[PATCH] serial: Use of_property_present() for testing DT property presence

[Rob Herring]

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 at kernel.org>
---
 drivers/tty/serial/imx.c      | 3 +--
 drivers/tty/serial/sh-sci.c   | 2 +-
 drivers/tty/serial/sunzilog.c | 4 ++--
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 523f296d5747..5712a4f29607 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -2269,8 +2269,7 @@ static int imx_uart_probe(struct platform_device *pdev)
 	if (of_get_property(np, "fsl,dte-mode", NULL))
 		sport->dte_mode = 1;
 
-	if (of_get_property(np, "rts-gpios", NULL))
-		sport->have_rtsgpio = 1;
+	sport->have_rtsgpio = of_property_present(np, "rts-gpios");
 
 	if (of_get_property(np, "fsl,inverted-tx", NULL))
 		sport->inverted_tx = 1;
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 7bd080720929..a3e12e985e0d 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1573,7 +1573,7 @@ static void sci_request_dma(struct uart_port *port)
 	 * Don't request a dma channel if no channel was specified
 	 * in the device tree.
 	 */
-	if (!of_find_property(port->dev->of_node, "dmas", NULL))
+	if (!of_property_present(port->dev->of_node, "dmas"))
 		return;
 
 	chan = sci_request_dma_chan(port, DMA_MEM_TO_DEV);
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index ccb809216e94..0fbeb3dbd843 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -1403,7 +1403,7 @@ static int zs_probe(struct platform_device *op)
 	int keyboard_mouse = 0;
 	int err;
 
-	if (of_find_property(op->dev.of_node, "keyboard", NULL))
+	if (of_property_present(op->dev.of_node, "keyboard"))
 		keyboard_mouse = 1;
 
 	/* uarts must come before keyboards/mice */
@@ -1553,7 +1553,7 @@ static int __init sunzilog_init(void)
 
 	for_each_node_by_name(dp, "zs") {
 		num_sunzilog++;
-		if (of_find_property(dp, "keyboard", NULL))
+		if (of_property_present(dp, "keyboard"))
 			num_keybms++;
 	}
 
-- 
2.39.2