linux-kernel - [PATCH] backlight: ktz8866: Correct the check for of_property_read

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Date: Mon, 29 Jan 2024 20:28:29 +0800
From: Jianhua Lu <lujianhua000@...il.com>
To: Jianhua Lu <lujianhua000@...il.com>,
	Lee Jones <lee@...nel.org>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Jingoo Han <jingoohan1@...il.com>,
	Helge Deller <deller@....de>
Cc: dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] backlight: ktz8866: Correct the check for of_property_read_u32

of_property_read_u32 returns 0 when success, so reverse the
return value to get the true value.

Fixes: f8449c8f7355 ("backlight: ktz8866: Add support for Kinetic KTZ8866 backlight")
Signed-off-by: Jianhua Lu <lujianhua000@...il.com>
---
 drivers/video/backlight/ktz8866.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/video/backlight/ktz8866.c b/drivers/video/backlight/ktz8866.c
index 9c980f2571ee..014877b5a984 100644
--- a/drivers/video/backlight/ktz8866.c
+++ b/drivers/video/backlight/ktz8866.c
@@ -97,20 +97,20 @@ static void ktz8866_init(struct ktz8866 *ktz)
 {
 	unsigned int val = 0;
 
-	if (of_property_read_u32(ktz->client->dev.of_node, "current-num-sinks", &val))
+	if (!of_property_read_u32(ktz->client->dev.of_node, "current-num-sinks", &val))
 		ktz8866_write(ktz, BL_EN, BIT(val) - 1);
 	else
 		/* Enable all 6 current sinks if the number of current sinks isn't specified. */
 		ktz8866_write(ktz, BL_EN, BIT(6) - 1);
 
-	if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,current-ramp-delay-ms", &val)) {
+	if (!of_property_read_u32(ktz->client->dev.of_node, "kinetic,current-ramp-delay-ms", &val)) {
 		if (val <= 128)
 			ktz8866_write(ktz, BL_CFG2, BIT(7) | (ilog2(val) << 3) | PWM_HYST);
 		else
 			ktz8866_write(ktz, BL_CFG2, BIT(7) | ((5 + val / 64) << 3) | PWM_HYST);
 	}
 
-	if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,led-enable-ramp-delay-ms", &val)) {
+	if (!of_property_read_u32(ktz->client->dev.of_node, "kinetic,led-enable-ramp-delay-ms", &val)) {
 		if (val == 0)
 			ktz8866_write(ktz, BL_DIMMING, 0);
 		else {
-- 
2.43.0