
--- a/arch/powerpc/sysdev/mpic_msgr.c
+++ b/arch/powerpc/sysdev/mpic_msgr.c
@@ -116,7 +116,7 @@ static unsigned int mpic_msgr_number_of_blocks(void)
 
 		for (;;) {
 			snprintf(buf, sizeof(buf), "mpic-msgr-block%d", count);
-			if (!of_find_property(aliases, buf, NULL))
+			if (!of_property_present(aliases, buf))
 				break;
 
 			count += 1;
-- 
2.39.2