linux-kernel - [PATCH 2/2] thermal/of: Assume polling-delay(-passive) 0 when absent

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Date: Thu, 25 Jan 2024 13:11:16 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>, 
 Lukasz Luba <lukasz.luba@....com>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 2/2] thermal/of: Assume polling-delay(-passive) 0 when
 absent

Currently, thermal zones associated with providers that have interrupts
for signaling hot/critical trips are required to set a polling-delay
of 0 to indicate no polling. This feels a bit backwards.

Change the code such that "no polling delay" also means "no polling".

Suggested-by: Bjorn Andersson <andersson@...nel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/thermal/thermal_of.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 4d6c22e0ed85..61bbd42aa2cb 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -225,14 +225,18 @@ static int thermal_of_monitor_init(struct device_node *np, int *delay, int *pdel
 	int ret;

 	ret = of_property_read_u32(np, "polling-delay-passive", pdelay);
-	if (ret < 0) {
-		pr_err("%pOFn: missing polling-delay-passive property\n", np);
+	if (ret == -EINVAL) {
+		*pdelay = 0;
+	} else if (ret < 0) {
+		pr_err("%pOFn: Couldn't get polling-delay-passive: %d\n", np, ret);
 		return ret;
 	}

 	ret = of_property_read_u32(np, "polling-delay", delay);
-	if (ret < 0) {
-		pr_err("%pOFn: missing polling-delay property\n", np);
+	if (ret == -EINVAL) {
+		*delay = 0;
+	} else if (ret < 0) {
+		pr_err("%pOFn: Couldn't get polling-delay: %d\n", np, ret);
 		return ret;
 	}

-- 
2.40.1